diff mbox series

[RFC,RESEND,2/3] media: uapi: Add VP9 stateless decoder controls

Message ID 20210421100035.13571-3-andrzej.p@collabora.com (mailing list archive)
State New
Headers show
Series vp9 v4l2 stateless uapi | expand

Commit Message

Andrzej Pietrasiewicz April 21, 2021, 10 a.m. UTC
Add the VP9 stateless decoder controls plus the documentation that goes
with it.

Signed-off-by: Boris Brezillon <boris.brezillon@collabora.com>
Signed-off-by: Ezequiel Garcia <ezequiel@collabora.com>
Signed-off-by: Adrian Ratiu <adrian.ratiu@collabora.com>
Signed-off-by: Andrzej Pietrasiewicz <andrzej.p@collabora.com>
---
 .../userspace-api/media/v4l/biblio.rst        |  10 +
 .../media/v4l/ext-ctrls-codec-stateless.rst   | 523 ++++++++++++++++++
 .../media/v4l/pixfmt-compressed.rst           |  15 +
 .../media/v4l/vidioc-g-ext-ctrls.rst          |   8 +
 .../media/v4l/vidioc-queryctrl.rst            |  12 +
 .../media/videodev2.h.rst.exceptions          |   2 +
 drivers/media/v4l2-core/v4l2-ctrls.c          | 244 ++++++++
 drivers/media/v4l2-core/v4l2-ioctl.c          |   1 +
 include/media/v4l2-ctrls.h                    |   4 +
 include/uapi/linux/v4l2-controls.h            | 455 +++++++++++++++
 include/uapi/linux/videodev2.h                |   6 +
 11 files changed, 1280 insertions(+)

Comments

Hans Verkuil April 29, 2021, 10:20 a.m. UTC | #1
On 21/04/2021 12:00, Andrzej Pietrasiewicz wrote:
> Add the VP9 stateless decoder controls plus the documentation that goes
> with it.
> 
> Signed-off-by: Boris Brezillon <boris.brezillon@collabora.com>
> Signed-off-by: Ezequiel Garcia <ezequiel@collabora.com>
> Signed-off-by: Adrian Ratiu <adrian.ratiu@collabora.com>
> Signed-off-by: Andrzej Pietrasiewicz <andrzej.p@collabora.com>
> ---
>  .../userspace-api/media/v4l/biblio.rst        |  10 +
>  .../media/v4l/ext-ctrls-codec-stateless.rst   | 523 ++++++++++++++++++
>  .../media/v4l/pixfmt-compressed.rst           |  15 +
>  .../media/v4l/vidioc-g-ext-ctrls.rst          |   8 +
>  .../media/v4l/vidioc-queryctrl.rst            |  12 +
>  .../media/videodev2.h.rst.exceptions          |   2 +
>  drivers/media/v4l2-core/v4l2-ctrls.c          | 244 ++++++++
>  drivers/media/v4l2-core/v4l2-ioctl.c          |   1 +
>  include/media/v4l2-ctrls.h                    |   4 +
>  include/uapi/linux/v4l2-controls.h            | 455 +++++++++++++++
>  include/uapi/linux/videodev2.h                |   6 +
>  11 files changed, 1280 insertions(+)
> 
> diff --git a/Documentation/userspace-api/media/v4l/biblio.rst b/Documentation/userspace-api/media/v4l/biblio.rst
> index 64d241daf63c..051982896375 100644
> --- a/Documentation/userspace-api/media/v4l/biblio.rst
> +++ b/Documentation/userspace-api/media/v4l/biblio.rst
> @@ -417,3 +417,13 @@ VP8
>  :title:     RFC 6386: "VP8 Data Format and Decoding Guide"
>  
>  :author:    J. Bankoski et al.
> +
> +.. _vp9:
> +
> +VP9
> +===
> +
> +
> +:title:     VP9 Bitstream & Decoding Process Specification
> +
> +:author:    Adrian Grange (Google), Peter de Rivaz (Argon Design), Jonathan Hunt (Argon Design)
> diff --git a/Documentation/userspace-api/media/v4l/ext-ctrls-codec-stateless.rst b/Documentation/userspace-api/media/v4l/ext-ctrls-codec-stateless.rst
> index 3fc04daa9ffb..ab40c878c8ad 100644
> --- a/Documentation/userspace-api/media/v4l/ext-ctrls-codec-stateless.rst
> +++ b/Documentation/userspace-api/media/v4l/ext-ctrls-codec-stateless.rst
> @@ -1244,3 +1244,526 @@ FWHT Flags
>      * - __u8
>        - ``padding[3]``
>        - Applications and drivers must set this to zero.
> +
> +.. _v4l2-codec-stateless-vp9:
> +
> +``V4L2_CID_STATELESS_VP9_COMPRESSED_HDR_PROBS (struct)``
> +    Stores VP9 probabilities updates as parsed from the current compressed frame
> +    header. A value of zero in a struct member means no update of the relevant
> +    probability. Motion vector-related updates contain a new value or zero. All
> +    other updates contain values translated with inv_map_table[] (see 6.3.5 in
> +    :ref:`vp9`).
> +
> +.. c:type:: v4l2_ctrl_vp9_compressed_hdr_probs
> +
> +.. cssclass:: longtable
> +
> +.. tabularcolumns:: |p{5.8cm}|p{4.8cm}|p{6.6cm}|
> +
> +.. flat-table:: struct v4l2_ctrl_vp9_compressed_hdr_probs
> +    :header-rows:  0
> +    :stub-columns: 0
> +    :widths:       1 1 2
> +
> +    * - __u8
> +      - ``tx8[2][1]``
> +      - TX 8x8 probabilities delta.
> +    * - __u8
> +      - ``tx16[2][2]``
> +      - TX 16x16 probabilities delta.
> +    * - __u8
> +      - ``tx32[2][3]``
> +      - TX 32x32 probabilities delta.
> +    * - __u8
> +      - ``coef[4][2][2][6][6][3]``
> +      - Coefficient probabilities delta.
> +    * - __u8
> +      - ``skip[3]``
> +      - Skip probabilities delta.
> +    * - __u8
> +      - ``inter_mode[7][3]``
> +      - Inter prediction mode probabilities delta.
> +    * - __u8
> +      - ``interp_filter[4][2]``
> +      - Interpolation filter probabilities delta.
> +    * - __u8
> +      - ``is_inter[4]``
> +      - Is inter-block probabilities delta.
> +    * - __u8
> +      - ``comp_mode[5]``
> +      - Compound prediction mode probabilities delta.
> +    * - __u8
> +      - ``single_ref[5][2]``
> +      - Single reference probabilities delta.
> +    * - __u8
> +      - ``comp_mode[5]``
> +      - Compound reference probabilities delta.
> +    * - __u8
> +      - ``y_mode[4][9]``
> +      - Y prediction mode probabilities delta.
> +    * - __u8
> +      - ``uv_mode[10][9]``
> +      - UV prediction mode probabilities delta.
> +    * - __u8
> +      - ``partition[16][3]``
> +      - Partition probabilities delta.
> +    * - __u8
> +      - ``partition[16][3]``
> +      - Partition probabilities delta.
> +    * - __u8
> +      - ``mv.joint[3]``
> +      - Motion vector joint probabilities delta.
> +    * - __u8
> +      - ``mv.sign[2]``
> +      - Motion vector sign probabilities delta.
> +    * - __u8
> +      - ``mv.class[2][10]``
> +      - Motion vector class probabilities delta.
> +    * - __u8
> +      - ``mv.class0_bit[2]``
> +      - Motion vector class0 bit probabilities delta.
> +    * - __u8
> +      - ``mv.bits[2][10]``
> +      - Motion vector bits probabilities delta.
> +    * - __u8
> +      - ``mv.class0_fr[2][2][3]``
> +      - Motion vector class0 fractional bit probabilities delta.
> +    * - __u8
> +      - ``mv.fr[2][3]``
> +      - Motion vector fractional bit probabilities delta.
> +    * - __u8
> +      - ``mv.class0_hp[2]``
> +      - Motion vector class0 high precision fractional bit probabilities delta.
> +    * - __u8
> +      - ``mv.hp[2]``
> +      - Motion vector high precision fractional bit probabilities delta.
> +
> +``V4L2_CID_STATELESS_VP9_FRAME_DECODE_PARAMS (struct)``
> +    Specifies the frame parameters for the associated VP9 frame decode request.
> +    This includes the necessary parameters for configuring a stateless hardware
> +    decoding pipeline for VP9. The bitstream parameters are defined according
> +    to :ref:`vp9`.

Are there specific sections in the spec that define these parameters? Or is it
all over the place? If it's the latter, would it be possible to add a reference
to the respective sections in the field documentation below?

Update: I noticed a lot of references to the spec in v4l2-controls.h. If those
references would answer this question, then you can refer to that header from
here. Or just copy those section references into this documentation.

> +
> +    .. note::
> +
> +       This compound control is not yet part of the public kernel API and
> +       it is expected to change.

Since this patch series add this to uAPI right away, this note must be dropped.

> +
> +.. c:type:: v4l2_ctrl_vp9_frame_decode_params
> +
> +.. cssclass:: longtable
> +
> +.. tabularcolumns:: |p{1.5cm}|p{6.3cm}|p{9.4cm}|
> +
> +.. flat-table:: struct v4l2_ctrl_vp9_frame_decode_params
> +    :header-rows:  0
> +    :stub-columns: 0
> +    :widths:       1 1 2
> +
> +    * - __u32
> +      - ``flags``
> +      - Combination of V4L2_VP9_FRAME_FLAG_* flags. See
> +        :c:type:`v4l2_vp9_frame_flags`.
> +    * - __u16
> +      - ``compressed_header_size``
> +      - Compressed header size in bytes.
> +    * - __u16
> +      - ``uncompressed_header_size``
> +      - Uncompressed header size in bytes.
> +    * - __u8
> +      - ``profile``
> +      - VP9 profile. Can be 0, 1, 2 or 3.
> +    * - __u8
> +      - ``reset_frame_context``
> +      - Frame context that should be used/updated when decoding the frame.
> +    * - __u8
> +      - ``bit_depth``
> +      - Component depth in bits. Must be 8 for profile 0 and 1. Must 10 or 12
> +        for profile 2 and 3.
> +    * - __u8
> +      - ``interpolation_filter``
> +      - Specifies the filter selection used for performing inter prediction. See
> +        :c:type:`v4l2_vp9_interpolation_filter`.
> +    * - __u8
> +      - ``tile_cols_log2``
> +      - Specifies the base 2 logarithm of the width of each tile (where the
> +        width is measured in units of 8x8 blocks). Shall be less than or equal
> +        to 6.
> +    * - __u8
> +      - ``tile_rows_log2``
> +      - Specifies the base 2 logarithm of the height of each tile (where the
> +        height is measured in units of 8x8 blocks)

Missing period at the end of the sentence.

> +    * - __u8
> +      - ``tx_mode``
> +      - Specifies the TX mode. See :c:type:`v4l2_vp9_tx_mode`.
> +    * - __u8
> +      - ``reference_mode``
> +      - Specifies the type of inter prediction to be used. See
> +        :c:type:`v4l2_vp9_reference_mode`.
> +    * - __u8
> +      - ``padding[7]``
> +      - Needed to make this struct 64 bit aligned. Shall be filled with zeroes.
> +    * - __u16
> +      - ``frame_width_minus_1``
> +      - Add 1 to get the frame width expressed in pixels.
> +    * - __u16
> +      - ``frame_height_minus_1``
> +      - Add 1 to get the frame height expressed in pixels.

These two fields are weird. Isn't this defined by setting the output format?
And why the 'minus_1'?

> +    * - __u16
> +      - ``render_width_minus_1``
> +      - Add 1 to get the expected render width expressed in pixels. This is
> +        not used during the decoding process but might be used by HW scalers to
> +        prepare a frame that's ready for scanout.
> +    * - __u16
> +      - render_height_minus_1
> +      - Add 1 to get the expected render height expressed in pixels. This is
> +        not used during the decoding process but might be used by HW scalers to
> +        prepare a frame that's ready for scanout.

No idea what these fields are about. I suspect this can be defined by setting
the capture format, but I'm not sure.

> +    * - __u64
> +      - ``refs[3]``
> +      - Array of reference frame timestamps.
> +    * - __u8
> +      - ``ref_frame_sign_bias[4]``
> +      - Array of reference frames motion vector sign bias (prediction direction)

Missing period at the end.

> +    * - struct :c:type:`v4l2_vp9_loop_filter`
> +      - ``lf``
> +      - Loop filter parameters. See struct :c:type:`v4l2_vp9_loop_filter`.
> +    * - struct :c:type:`v4l2_vp9_quantization`
> +      - ``quant``
> +      - Quantization parameters. See :c:type:`v4l2_vp9_quantization`.
> +    * - struct :c:type:`v4l2_vp9_segmentation`
> +      - ``seg``
> +      - Segmentation parameters. See :c:type:`v4l2_vp9_segmentation`.
> +    * - struct :c:type:`v4l2_vp9_probabilities`
> +      - ``probs``
> +      - Probabilities. See :c:type:`v4l2_vp9_probabilities`.
> +
> +.. c:type:: v4l2_vp9_frame_flags
> +
> +.. cssclass:: longtable
> +
> +.. tabularcolumns:: |p{1.5cm}|p{6.3cm}|p{9.4cm}|
> +
> +.. flat-table:: enum v4l2_vp9_frame_flags
> +    :header-rows:  0
> +    :stub-columns: 0
> +    :widths:       1 2
> +
> +    * - ``V4L2_VP9_FRAME_FLAG_KEY_FRAME``
> +      - The frame is a key frame.
> +    * - ``V4L2_VP9_FRAME_FLAG_SHOW_FRAME``
> +      - The frame should be displayed.
> +    * - ``V4L2_VP9_FRAME_FLAG_ERROR_RESILIENT``
> +      - The decoding should be error resilient.
> +    * - ``V4L2_VP9_FRAME_FLAG_INTRA_ONLY``
> +      - The frame does not reference other frames.
> +    * - ``V4L2_VP9_FRAME_FLAG_ALLOW_HIGH_PREC_MV``
> +      - the frame might can high precision motion vectors.

'might can'? Should that be 'can use'?

> +    * - ``V4L2_VP9_FRAME_FLAG_REFRESH_FRAME_CTX``
> +      - Frame context should be updated after decoding.
> +    * - ``V4L2_VP9_FRAME_FLAG_PARALLEL_DEC_MODE``
> +      - Parallel decoding is used.
> +    * - ``V4L2_VP9_FRAME_FLAG_X_SUBSAMPLING``
> +      - Vertical subsampling is enabled.
> +    * - ``V4L2_VP9_FRAME_FLAG_Y_SUBSAMPLING``
> +      - Horizontal subsampling is enabled.
> +    * - ``V4L2_VP9_FRAME_FLAG_COLOR_RANGE_FULL_SWING``
> +      - The full UV range is used.
> +
> +.. c:type:: v4l2_vp9_ref_id
> +
> +.. cssclass:: longtable
> +
> +.. tabularcolumns:: |p{1.5cm}|p{6.3cm}|p{9.4cm}|
> +
> +.. flat-table:: enum v4l2_vp9_ref_id
> +    :header-rows:  0
> +    :stub-columns: 0
> +    :widths:       1 2
> +
> +    * - ``V4L2_REF_ID_LAST``
> +      - Last reference frame.
> +    * - ``V4L2_REF_ID_GOLDEN``
> +      - Golden reference frame.
> +    * - ``V4L2_REF_ID_ALTREF``
> +      - Alternative reference frame.
> +    * - ``V4L2_REF_ID_CNT``
> +      - Number of reference frames.
> +
> +.. c:type:: v4l2_vp9_tx_mode
> +
> +.. cssclass:: longtable
> +
> +.. tabularcolumns:: |p{1.5cm}|p{6.3cm}|p{9.4cm}|
> +
> +.. flat-table:: enum v4l2_vp9_tx_mode
> +    :header-rows:  0
> +    :stub-columns: 0
> +    :widths:       1 2
> +
> +    * - ``V4L2_VP9_TX_MODE_ONLY_4X4``
> +      - Transform size is 4x4.
> +    * - ``V4L2_VP9_TX_MODE_ALLOW_8X8``
> +      - Transform size can be up to 8x8.
> +    * - ``V4L2_VP9_TX_MODE_ALLOW_16X16``
> +      - Transform size can be up to 16x16.
> +    * - ``V4L2_VP9_TX_MODE_ALLOW_32X32``
> +      - transform size can be up to 32x32.
> +    * - ``V4L2_VP9_TX_MODE_SELECT``
> +      - Bitstream contains transform size for each block.

Either 'contains the transform size' or 'contains transform sizes',
whichever is appropriate.

> +
> +.. c:type:: v4l2_vp9_reference_mode
> +
> +.. cssclass:: longtable
> +
> +.. tabularcolumns:: |p{1.5cm}|p{6.3cm}|p{9.4cm}|
> +
> +.. flat-table:: enum v4l2_vp9_reference_mode
> +    :header-rows:  0
> +    :stub-columns: 0
> +    :widths:       1 2
> +
> +    * - ``V4L2_VP9_REF_MODE_SINGLE``
> +      - Indicates that all the inter blocks use only a single reference frame
> +        to generate motion compensated prediction.
> +    * - ``V4L2_VP9_REF_MODE_COMPOUND``
> +      - Requires all the inter blocks to use compound mode. Single reference
> +        frame prediction is not allowed.
> +    * - ``V4L2_VP9_REF_MODE_SELECT``
> +      - Allows each individual inter block to select between single and
> +        compound prediction modes.
> +
> +.. c:type:: v4l2_vp9_interpolation_filter
> +
> +.. cssclass:: longtable
> +
> +.. tabularcolumns:: |p{1.5cm}|p{6.3cm}|p{9.4cm}|
> +
> +.. flat-table:: enum v4l2_vp9_interpolation_filter
> +    :header-rows:  0
> +    :stub-columns: 0
> +    :widths:       1 2
> +
> +    * - ``V4L2_VP9_INTERP_FILTER_8TAP``
> +      - Height tap filter.
> +    * - ``V4L2_VP9_INTERP_FILTER_8TAP_SMOOTH``
> +      - Height tap smooth filter.
> +    * - ``V4L2_VP9_INTERP_FILTER_8TAP_SHARP``
> +      - Height tap sharp filter.
> +    * - ``V4L2_VP9_INTERP_FILTER_BILINEAR``
> +      - Bilinear filter.
> +    * - ``V4L2_VP9_INTERP_FILTER_SWITCHABLE``
> +      - Filter selection is signaled at the block level.
> +
> +.. c:type:: v4l2_vp9_reset_frame_context
> +
> +.. cssclass:: longtable
> +
> +.. tabularcolumns:: |p{1.5cm}|p{6.3cm}|p{9.4cm}|
> +
> +.. flat-table:: enum v4l2_vp9_reset_frame_context
> +    :header-rows:  0
> +    :stub-columns: 0
> +    :widths:       1 2
> +
> +    * - ``V4L2_VP9_RESET_FRAME_CTX_NONE``
> +      - Do not reset any frame context.
> +    * - ``V4L2_VP9_RESET_FRAME_CTX_SPEC``
> +      - Reset the frame context pointed by

pointed -> pointed to

> +        :c:type:`v4l2_ctrl_vp9_frame_decode_params`.frame_context_idx.
> +    * - ``V4L2_VP9_RESET_FRAME_CTX_ALL``
> +      - Reset all frame contexts.
> +
> +.. c:type:: v4l2_vp9_intra_prediction_mode
> +
> +.. cssclass:: longtable
> +
> +.. tabularcolumns:: |p{1.5cm}|p{6.3cm}|p{9.4cm}|
> +
> +.. flat-table:: enum v4l2_vp9_intra_prediction_mode
> +    :header-rows:  0
> +    :stub-columns: 0
> +    :widths:       1 2
> +
> +    * - ``V4L2_VP9_INTRA_PRED_DC``
> +      - DC intra prediction.
> +    * - ``V4L2_VP9_INTRA_PRED_MODE_V``
> +      - Vertical intra prediction.
> +    * - ``V4L2_VP9_INTRA_PRED_MODE_H``
> +      - Horizontal intra prediction.
> +    * - ``V4L2_VP9_INTRA_PRED_MODE_D45``
> +      - D45 intra prediction.
> +    * - ``V4L2_VP9_INTRA_PRED_MODE_D135``
> +      - D135 intra prediction.
> +    * - ``V4L2_VP9_INTRA_PRED_MODE_D117``
> +      - D117 intra prediction.
> +    * - ``V4L2_VP9_INTRA_PRED_MODE_D153``
> +      - D153 intra prediction.
> +    * - ``V4L2_VP9_INTRA_PRED_MODE_D207``
> +      - D207 intra prediction.
> +    * - ``V4L2_VP9_INTRA_PRED_MODE_D63``
> +      - D63 intra prediction.
> +    * - ``V4L2_VP9_INTRA_PRED_MODE_TM``
> +      - True motion intra prediction.
> +
> +.. c:type:: v4l2_vp9_segmentation
> +
> +.. cssclass:: longtable
> +
> +.. tabularcolumns:: |p{1.5cm}|p{6.3cm}|p{9.4cm}|
> +
> +.. flat-table:: struct v4l2_vp9_segmentation
> +    :header-rows:  0
> +    :stub-columns: 0
> +    :widths:       1 1 2
> +
> +    * - __u8
> +      - ``flags``
> +      - Combination of V4L2_VP9_SEGMENTATION_FLAG_* flags. See
> +        :c:type:`v4l2_vp9_segmentation_flags`.
> +    * - __u8
> +      - ``tree_probs[7]``
> +      - Specifies the probability values to be used when decoding a Segment-ID.
> +        See '5.15. Segmentation map' section of :ref:`vp9` for more details.
> +    * - __u8
> +      - ``pred_prob[3]``
> +      - Specifies the probability values to be used when decoding a
> +        Predicted-Segment-ID. See '6.4.14. Get segment id syntax'
> +        section of :ref:`vp9` for more details.
> +    * - __u8
> +      - ``padding[5]``
> +      - Used to align this struct on 64 bit. Shall be filled with zeroes.

I would prefer to have this at the end of the struct. In general I
prefer padding at the end, not in the middle of a struct, if at all
possible.

> +    * - __u8
> +      - ``feature_enabled[8]``
> +      - Bitmask defining which features are enabled in each segment.
> +    * - __u8
> +      - ``feature_data[8][4]``
> +      - Data attached to each feature. Data entry is only valid if the feature
> +        is enabled.
> +
> +.. c:type:: v4l2_vp9_segment_feature
> +
> +.. cssclass:: longtable
> +
> +.. tabularcolumns:: |p{1.5cm}|p{6.3cm}|p{9.4cm}|
> +
> +.. flat-table:: enum v4l2_vp9_segment_feature
> +    :header-rows:  0
> +    :stub-columns: 0
> +    :widths:       1 2
> +
> +    * - ``V4L2_VP9_SEGMENT_FEATURE_QP_DELTA``
> +      - QP delta segment feature.
> +    * - ``V4L2_VP9_SEGMENT_FEATURE_LF``
> +      - Loop filter segment feature.
> +    * - ``V4L2_VP9_SEGMENT_FEATURE_REF_FRAME``
> +      - Reference frame segment feature.
> +    * - ``V4L2_VP9_SEGMENT_FEATURE_SKIP``
> +      - Skip segment feature.
> +    * - ``V4L2_VP9_SEGMENT_FEATURE_CNT``
> +      - Number of segment features.
> +
> +.. c:type:: v4l2_vp9_segmentation_flags
> +
> +.. cssclass:: longtable
> +
> +.. tabularcolumns:: |p{1.5cm}|p{6.3cm}|p{9.4cm}|
> +
> +.. flat-table:: enum v4l2_vp9_segmentation_flags
> +    :header-rows:  0
> +    :stub-columns: 0
> +    :widths:       1 2
> +
> +    * - ``V4L2_VP9_SEGMENTATION_FLAG_ENABLED``
> +      - Indicates that this frame makes use of the segmentation tool.
> +    * - ``V4L2_VP9_SEGMENTATION_FLAG_UPDATE_MAP``
> +      - Indicates that the segmentation map should be updated during the
> +        decoding of this frame.
> +    * - ``V4L2_VP9_SEGMENTATION_FLAG_TEMPORAL_UPDATE``
> +      - Indicates that the updates to the segmentation map are coded
> +        relative to the existing segmentation map.
> +    * - ``V4L2_VP9_SEGMENTATION_FLAG_UPDATE_DATA``
> +      - Indicates that new parameters are about to be specified for each
> +        segment.
> +    * - ``V4L2_VP9_SEGMENTATION_FLAG_ABS_OR_DELTA_UPDATE``
> +      - Indicates that the segmentation parameters represent the actual values
> +        to be used.
> +
> +.. c:type:: v4l2_vp9_quantization
> +
> +.. cssclass:: longtable
> +
> +.. tabularcolumns:: |p{1.5cm}|p{6.3cm}|p{9.4cm}|
> +
> +.. flat-table:: struct v4l2_vp9_quantization
> +    :header-rows:  0
> +    :stub-columns: 0
> +    :widths:       1 1 2
> +
> +    * - __u8
> +      - ``base_q_idx``
> +      - Indicates the base frame qindex.
> +    * - __s8
> +      - ``delta_q_y_dc``
> +      - Indicates the Y DC quantizer relative to base_q_idx.
> +    * - __s8
> +      - ``delta_q_uv_dc``
> +      - Indicates the UV DC quantizer relative to base_q_idx.
> +    * - __s8
> +      - ``delta_q_uv_ac``
> +      - Indicates the UV AC quantizer relative to base_q_idx.
> +    * - __u8
> +      - ``padding[4]``
> +      - Padding bytes used to align this struct on 64 bit. Must be set to 0.
> +
> +.. c:type:: v4l2_vp9_loop_filter
> +
> +.. cssclass:: longtable
> +
> +.. tabularcolumns:: |p{1.5cm}|p{6.3cm}|p{9.4cm}|
> +
> +.. flat-table:: struct v4l2_vp9_loop_filter
> +    :header-rows:  0
> +    :stub-columns: 0
> +    :widths:       1 1 2
> +
> +    * - __u8
> +      - ``flags``
> +      - Combination of V4L2_VP9_LOOP_FILTER_FLAG_* flags.
> +        See :c:type:`v4l2_vp9_loop_filter_flags`.
> +    * - __u8
> +      - ``level``
> +      - Indicates the loop filter strength.
> +    * - __u8
> +      - ``sharpness``
> +      - Indicates the sharpness level.
> +    * - __s8
> +      - ``ref_deltas[4]``
> +      - Contains the adjustment needed for the filter level based on the chosen
> +        reference frame.
> +    * - __s8
> +      - ``mode_deltas[2]``
> +      - Contains the adjustment needed for the filter level based on the chosen
> +        mode
> +    * - __u8
> +      - ``level_lookup[8][4][2]``
> +      - Level lookup table.
> +
> +
> +.. c:type:: v4l2_vp9_loop_filter_flags
> +
> +.. cssclass:: longtable
> +
> +.. tabularcolumns:: |p{1.5cm}|p{6.3cm}|p{9.4cm}|
> +
> +.. flat-table:: enum v4l2_vp9_loop_filter_flags
> +    :header-rows:  0
> +    :stub-columns: 0
> +    :widths:       1 2
> +
> +    * - ``V4L2_VP9_LOOP_FILTER_FLAG_DELTA_ENABLED``
> +      - When set, the filter level depends on the mode and reference frame used
> +        to predict a block.
> +    * - ``V4L2_VP9_LOOP_FILTER_FLAG_DELTA_UPDATE``
> +      - When set, the bitstream contains additional syntax elements that
> +        specify which mode and reference frame deltas are to be updated.
> diff --git a/Documentation/userspace-api/media/v4l/pixfmt-compressed.rst b/Documentation/userspace-api/media/v4l/pixfmt-compressed.rst
> index 6dba70da822b..7e34aeb1cb92 100644
> --- a/Documentation/userspace-api/media/v4l/pixfmt-compressed.rst
> +++ b/Documentation/userspace-api/media/v4l/pixfmt-compressed.rst
> @@ -171,6 +171,21 @@ Compressed Formats
>        - VP9 compressed video frame. The encoder generates one
>  	compressed frame per buffer, and the decoder requires one
>  	compressed frame per buffer.
> +    * .. _V4L2-PIX-FMT-VP9_FRAME:
> +
> +      - ``V4L2_PIX_FMT_VP9_FRAME``
> +      - 'VP9F'
> +      - VP9 parsed frame, including the frame header, as extracted from the container.
> +	This format is adapted for stateless video decoders that implement an

an -> a

> +	VP9 pipeline with the :ref:`stateless_decoder`.
> +	Metadata associated with the frame to decode is required to be passed
> +	through the ``V4L2_CID_STATELESS_VP9_FRAME_DECODE_PARAMS`` and
> +	the ``V4L2_CID_STATELESS_VP9_COMPRESSED_HDR_PROBS`` controls.
> +	See the :ref:`associated Codec Control IDs <v4l2-codec-stateless-vp9>`.
> +	Exactly one output and one capture buffer must be provided for use with
> +	this pixel format. The output buffer must contain the appropriate number
> +	of macroblocks to decode a full corresponding frame to the matching
> +	capture buffer.
>      * .. _V4L2-PIX-FMT-HEVC:
>  
>        - ``V4L2_PIX_FMT_HEVC``
> diff --git a/Documentation/userspace-api/media/v4l/vidioc-g-ext-ctrls.rst b/Documentation/userspace-api/media/v4l/vidioc-g-ext-ctrls.rst
> index 3ba22983d21f..3ff72ca63772 100644
> --- a/Documentation/userspace-api/media/v4l/vidioc-g-ext-ctrls.rst
> +++ b/Documentation/userspace-api/media/v4l/vidioc-g-ext-ctrls.rst
> @@ -221,6 +221,14 @@ still cause this situation.
>        - ``p_vp8_frame``
>        - A pointer to a struct :c:type:`v4l2_ctrl_vp8_frame`. Valid if this control is
>          of type ``V4L2_CTRL_TYPE_VP8_FRAME``.
> +    * - struct :c:type:`v4l2_ctrl_vp9_compressed_hdr_probs` *
> +      - ``p_vp9_compressed_hdr_probs``
> +      - A pointer to a struct :c:type:`v4l2_ctrl_vp9_compressed_hdr_probs'. Valid if this contro is

contro -> control

> +        of type ``V4L2_CTRL_TYPE_VP9_COMPRESSED_HDR_PROBS``.
> +    * - struct :c:type:`v4l2_ctrl_vp9_frame_decode_params` *
> +      - ``p_vp9_frame_decode_params``
> +      - A pointer to a struct :c:type:`v4l2_ctrl_vp9_frame_decode_params'. Valid if this contro is

ditto

> +        of type ``V4L2_CTRL_TYPE_VP9_FRAME_DECODE_PARAMS``.
>      * - struct :c:type:`v4l2_ctrl_hdr10_cll_info` *
>        - ``p_hdr10_cll``
>        - A pointer to a struct :c:type:`v4l2_ctrl_hdr10_cll_info`. Valid if this control is
> diff --git a/Documentation/userspace-api/media/v4l/vidioc-queryctrl.rst b/Documentation/userspace-api/media/v4l/vidioc-queryctrl.rst
> index 8a285daedc6a..85fb8b7a9428 100644
> --- a/Documentation/userspace-api/media/v4l/vidioc-queryctrl.rst
> +++ b/Documentation/userspace-api/media/v4l/vidioc-queryctrl.rst
> @@ -495,6 +495,18 @@ See also the examples in :ref:`control`.
>        - n/a
>        - A struct :c:type:`v4l2_ctrl_vp8_frame`, containing VP8
>  	frame parameters for stateless video decoders.
> +    * - ``V4L2_CTRL_TYPE_VP9_COMPRESSED_HDR_PROBS``
> +      - n/a
> +      - n/a
> +      - n/a
> +      - A struct :c:type:`v4l2_ctrl_vp9_compressed_hdr_probs`, containing VP9
> +	probabilities updates for stateless video decoders.
> +    * - ``V4L2_CTRL_TYPE_VP9_FRAME_DECODE_PARAMS``
> +      - n/a
> +      - n/a
> +      - n/a
> +      - A struct :c:type:`v4l2_ctrl_vp9_compressed_hdr_probs`, containing VP9

v4l2_ctrl_vp9_compressed_hdr_probs -> v4l2_ctrl_vp9_frame_decode_params

> +	frame decode parameters for stateless video decoders.
>  
>  .. raw:: latex
>  
> diff --git a/Documentation/userspace-api/media/videodev2.h.rst.exceptions b/Documentation/userspace-api/media/videodev2.h.rst.exceptions
> index f59940352faa..fdc6f2b22df8 100644
> --- a/Documentation/userspace-api/media/videodev2.h.rst.exceptions
> +++ b/Documentation/userspace-api/media/videodev2.h.rst.exceptions
> @@ -148,6 +148,8 @@ replace symbol V4L2_CTRL_TYPE_HEVC_SLICE_PARAMS :c:type:`v4l2_ctrl_type`
>  replace symbol V4L2_CTRL_TYPE_AREA :c:type:`v4l2_ctrl_type`
>  replace symbol V4L2_CTRL_TYPE_FWHT_PARAMS :c:type:`v4l2_ctrl_type`
>  replace symbol V4L2_CTRL_TYPE_VP8_FRAME :c:type:`v4l2_ctrl_type`
> +replace symbol V4L2_CTRL_TYPE_VP9_COMPRESSED_HDR_PROBS :c:type:`v4l2_ctrl_type`
> +replace symbol V4L2_CTRL_TYPE_VP9_FRAME_DECODE_PARAMS :c:type:`v4l2_ctrl_type`
>  replace symbol V4L2_CTRL_TYPE_HDR10_CLL_INFO :c:type:`v4l2_ctrl_type`
>  replace symbol V4L2_CTRL_TYPE_HDR10_MASTERING_DISPLAY :c:type:`v4l2_ctrl_type`
>  
> diff --git a/drivers/media/v4l2-core/v4l2-ctrls.c b/drivers/media/v4l2-core/v4l2-ctrls.c
> index 0d7fe1bd975a..8de7238593ab 100644
> --- a/drivers/media/v4l2-core/v4l2-ctrls.c
> +++ b/drivers/media/v4l2-core/v4l2-ctrls.c
> @@ -1215,6 +1215,8 @@ const char *v4l2_ctrl_get_name(u32 id)
>  	case V4L2_CID_STATELESS_H264_DECODE_PARAMS:		return "H264 Decode Parameters";
>  	case V4L2_CID_STATELESS_FWHT_PARAMS:			return "FWHT Stateless Parameters";
>  	case V4L2_CID_STATELESS_VP8_FRAME:			return "VP8 Frame Parameters";
> +	case V4L2_CID_STATELESS_VP9_COMPRESSED_HDR_PROBS:	return "VP9 Probabilities Updates";
> +	case V4L2_CID_STATELESS_VP9_FRAME_DECODE_PARAMS:	return "VP9 Frame Decode Parameters";
>  
>  	/* Colorimetry controls */
>  	/* Keep the order of the 'case's the same as in v4l2-controls.h! */
> @@ -1517,6 +1519,12 @@ void v4l2_ctrl_fill(u32 id, const char **name, enum v4l2_ctrl_type *type,
>  	case V4L2_CID_STATELESS_VP8_FRAME:
>  		*type = V4L2_CTRL_TYPE_VP8_FRAME;
>  		break;
> +	case V4L2_CID_STATELESS_VP9_FRAME_DECODE_PARAMS:
> +		*type = V4L2_CTRL_TYPE_VP9_FRAME_DECODE_PARAMS;
> +		break;
> +	case V4L2_CID_STATELESS_VP9_COMPRESSED_HDR_PROBS:
> +		*type = V4L2_CTRL_TYPE_VP9_COMPRESSED_HDR_PROBS;
> +		break;

Let's swap the order of these two cases. Everywhere else it seems that
PROBS comes before DECODE_PARARMS, so stay consistent.

>  	case V4L2_CID_MPEG_VIDEO_HEVC_SPS:
>  		*type = V4L2_CTRL_TYPE_HEVC_SPS;
>  		break;
> @@ -1836,6 +1844,12 @@ static void std_log(const struct v4l2_ctrl *ctrl)
>  	case V4L2_CTRL_TYPE_VP8_FRAME:
>  		pr_cont("VP8_FRAME");
>  		break;
> +	case V4L2_CTRL_TYPE_VP9_COMPRESSED_HDR_PROBS:
> +		pr_cont("VP9_COMPRESSED_HDR_PROBS");
> +		break;
> +	case V4L2_CTRL_TYPE_VP9_FRAME_DECODE_PARAMS:
> +		pr_cont("VP9_FRAME_DECODE_PARAMS");
> +		break;
>  	case V4L2_CTRL_TYPE_HDR10_CLL_INFO:
>  		pr_cont("HDR10_CLL_INFO");
>  		break;
> @@ -1869,6 +1883,224 @@ static void std_log(const struct v4l2_ctrl *ctrl)
>  	0;							\
>  })
>  
> +static int
> +validate_vp9_lf_params(struct v4l2_vp9_loop_filter *lf)
> +{
> +	unsigned int i, j, k;
> +
> +	if (lf->flags &
> +	    ~(V4L2_VP9_LOOP_FILTER_FLAG_DELTA_ENABLED |
> +	      V4L2_VP9_LOOP_FILTER_FLAG_DELTA_UPDATE))

This is more readable because it is clearer that you are
checking flags against invalid bits:

	if (lf->flags & ~(V4L2_VP9_LOOP_FILTER_FLAG_DELTA_ENABLED |
			  V4L2_VP9_LOOP_FILTER_FLAG_DELTA_UPDATE))

There are similar cases like this further down, do the same there
unless you get lines that are too long.

> +		return -EINVAL;
> +
> +	/*
> +	 * V4L2_VP9_LOOP_FILTER_FLAG_DELTA_ENABLED implies
> +	 * V4L2_VP9_LOOP_FILTER_FLAG_DELTA_UPDATE.
> +	 */
> +	if (lf->flags & V4L2_VP9_LOOP_FILTER_FLAG_DELTA_UPDATE &&
> +	    !(lf->flags & V4L2_VP9_LOOP_FILTER_FLAG_DELTA_ENABLED))
> +		return -EINVAL;
> +
> +	/* That all values are in the accepted range. */
> +	if (lf->level > GENMASK(5, 0))
> +		return -EINVAL;
> +
> +	if (lf->sharpness > GENMASK(2, 0))
> +		return -EINVAL;
> +
> +	for (i = 0; i < ARRAY_SIZE(lf->ref_deltas); i++) {

You can drop { here.

> +		if (lf->ref_deltas[i] < -63 || lf->ref_deltas[i] > 63)
> +			return -EINVAL;
> +	}
> +
> +	for (i = 0; i < ARRAY_SIZE(lf->mode_deltas); i++) {

ditto

> +		if (lf->mode_deltas[i] < -63 || lf->mode_deltas[i] > 63)
> +			return -EINVAL;
> +	}
> +
> +	for (i = 0; i < ARRAY_SIZE(lf->level_lookup); i++) {

ditto

> +		for (j = 0; j < ARRAY_SIZE(lf->level_lookup[0]); j++) {

ditto

> +			for (k = 0; k < ARRAY_SIZE(lf->level_lookup[0][0]); k++) {

ditto

> +				if (lf->level_lookup[i][j][k] > 63)
> +					return -EINVAL;
> +			}
> +		}
> +	}
> +
> +	return 0;
> +}
> +
> +static int
> +validate_vp9_quant_params(struct v4l2_vp9_quantization *quant)
> +{
> +	if (quant->delta_q_y_dc < -15 || quant->delta_q_y_dc > 15 ||
> +	    quant->delta_q_uv_dc < -15 || quant->delta_q_uv_dc > 15 ||
> +	    quant->delta_q_uv_ac < -15 || quant->delta_q_uv_ac > 15)
> +		return -EINVAL;
> +
> +	memset(quant->padding, 0, sizeof(quant->padding));

Use the zero_padding macro for this. Check other occurrence of this.

> +	return 0;
> +}
> +
> +static int
> +validate_vp9_seg_params(struct v4l2_vp9_segmentation *seg)
> +{
> +	unsigned int i, j;
> +
> +	if (seg->flags &
> +	    ~(V4L2_VP9_SEGMENTATION_FLAG_ENABLED |
> +	      V4L2_VP9_SEGMENTATION_FLAG_UPDATE_MAP |
> +	      V4L2_VP9_SEGMENTATION_FLAG_TEMPORAL_UPDATE |
> +	      V4L2_VP9_SEGMENTATION_FLAG_UPDATE_DATA |
> +	      V4L2_VP9_SEGMENTATION_FLAG_ABS_OR_DELTA_UPDATE))
> +		return -EINVAL;
> +
> +	/*
> +	 * V4L2_VP9_SEGMENTATION_FLAG_UPDATE_MAP and
> +	 * V4L2_VP9_SEGMENTATION_FLAG_UPDATE_DATA imply
> +	 * V4L2_VP9_SEGMENTATION_FLAG_ENABLED.
> +	 */
> +	if ((seg->flags &
> +	     (V4L2_VP9_SEGMENTATION_FLAG_UPDATE_MAP |
> +	      V4L2_VP9_SEGMENTATION_FLAG_UPDATE_DATA)) &&
> +	    !(seg->flags & V4L2_VP9_SEGMENTATION_FLAG_ENABLED))
> +		return -EINVAL;
> +
> +	/*
> +	 * V4L2_VP9_SEGMENTATION_FLAG_TEMPORAL_UPDATE implies
> +	 * V4L2_VP9_SEGMENTATION_FLAG_UPDATE_MAP.
> +	 */
> +	if (seg->flags & V4L2_VP9_SEGMENTATION_FLAG_TEMPORAL_UPDATE &&
> +	    !(seg->flags & V4L2_VP9_SEGMENTATION_FLAG_UPDATE_MAP))
> +		return -EINVAL;
> +
> +	/*
> +	 * V4L2_VP9_SEGMENTATION_FLAG_ABS_OR_DELTA_UPDATE implies
> +	 * V4L2_VP9_SEGMENTATION_FLAG_UPDATE_DATA.
> +	 */
> +	if (seg->flags & V4L2_VP9_SEGMENTATION_FLAG_ABS_OR_DELTA_UPDATE &&
> +	    !(seg->flags & V4L2_VP9_SEGMENTATION_FLAG_UPDATE_DATA))
> +		return -EINVAL;
> +
> +	for (i = 0; i < ARRAY_SIZE(seg->feature_enabled); i++) {
> +		if (seg->feature_enabled[i] &
> +		    ~(V4L2_VP9_SEGMENT_FEATURE_QP_DELTA |
> +		      V4L2_VP9_SEGMENT_FEATURE_LF |
> +		      V4L2_VP9_SEGMENT_FEATURE_REF_FRAME |
> +		      V4L2_VP9_SEGMENT_FEATURE_SKIP))
> +			return -EINVAL;
> +	}
> +
> +	for (i = 0; i < ARRAY_SIZE(seg->feature_data); i++) {
> +		const int range[] = {255, 63, 3, 0};

Space after/before { and }.

> +
> +		for (j = 0; j < ARRAY_SIZE(seg->feature_data[j]); j++) {
> +			if (seg->feature_data[i][j] < -range[j] ||
> +			    seg->feature_data[i][j] > range[j])
> +				return -EINVAL;
> +		}
> +	}
> +
> +	memset(seg->padding, 0, sizeof(seg->padding));
> +	return 0;
> +}
> +
> +static int
> +validate_vp9_frame_decode_params(struct v4l2_ctrl_vp9_frame_decode_params *dec_params)
> +{
> +	int ret, i;
> +
> +	/* Make sure we're not passed invalid flags. */
> +	if (dec_params->flags &
> +	    ~(V4L2_VP9_FRAME_FLAG_KEY_FRAME |
> +	      V4L2_VP9_FRAME_FLAG_SHOW_FRAME |
> +	      V4L2_VP9_FRAME_FLAG_ERROR_RESILIENT |
> +	      V4L2_VP9_FRAME_FLAG_INTRA_ONLY |
> +	      V4L2_VP9_FRAME_FLAG_ALLOW_HIGH_PREC_MV |
> +	      V4L2_VP9_FRAME_FLAG_REFRESH_FRAME_CTX |
> +	      V4L2_VP9_FRAME_FLAG_PARALLEL_DEC_MODE |
> +	      V4L2_VP9_FRAME_FLAG_X_SUBSAMPLING |
> +	      V4L2_VP9_FRAME_FLAG_Y_SUBSAMPLING |
> +	      V4L2_VP9_FRAME_FLAG_COLOR_RANGE_FULL_SWING))
> +		return -EINVAL;
> +
> +	/*
> +	 * The refresh context and error resilient flags are mutually exclusive.
> +	 * Same goes for parallel decoding and error resilient modes.
> +	 */
> +	if (dec_params->flags & V4L2_VP9_FRAME_FLAG_ERROR_RESILIENT &&
> +	    dec_params->flags &
> +	    (V4L2_VP9_FRAME_FLAG_REFRESH_FRAME_CTX |
> +	     V4L2_VP9_FRAME_FLAG_PARALLEL_DEC_MODE))
> +		return -EINVAL;
> +
> +	if (dec_params->profile > V4L2_VP9_PROFILE_MAX)
> +		return -EINVAL;
> +
> +	if (dec_params->reset_frame_context > V4L2_VP9_RESET_FRAME_CTX_ALL)
> +		return -EINVAL;
> +
> +	if (dec_params->frame_context_idx >= V4L2_VP9_NUM_FRAME_CTX)
> +		return -EINVAL;
> +
> +	/*
> +	 * Profiles 0 and 1 only support 8-bit depth, profiles 2 and 3 only 10
> +	 * and 12 bit depths.
> +	 */
> +	if ((dec_params->profile < 2 && dec_params->bit_depth != 8) ||
> +	    (dec_params->profile >= 2 &&
> +	     (dec_params->bit_depth != 10 && dec_params->bit_depth != 12)))
> +		return -EINVAL;
> +
> +	/* Profile 0 and 2 only accept YUV 4:2:0. */
> +	if ((dec_params->profile == 0 || dec_params->profile == 2) &&
> +	    (!(dec_params->flags & V4L2_VP9_FRAME_FLAG_X_SUBSAMPLING) ||
> +	     !(dec_params->flags & V4L2_VP9_FRAME_FLAG_Y_SUBSAMPLING)))
> +		return -EINVAL;
> +
> +	/* Profile 1 and 3 only accept YUV 4:2:2, 4:4:0 and 4:4:4. */
> +	if ((dec_params->profile == 1 || dec_params->profile == 3) &&
> +	    ((dec_params->flags & V4L2_VP9_FRAME_FLAG_X_SUBSAMPLING) &&
> +	     (dec_params->flags & V4L2_VP9_FRAME_FLAG_Y_SUBSAMPLING)))
> +		return -EINVAL;
> +
> +	if (dec_params->interpolation_filter > V4L2_VP9_INTERP_FILTER_SWITCHABLE)
> +		return -EINVAL;
> +
> +	/*
> +	 * According to the spec, tile_cols_log2 shall be less than or equal
> +	 * to 6.
> +	 */
> +	if (dec_params->tile_cols_log2 > 6)
> +		return -EINVAL;
> +
> +	if (dec_params->tx_mode > V4L2_VP9_TX_MODE_SELECT)
> +		return -EINVAL;
> +
> +	if (dec_params->reference_mode > V4L2_VP9_REF_MODE_SELECT)
> +		return -EINVAL;
> +
> +	for (i = 0; i < V4L2_REF_ID_CNT + 1; ++i)
> +		if (dec_params->ref_frame_sign_bias[i] != 0 &&
> +		    dec_params->ref_frame_sign_bias[i] != 1)
> +			return -EINVAL;
> +
> +	ret = validate_vp9_lf_params(&dec_params->lf);
> +	if (ret)
> +		return ret;
> +
> +	ret = validate_vp9_quant_params(&dec_params->quant);
> +	if (ret)
> +		return ret;
> +
> +	ret = validate_vp9_seg_params(&dec_params->seg);
> +	if (ret)
> +		return ret;
> +
> +	memset(dec_params->padding, 0, sizeof(dec_params->padding));
> +	return 0;
> +}
> +
>  /* Validate a new control */
>  
>  #define zero_padding(s) \
> @@ -2127,6 +2359,12 @@ static int std_validate_compound(const struct v4l2_ctrl *ctrl, u32 idx,
>  		zero_padding(p_vp8_frame->coder_state);
>  		break;
>  
> +	case V4L2_CTRL_TYPE_VP9_FRAME_DECODE_PARAMS:
> +		return validate_vp9_frame_decode_params(p);
> +
> +	case V4L2_CTRL_TYPE_VP9_COMPRESSED_HDR_PROBS:
> +		break;
> +
>  	case V4L2_CTRL_TYPE_HEVC_SPS:
>  		p_hevc_sps = p;
>  
> @@ -2938,6 +3176,12 @@ static struct v4l2_ctrl *v4l2_ctrl_new(struct v4l2_ctrl_handler *hdl,
>  	case V4L2_CTRL_TYPE_VP8_FRAME:
>  		elem_size = sizeof(struct v4l2_ctrl_vp8_frame);
>  		break;
> +	case V4L2_CTRL_TYPE_VP9_COMPRESSED_HDR_PROBS:
> +		elem_size = sizeof(struct v4l2_ctrl_vp9_compressed_hdr_probs);
> +		break;
> +	case V4L2_CTRL_TYPE_VP9_FRAME_DECODE_PARAMS:
> +		elem_size = sizeof(struct v4l2_ctrl_vp9_frame_decode_params);
> +		break;
>  	case V4L2_CTRL_TYPE_HEVC_SPS:
>  		elem_size = sizeof(struct v4l2_ctrl_hevc_sps);
>  		break;
> diff --git a/drivers/media/v4l2-core/v4l2-ioctl.c b/drivers/media/v4l2-core/v4l2-ioctl.c
> index 6a5d1c6d11d6..dbdafa5ea127 100644
> --- a/drivers/media/v4l2-core/v4l2-ioctl.c
> +++ b/drivers/media/v4l2-core/v4l2-ioctl.c
> @@ -1431,6 +1431,7 @@ static void v4l_fill_fmtdesc(struct v4l2_fmtdesc *fmt)
>  		case V4L2_PIX_FMT_VP8:		descr = "VP8"; break;
>  		case V4L2_PIX_FMT_VP8_FRAME:    descr = "VP8 Frame"; break;
>  		case V4L2_PIX_FMT_VP9:		descr = "VP9"; break;
> +		case V4L2_PIX_FMT_VP9_FRAME:    descr = "VP9 Frame"; break;
>  		case V4L2_PIX_FMT_HEVC:		descr = "HEVC"; break; /* aka H.265 */
>  		case V4L2_PIX_FMT_HEVC_SLICE:	descr = "HEVC Parsed Slice Data"; break;
>  		case V4L2_PIX_FMT_FWHT:		descr = "FWHT"; break; /* used in vicodec */
> diff --git a/include/media/v4l2-ctrls.h b/include/media/v4l2-ctrls.h
> index a5953b812878..8c5fb22ff545 100644
> --- a/include/media/v4l2-ctrls.h
> +++ b/include/media/v4l2-ctrls.h
> @@ -50,6 +50,8 @@ struct video_device;
>   * @p_h264_decode_params:	Pointer to a struct v4l2_ctrl_h264_decode_params.
>   * @p_h264_pred_weights:	Pointer to a struct v4l2_ctrl_h264_pred_weights.
>   * @p_vp8_frame:		Pointer to a VP8 frame params structure.
> + * @p_vp9_compressed_hdr_probs:	Pointer to a VP9 frame compressed header probs structure.
> + * @p_vp9_frame_decode_params:	Pointer to a VP9 frame params structure.

Why is this called p_vp9_frame_decode_params while for VP8 it is called
p_vp8_frame? The mismatch is odd. This comment is of course about the general
naming of this control, not just this field.

>   * @p_hevc_sps:			Pointer to an HEVC sequence parameter set structure.
>   * @p_hevc_pps:			Pointer to an HEVC picture parameter set structure.
>   * @p_hevc_slice_params:	Pointer to an HEVC slice parameters structure.
> @@ -79,6 +81,8 @@ union v4l2_ctrl_ptr {
>  	struct v4l2_ctrl_hevc_sps *p_hevc_sps;
>  	struct v4l2_ctrl_hevc_pps *p_hevc_pps;
>  	struct v4l2_ctrl_hevc_slice_params *p_hevc_slice_params;
> +	struct v4l2_ctrl_vp9_compressed_hdr_probs *p_vp9_compressed_hdr_probs;
> +	struct v4l2_ctrl_vp9_frame_decode_params *p_vp9_frame_decode_params;
>  	struct v4l2_ctrl_hdr10_cll_info *p_hdr10_cll;
>  	struct v4l2_ctrl_hdr10_mastering_display *p_hdr10_mastering;
>  	struct v4l2_area *p_area;
> diff --git a/include/uapi/linux/v4l2-controls.h b/include/uapi/linux/v4l2-controls.h
> index d43bec5f1afd..ff5c574f2755 100644
> --- a/include/uapi/linux/v4l2-controls.h
> +++ b/include/uapi/linux/v4l2-controls.h
> @@ -1896,6 +1896,461 @@ struct v4l2_ctrl_hdr10_mastering_display {
>  	__u32 min_display_mastering_luminance;
>  };
>  
> +/* Stateless VP9 control */

control -> controls

> +
> +/**
> + * enum v4l2_vp9_loop_filter_flags - VP9 loop filter flags
> + *
> + * @V4L2_VP9_LOOP_FILTER_FLAG_DELTA_ENABLED: the filter level depends on
> + *					     the mode and reference frame used
> + *					     to predict a block
> + * @V4L2_VP9_LOOP_FILTER_FLAG_DELTA_UPDATE: the bitstream contains additional
> + *					    syntax elements that specify which
> + *					    mode and reference frame deltas
> + *					    are to be updated
> + *
> + * Those are the flags you should pass to &v4l2_vp9_loop_filter.flags. See
> + * section '7.2.8 Loop filter semantics' of the VP9 specification for more
> + * details.
> + */
> +enum v4l2_vp9_loop_filter_flags {
> +	V4L2_VP9_LOOP_FILTER_FLAG_DELTA_ENABLED = 1 << 0,
> +	V4L2_VP9_LOOP_FILTER_FLAG_DELTA_UPDATE = 1 << 1,
> +};
> +
> +/**
> + * struct v4l2_vp9_loop_filter - VP9 loop filter parameters
> + *
> + * @flags: combination of V4L2_VP9_LOOP_FILTER_FLAG_* flags
> + * @level: indicates the loop filter strength
> + * @sharpness: indicates the sharpness level
> + * @ref_deltas: contains the adjustment needed for the filter level based on
> + *		the chosen reference frame
> + * @mode_deltas: contains the adjustment needed for the filter level based on
> + *		 the chosen mode
> + * @level_lookup: level lookup table
> + *
> + * This structure contains all loop filter related parameters. See sections
> + * '7.2.8 Loop filter semantics' and '8.8.1 Loop filter frame init process'
> + * of the VP9 specification for more details.
> + */
> +struct v4l2_vp9_loop_filter {
> +	__u8 flags;
> +	__u8 level;
> +	__u8 sharpness;
> +	__s8 ref_deltas[4];
> +	__s8 mode_deltas[2];
> +	__u8 level_lookup[8][4][2];
> +	__u8 padding;
> +};
> +
> +/**
> + * struct v4l2_vp9_quantization - VP9 quantization parameters
> + *
> + * @base_q_idx: indicates the base frame qindex
> + * @delta_q_y_dc: indicates the Y DC quantizer relative to base_q_idx
> + * @delta_q_uv_dc: indicates the UV DC quantizer relative to base_q_idx
> + * @delta_q_uv_ac indicates the UV AC quantizer relative to base_q_idx
> + * @padding: padding bytes to align things on 64 bits. Must be set to 0
> + *
> + * Encodes the quantization parameters. See section '7.2.9 Quantization params
> + * syntax' of the VP9 specification for more details.
> + */
> +struct v4l2_vp9_quantization {
> +	__u8 base_q_idx;
> +	__s8 delta_q_y_dc;
> +	__s8 delta_q_uv_dc;
> +	__s8 delta_q_uv_ac;
> +	__u8 padding[4];
> +};
> +
> +/**
> + * enum v4l2_vp9_segmentation_flags - VP9 segmentation flags
> + *
> + * @V4L2_VP9_SEGMENTATION_FLAG_ENABLED: indicates that this frame makes use of
> + *					the segmentation tool

Don't indent so far to the right. In case like this you just add a single TAB
after the *. Same elsewhere.

> + * @V4L2_VP9_SEGMENTATION_FLAG_UPDATE_MAP: indicates that the segmentation map
> + *					   should be updated during the
> + *					   decoding of this frame
> + * @V4L2_VP9_SEGMENTATION_FLAG_TEMPORAL_UPDATE: indicates that the updates to
> + *						the segmentation map are coded
> + *						relative to the existing
> + *						segmentation map
> + * @V4L2_VP9_SEGMENTATION_FLAG_UPDATE_DATA: indicates that new parameters are
> + *					    about to be specified for each
> + *					    segment
> + * @V4L2_VP9_SEGMENTATION_FLAG_ABS_OR_DELTA_UPDATE: indicates that the
> + *						    segmentation parameters
> + *						    represent the actual values
> + *						    to be used
> + *
> + * Those are the flags you should pass to &v4l2_vp9_segmentation.flags. See
> + * section '7.2.10 Segmentation params syntax' of the VP9 specification for
> + * more details.
> + */
> +enum v4l2_vp9_segmentation_flags {
> +	V4L2_VP9_SEGMENTATION_FLAG_ENABLED = 1 << 0,
> +	V4L2_VP9_SEGMENTATION_FLAG_UPDATE_MAP = 1 << 1,
> +	V4L2_VP9_SEGMENTATION_FLAG_TEMPORAL_UPDATE = 1 << 2,
> +	V4L2_VP9_SEGMENTATION_FLAG_UPDATE_DATA = 1 << 3,
> +	V4L2_VP9_SEGMENTATION_FLAG_ABS_OR_DELTA_UPDATE = 1 << 4,
> +};
> +
> +#define V4L2_VP9_SEGMENT_FEATURE_ENABLED(id)	(1 << (id))
> +#define V4L2_VP9_SEGMENT_FEATURE_ENABLED_MASK	0xf
> +
> +/**
> + * enum v4l2_vp9_segment_feature - VP9 segment feature IDs
> + *
> + * @V4L2_VP9_SEGMENT_FEATURE_QP_DELTA: QP delta segment feature
> + * @V4L2_VP9_SEGMENT_FEATURE_LF: loop filter segment feature
> + * @V4L2_VP9_SEGMENT_FEATURE_REF_FRAME: reference frame segment feature
> + * @V4L2_VP9_SEGMENT_FEATURE_SKIP: skip segment feature
> + * @V4L2_VP9_SEGMENT_FEATURE_CNT: number of segment features
> + *
> + * Segment feature IDs. See section '7.2.10 Segmentation params syntax' of the
> + * VP9 specification for more details.
> + */
> +enum v4l2_vp9_segment_feature {
> +	V4L2_VP9_SEGMENT_FEATURE_QP_DELTA,
> +	V4L2_VP9_SEGMENT_FEATURE_LF,
> +	V4L2_VP9_SEGMENT_FEATURE_REF_FRAME,
> +	V4L2_VP9_SEGMENT_FEATURE_SKIP,
> +	V4L2_VP9_SEGMENT_FEATURE_CNT,
> +};
> +
> +/**
> + * struct v4l2_vp9_segmentation - VP9 segmentation parameters
> + *
> + * @flags: combination of V4L2_VP9_SEGMENTATION_FLAG_* flags
> + * @tree_probs: specifies the probability values to be used when
> + *              decoding a Segment-ID. See '5.15. Segmentation map'
> + *              section of the VP9 specification for more details.
> + * @pred_prob: specifies the probability values to be used when decoding a
> + *	       Predicted-Segment-ID. See '6.4.14. Get segment id syntax'
> + *	       section of :ref:`vp9` for more details..
> + * @padding: padding used to make things aligned on 64 bits. Shall be zero
> + *	     filled
> + * @feature_enabled: bitmask defining which features are enabled in each
> + *		     segment
> + * @feature_data: data attached to each feature. Data entry is only valid if
> + *		  the feature is enabled
> + *
> + * Encodes the quantization parameters. See section '7.2.10 Segmentation
> + * params syntax' of the VP9 specification for more details.
> + */
> +struct v4l2_vp9_segmentation {
> +	__u8 flags;
> +	__u8 tree_probs[7];
> +	__u8 pred_probs[3];
> +	__u8 padding[5];
> +	__u8 feature_enabled[8];
> +	__s16 feature_data[8][4];
> +};
> +
> +/**
> + * enum v4l2_vp9_intra_prediction_mode - VP9 Intra prediction modes
> + *
> + * @V4L2_VP9_INTRA_PRED_DC: DC intra prediction
> + * @V4L2_VP9_INTRA_PRED_MODE_V: vertical intra prediction
> + * @V4L2_VP9_INTRA_PRED_MODE_H: horizontal intra prediction
> + * @V4L2_VP9_INTRA_PRED_MODE_D45: D45 intra prediction
> + * @V4L2_VP9_INTRA_PRED_MODE_D135: D135 intra prediction
> + * @V4L2_VP9_INTRA_PRED_MODE_D117: D117 intra prediction
> + * @V4L2_VP9_INTRA_PRED_MODE_D153: D153 intra prediction
> + * @V4L2_VP9_INTRA_PRED_MODE_D207: D207 intra prediction
> + * @V4L2_VP9_INTRA_PRED_MODE_D63: D63 intra prediction
> + * @V4L2_VP9_INTRA_PRED_MODE_TM: True Motion intra prediction
> + *
> + * See section '7.4.5 Intra frame mode info semantics' for more details.
> + */
> +enum v4l2_vp9_intra_prediction_mode {
> +	V4L2_VP9_INTRA_PRED_MODE_DC,
> +	V4L2_VP9_INTRA_PRED_MODE_V,
> +	V4L2_VP9_INTRA_PRED_MODE_H,
> +	V4L2_VP9_INTRA_PRED_MODE_D45,
> +	V4L2_VP9_INTRA_PRED_MODE_D135,
> +	V4L2_VP9_INTRA_PRED_MODE_D117,
> +	V4L2_VP9_INTRA_PRED_MODE_D153,
> +	V4L2_VP9_INTRA_PRED_MODE_D207,
> +	V4L2_VP9_INTRA_PRED_MODE_D63,
> +	V4L2_VP9_INTRA_PRED_MODE_TM,
> +};
> +
> +/**
> + * enum v4l2_vp9_reset_frame_context - Valid values for
> + *			&v4l2_ctrl_vp9_frame_decode_params->reset_frame_context
> + *
> + * @V4L2_VP9_RESET_FRAME_CTX_NONE: don't reset any frame context
> + * @V4L2_VP9_RESET_FRAME_CTX_SPEC: reset the frame context pointed by
> + *			&v4l2_ctrl_vp9_frame_decode_params.frame_context_idx
> + * @V4L2_VP9_RESET_FRAME_CTX_ALL: reset all frame contexts
> + *
> + * See section '7.2 Uncompressed header semantics' of the VP9 specification
> + * for more details.
> + */
> +enum v4l2_vp9_reset_frame_context {
> +	V4L2_VP9_RESET_FRAME_CTX_NONE,
> +	V4L2_VP9_RESET_FRAME_CTX_SPEC,
> +	V4L2_VP9_RESET_FRAME_CTX_ALL,
> +};
> +
> +/**
> + * enum v4l2_vp9_interpolation_filter - VP9 interpolation filter types
> + *
> + * @V4L2_VP9_INTERP_FILTER_8TAP: height tap filter
> + * @V4L2_VP9_INTERP_FILTER_8TAP_SMOOTH: height tap smooth filter
> + * @V4L2_VP9_INTERP_FILTER_8TAP_SHARP: height tap sharp filter
> + * @V4L2_VP9_INTERP_FILTER_BILINEAR: bilinear filter
> + * @V4L2_VP9_INTERP_FILTER_SWITCHABLE: filter selection is signaled at the
> + *				       block level
> + *
> + * See section '7.2.7 Interpolation filter semantics' of the VP9 specification
> + * for more details.
> + */
> +enum v4l2_vp9_interpolation_filter {
> +	V4L2_VP9_INTERP_FILTER_8TAP,
> +	V4L2_VP9_INTERP_FILTER_8TAP_SMOOTH,
> +	V4L2_VP9_INTERP_FILTER_8TAP_SHARP,
> +	V4L2_VP9_INTERP_FILTER_BILINEAR,
> +	V4L2_VP9_INTERP_FILTER_SWITCHABLE,
> +};
> +
> +/**
> + * enum v4l2_vp9_reference_mode - VP9 reference modes
> + *
> + * @V4L2_VP9_REF_MODE_SINGLE: indicates that all the inter blocks use only a
> + *			      single reference frame to generate motion
> + *			      compensated prediction
> + * @V4L2_VP9_REF_MODE_COMPOUND: requires all the inter blocks to use compound
> + *				mode. Single reference frame prediction is not
> + *				allowed
> + * @V4L2_VP9_REF_MODE_SELECT: allows each individual inter block to select
> + *			      between single and compound prediction modes
> + *
> + * See section '7.3.6 Frame reference mode semantics' of the VP9 specification
> + * for more details.
> + */
> +enum v4l2_vp9_reference_mode {
> +	V4L2_VP9_REF_MODE_SINGLE,
> +	V4L2_VP9_REF_MODE_COMPOUND,
> +	V4L2_VP9_REF_MODE_SELECT,
> +};
> +
> +/**
> + * enum v4l2_vp9_tx_mode - VP9 TX modes
> + *
> + * @V4L2_VP9_TX_MODE_ONLY_4X4: transform size is 4x4
> + * @V4L2_VP9_TX_MODE_ALLOW_8X8: transform size can be up to 8x8
> + * @V4L2_VP9_TX_MODE_ALLOW_16X16: transform size can be up to 16x16
> + * @V4L2_VP9_TX_MODE_ALLOW_32X32: transform size can be up to 32x32
> + * @V4L2_VP9_TX_MODE_SELECT: bitstream contains transform size for each block
> + *
> + * See section '7.3.1 Tx mode semantics' of the VP9 specification for more
> + * details.
> + */
> +enum v4l2_vp9_tx_mode {
> +	V4L2_VP9_TX_MODE_ONLY_4X4,
> +	V4L2_VP9_TX_MODE_ALLOW_8X8,
> +	V4L2_VP9_TX_MODE_ALLOW_16X16,
> +	V4L2_VP9_TX_MODE_ALLOW_32X32,
> +	V4L2_VP9_TX_MODE_SELECT,
> +};
> +
> +/**
> + * enum v4l2_vp9_ref_id - VP9 Reference frame IDs
> + *
> + * @V4L2_REF_ID_LAST: last reference frame
> + * @V4L2_REF_ID_GOLDEN: golden reference frame
> + * @V4L2_REF_ID_ALTREF: alternative reference frame
> + * @V4L2_REF_ID_CNT: number of reference frames
> + *
> + * See section '7.4.12 Ref frames semantics' of the VP9 specification for more
> + * details.
> + */
> +enum v4l2_vp9_ref_id {
> +	V4L2_REF_ID_LAST,
> +	V4L2_REF_ID_GOLDEN,
> +	V4L2_REF_ID_ALTREF,
> +	V4L2_REF_ID_CNT,
> +};
> +
> +/**
> + * enum v4l2_vp9_frame_flags - VP9 frame flags
> + * @V4L2_VP9_FRAME_FLAG_KEY_FRAME: the frame is a key frame
> + * @V4L2_VP9_FRAME_FLAG_SHOW_FRAME: the frame should be displayed
> + * @V4L2_VP9_FRAME_FLAG_ERROR_RESILIENT: the decoding should be error resilient
> + * @V4L2_VP9_FRAME_FLAG_INTRA_ONLY: the frame does not reference other frames
> + * @V4L2_VP9_FRAME_FLAG_ALLOW_HIGH_PREC_MV: the frame might can high precision
> + *					    motion vectors
> + * @V4L2_VP9_FRAME_FLAG_REFRESH_FRAME_CTX: frame context should be updated
> + *					   after decoding
> + * @V4L2_VP9_FRAME_FLAG_PARALLEL_DEC_MODE: parallel decoding is used
> + * @V4L2_VP9_FRAME_FLAG_X_SUBSAMPLING: vertical subsampling is enabled
> + * @V4L2_VP9_FRAME_FLAG_Y_SUBSAMPLING: horizontal subsampling is enabled
> + * @V4L2_VP9_FRAME_FLAG_COLOR_RANGE_FULL_SWING: full UV range is used
> + *
> + * Check the VP9 specification for more details.
> + */
> +enum v4l2_vp9_frame_flags {
> +	V4L2_VP9_FRAME_FLAG_KEY_FRAME = 1 << 0,
> +	V4L2_VP9_FRAME_FLAG_SHOW_FRAME = 1 << 1,
> +	V4L2_VP9_FRAME_FLAG_ERROR_RESILIENT = 1 << 2,
> +	V4L2_VP9_FRAME_FLAG_INTRA_ONLY = 1 << 3,
> +	V4L2_VP9_FRAME_FLAG_ALLOW_HIGH_PREC_MV = 1 << 4,
> +	V4L2_VP9_FRAME_FLAG_REFRESH_FRAME_CTX = 1 << 5,
> +	V4L2_VP9_FRAME_FLAG_PARALLEL_DEC_MODE = 1 << 6,
> +	V4L2_VP9_FRAME_FLAG_X_SUBSAMPLING = 1 << 7,
> +	V4L2_VP9_FRAME_FLAG_Y_SUBSAMPLING = 1 << 8,
> +	V4L2_VP9_FRAME_FLAG_COLOR_RANGE_FULL_SWING = 1 << 9,
> +};
> +
> +#define V4L2_VP9_PROFILE_MAX		3
> +
> +#define V4L2_CID_STATELESS_VP9_FRAME_DECODE_PARAMS	(V4L2_CID_CODEC_STATELESS_BASE + 300)
> +/**
> + * struct v4l2_ctrl_vp9_frame_decode_params - VP9 frame decoding control
> + *
> + * @flags: combination of V4L2_VP9_FRAME_FLAG_* flags
> + * @compressed_header_size: compressed header size in bytes
> + * @uncompressed_header_size: uncompressed header size in bytes
> + * @profile: VP9 profile. Can be 0, 1, 2 or 3
> + * @reset_frame_context: specifies whether the frame context should be reset
> + *			 to default values. See &v4l2_vp9_reset_frame_context
> + *			 for more details
> + * @frame_context_idx: frame context that should be used/updated
> + * @bit_depth: bits per components. Can be 8, 10 or 12. Note that not all
> + *	       profiles support 10 and/or 12 bits depths
> + * @interpolation_filter: specifies the filter selection used for performing
> + *			  inter prediction. See &v4l2_vp9_interpolation_filter
> + *			  for more details
> + * @tile_cols_log2: specifies the base 2 logarithm of the width of each tile
> + *		    (where the width is measured in units of 8x8 blocks).
> + *		    Shall be less than or equal to 6
> + * @tile_rows_log2: specifies the base 2 logarithm of the height of each tile
> + *		    (where the height is measured in units of 8x8 blocks)
> + * @tx_mode: specifies the TX mode. See &v4l2_vp9_tx_mode for more details
> + * @reference_mode: specifies the type of inter prediction to be used. See
> + *		    &v4l2_vp9_reference_mode for more details
> + * @padding: needed to make this struct 64 bit aligned. Shall be filled with
> + *	     zeros
> + * @frame_width_minus_1: add 1 to it and you'll get the frame width expressed
> + *			 in pixels
> + * @frame_height_minus_1: add 1 to it and you'll get the frame height expressed
> + *			  in pixels
> + * @render_width_minus_1: add 1 to it and you'll get the expected render width
> + *			 expressed in pixels. This is not used during the
> + *			 decoding process but might be used by HW scalers to
> + *			 prepare a frame that's ready for scanout
> + * @render_height_minus_1: add 1 to it and you'll get the expected render height
> + *			 expressed in pixels. This is not used during the
> + *			 decoding process but might be used by HW scalers to
> + *			 prepare a frame that's ready for scanout
> + * @refs: array of ref frames timestamps. See &v4l2_vp9_ref_id for more details
> + * @ref_frame_sign_bias: array of reference frames motion vector sign bias
> + *			(prediction direction)
> + * @lf: loop filter parameters. See &v4l2_vp9_loop_filter for more details
> + * @quant: quantization parameters. See &v4l2_vp9_quantization for more details
> + * @seg: segmentation parameters. See &v4l2_vp9_segmentation for more details
> + */
> +struct v4l2_ctrl_vp9_frame_decode_params {
> +	__u32 flags;
> +	__u16 compressed_header_size;
> +	__u16 uncompressed_header_size;
> +	__u8 profile;
> +	__u8 reset_frame_context;
> +	__u8 frame_context_idx;
> +	__u8 bit_depth;
> +	__u8 interpolation_filter;
> +	__u8 tile_cols_log2;
> +	__u8 tile_rows_log2;
> +	__u8 tx_mode;
> +	__u8 reference_mode;
> +	__u8 padding[7];
> +	__u16 frame_width_minus_1;
> +	__u16 frame_height_minus_1;
> +	__u16 render_width_minus_1;
> +	__u16 render_height_minus_1;
> +	__u64 refs[V4L2_REF_ID_CNT];
> +	__u8 ref_frame_sign_bias[V4L2_REF_ID_CNT + 1];
> +	struct v4l2_vp9_loop_filter lf;
> +	struct v4l2_vp9_quantization quant;
> +	struct v4l2_vp9_segmentation seg;
> +};
> +
> +#define V4L2_VP9_NUM_FRAME_CTX	4
> +
> +/**
> + * struct v4l2_vp9_mv_compressed_hdr_probs - VP9 Motion vector probability updates
> + * @joint: motion vector joint probability updates
> + * @sign: motion vector sign probability updates
> + * @class: motion vector class probability updates
> + * @class0_bit: motion vector class0 bit probability updates
> + * @bits: motion vector bits probability updates
> + * @class0_fr: motion vector class0 fractional bit probability updates
> + * @fr: motion vector fractional bit probability updates
> + * @class0_hp: motion vector class0 high precision fractional bit probability updates
> + * @hp: motion vector high precision fractional bit probability updates
> + *
> + * This structure contains new values of motion vector probabilities.
> + * A value of zero means there is no update.

'A value of zero': do you mean that the whole struct is zeroed, or just specific
arrays or single bytes? It's not clear to me at what level this is done.

> + * See `struct v4l2_vp9_prob_updates` for details.
> + */
> +struct v4l2_vp9_mv_compressed_hdr_probs {
> +	__u8 joint[3];
> +	__u8 sign[2];
> +	__u8 class[2][10];
> +	__u8 class0_bit[2];
> +	__u8 bits[2][10];
> +	__u8 class0_fr[2][2][3];
> +	__u8 fr[2][3];
> +	__u8 class0_hp[2];
> +	__u8 hp[2];
> +};
> +
> +#define V4L2_CID_STATELESS_VP9_COMPRESSED_HDR_PROBS	(V4L2_CID_CODEC_STATELESS_BASE + 301)
> +/**
> + * struct v4l2_ctrl_vp9_compressed_hdr_probs - VP9 probability updates control
> + * @tx8: TX 8x8 probability updates
> + * @tx16: TX 16x16 probability updates
> + * @tx32: TX 32x32 probability updates
> + * @coef: coefficient probability updates
> + * @skip: skip probability updates
> + * @inter_mode: inter mode probability updates
> + * @interp_filter: interpolation filter probability updates
> + * @is_inter: is inter-block probability updates
> + * @comp_mode: compound prediction mode probability updates
> + * @single_ref: single ref probability updates
> + * @comp_ref: compound ref probability updates
> + * @y_mode: Y prediction mode probability updates
> + * @uv_mode: UV prediction mode probability updates
> + * @partition: partition probability updates
> + * @mv: motion vector probability updates
> + *
> + * This structure holds the probabilities update as parsed in the compressed
> + * header (Spec 6.3). These values represent the value of probability update after
> + * being translated with inv_map_table[] (see 6.3.5). A value of zero means that
> + * there is no update.

Same question.

> + */
> +struct v4l2_ctrl_vp9_compressed_hdr_probs {
> +	__u8 tx8[2][1];
> +	__u8 tx16[2][2];
> +	__u8 tx32[2][3];
> +	__u8 coef[4][2][2][6][6][3];
> +	__u8 skip[3];
> +	__u8 inter_mode[7][3];
> +	__u8 interp_filter[4][2];
> +	__u8 is_inter[4];
> +	__u8 comp_mode[5];
> +	__u8 single_ref[5][2];
> +	__u8 comp_ref[5];
> +	__u8 y_mode[4][9];
> +	__u8 uv_mode[10][9];
> +	__u8 partition[16][3];
> +
> +	struct v4l2_vp9_mv_compressed_hdr_probs mv;
> +};
> +
>  /* MPEG-compression definitions kept for backwards compatibility */
>  #ifndef __KERNEL__
>  #define V4L2_CTRL_CLASS_MPEG            V4L2_CTRL_CLASS_CODEC
> diff --git a/include/uapi/linux/videodev2.h b/include/uapi/linux/videodev2.h
> index 311a01cc5775..508e2d6825b1 100644
> --- a/include/uapi/linux/videodev2.h
> +++ b/include/uapi/linux/videodev2.h
> @@ -697,6 +697,7 @@ struct v4l2_pix_format {
>  #define V4L2_PIX_FMT_VP8      v4l2_fourcc('V', 'P', '8', '0') /* VP8 */
>  #define V4L2_PIX_FMT_VP8_FRAME v4l2_fourcc('V', 'P', '8', 'F') /* VP8 parsed frame */
>  #define V4L2_PIX_FMT_VP9      v4l2_fourcc('V', 'P', '9', '0') /* VP9 */
> +#define V4L2_PIX_FMT_VP9_FRAME v4l2_fourcc('V', 'P', '9', 'F') /* VP9 parsed frame */
>  #define V4L2_PIX_FMT_HEVC     v4l2_fourcc('H', 'E', 'V', 'C') /* HEVC aka H.265 */
>  #define V4L2_PIX_FMT_FWHT     v4l2_fourcc('F', 'W', 'H', 'T') /* Fast Walsh Hadamard Transform (vicodec) */
>  #define V4L2_PIX_FMT_FWHT_STATELESS     v4l2_fourcc('S', 'F', 'W', 'H') /* Stateless FWHT (vicodec) */
> @@ -1747,6 +1748,8 @@ struct v4l2_ext_control {
>  		struct v4l2_ctrl_h264_decode_params __user *p_h264_decode_params;
>  		struct v4l2_ctrl_fwht_params __user *p_fwht_params;
>  		struct v4l2_ctrl_vp8_frame __user *p_vp8_frame;
> +		struct v4l2_ctrl_vp9_compressed_hdr_probs __user *p_vp9_compressed_hdr_probs;
> +		struct v4l2_ctrl_vp9_frame_decode_params __user *p_vp9_frame_decode_params;
>  		void __user *ptr;
>  	};
>  } __attribute__ ((packed));
> @@ -1807,6 +1810,9 @@ enum v4l2_ctrl_type {
>  	V4L2_CTRL_TYPE_FWHT_PARAMS	    = 0x0220,
>  
>  	V4L2_CTRL_TYPE_VP8_FRAME            = 0x0240,
> +
> +	V4L2_CTRL_TYPE_VP9_COMPRESSED_HDR_PROBS	= 0x0260,
> +	V4L2_CTRL_TYPE_VP9_FRAME_DECODE_PARAMS	= 0x0261,
>  };
>  
>  /*  Used in the VIDIOC_QUERYCTRL ioctl for querying controls */
> 

Regards,

	Hans
Andrzej Pietrasiewicz April 30, 2021, 4:54 p.m. UTC | #2
Hi Hans,

Thank you for the review. I'm working on a v2 to address your comments.
Also please see inline.

Andrzej

W dniu 29.04.2021 o 12:20, Hans Verkuil pisze:
> On 21/04/2021 12:00, Andrzej Pietrasiewicz wrote:
>> Add the VP9 stateless decoder controls plus the documentation that goes
>> with it.
>>
>> Signed-off-by: Boris Brezillon <boris.brezillon@collabora.com>
>> Signed-off-by: Ezequiel Garcia <ezequiel@collabora.com>
>> Signed-off-by: Adrian Ratiu <adrian.ratiu@collabora.com>
>> Signed-off-by: Andrzej Pietrasiewicz <andrzej.p@collabora.com>
>> ---
>>   .../userspace-api/media/v4l/biblio.rst        |  10 +
>>   .../media/v4l/ext-ctrls-codec-stateless.rst   | 523 ++++++++++++++++++
>>   .../media/v4l/pixfmt-compressed.rst           |  15 +
>>   .../media/v4l/vidioc-g-ext-ctrls.rst          |   8 +
>>   .../media/v4l/vidioc-queryctrl.rst            |  12 +
>>   .../media/videodev2.h.rst.exceptions          |   2 +
>>   drivers/media/v4l2-core/v4l2-ctrls.c          | 244 ++++++++
>>   drivers/media/v4l2-core/v4l2-ioctl.c          |   1 +
>>   include/media/v4l2-ctrls.h                    |   4 +
>>   include/uapi/linux/v4l2-controls.h            | 455 +++++++++++++++
>>   include/uapi/linux/videodev2.h                |   6 +
>>   11 files changed, 1280 insertions(+)
>>
>> diff --git a/Documentation/userspace-api/media/v4l/biblio.rst b/Documentation/userspace-api/media/v4l/biblio.rst
>> index 64d241daf63c..051982896375 100644
>> --- a/Documentation/userspace-api/media/v4l/biblio.rst
>> +++ b/Documentation/userspace-api/media/v4l/biblio.rst
>> @@ -417,3 +417,13 @@ VP8
>>   :title:     RFC 6386: "VP8 Data Format and Decoding Guide"
>>   
>>   :author:    J. Bankoski et al.
>> +
>> +.. _vp9:
>> +
>> +VP9
>> +===
>> +
>> +
>> +:title:     VP9 Bitstream & Decoding Process Specification
>> +
>> +:author:    Adrian Grange (Google), Peter de Rivaz (Argon Design), Jonathan Hunt (Argon Design)
>> diff --git a/Documentation/userspace-api/media/v4l/ext-ctrls-codec-stateless.rst b/Documentation/userspace-api/media/v4l/ext-ctrls-codec-stateless.rst
>> index 3fc04daa9ffb..ab40c878c8ad 100644
>> --- a/Documentation/userspace-api/media/v4l/ext-ctrls-codec-stateless.rst
>> +++ b/Documentation/userspace-api/media/v4l/ext-ctrls-codec-stateless.rst
>> @@ -1244,3 +1244,526 @@ FWHT Flags
>>       * - __u8
>>         - ``padding[3]``
>>         - Applications and drivers must set this to zero.
>> +
>> +.. _v4l2-codec-stateless-vp9:
>> +
>> +``V4L2_CID_STATELESS_VP9_COMPRESSED_HDR_PROBS (struct)``
>> +    Stores VP9 probabilities updates as parsed from the current compressed frame
>> +    header. A value of zero in a struct member means no update of the relevant
>> +    probability. Motion vector-related updates contain a new value or zero. All
>> +    other updates contain values translated with inv_map_table[] (see 6.3.5 in
>> +    :ref:`vp9`).
>> +
>> +.. c:type:: v4l2_ctrl_vp9_compressed_hdr_probs
>> +
>> +.. cssclass:: longtable
>> +
>> +.. tabularcolumns:: |p{5.8cm}|p{4.8cm}|p{6.6cm}|
>> +
>> +.. flat-table:: struct v4l2_ctrl_vp9_compressed_hdr_probs
>> +    :header-rows:  0
>> +    :stub-columns: 0
>> +    :widths:       1 1 2
>> +
>> +    * - __u8
>> +      - ``tx8[2][1]``
>> +      - TX 8x8 probabilities delta.
>> +    * - __u8
>> +      - ``tx16[2][2]``
>> +      - TX 16x16 probabilities delta.
>> +    * - __u8
>> +      - ``tx32[2][3]``
>> +      - TX 32x32 probabilities delta.
>> +    * - __u8
>> +      - ``coef[4][2][2][6][6][3]``
>> +      - Coefficient probabilities delta.
>> +    * - __u8
>> +      - ``skip[3]``
>> +      - Skip probabilities delta.
>> +    * - __u8
>> +      - ``inter_mode[7][3]``
>> +      - Inter prediction mode probabilities delta.
>> +    * - __u8
>> +      - ``interp_filter[4][2]``
>> +      - Interpolation filter probabilities delta.
>> +    * - __u8
>> +      - ``is_inter[4]``
>> +      - Is inter-block probabilities delta.
>> +    * - __u8
>> +      - ``comp_mode[5]``
>> +      - Compound prediction mode probabilities delta.
>> +    * - __u8
>> +      - ``single_ref[5][2]``
>> +      - Single reference probabilities delta.
>> +    * - __u8
>> +      - ``comp_mode[5]``
>> +      - Compound reference probabilities delta.
>> +    * - __u8
>> +      - ``y_mode[4][9]``
>> +      - Y prediction mode probabilities delta.
>> +    * - __u8
>> +      - ``uv_mode[10][9]``
>> +      - UV prediction mode probabilities delta.
>> +    * - __u8
>> +      - ``partition[16][3]``
>> +      - Partition probabilities delta.
>> +    * - __u8
>> +      - ``partition[16][3]``
>> +      - Partition probabilities delta.
>> +    * - __u8
>> +      - ``mv.joint[3]``
>> +      - Motion vector joint probabilities delta.
>> +    * - __u8
>> +      - ``mv.sign[2]``
>> +      - Motion vector sign probabilities delta.
>> +    * - __u8
>> +      - ``mv.class[2][10]``
>> +      - Motion vector class probabilities delta.
>> +    * - __u8
>> +      - ``mv.class0_bit[2]``
>> +      - Motion vector class0 bit probabilities delta.
>> +    * - __u8
>> +      - ``mv.bits[2][10]``
>> +      - Motion vector bits probabilities delta.
>> +    * - __u8
>> +      - ``mv.class0_fr[2][2][3]``
>> +      - Motion vector class0 fractional bit probabilities delta.
>> +    * - __u8
>> +      - ``mv.fr[2][3]``
>> +      - Motion vector fractional bit probabilities delta.
>> +    * - __u8
>> +      - ``mv.class0_hp[2]``
>> +      - Motion vector class0 high precision fractional bit probabilities delta.
>> +    * - __u8
>> +      - ``mv.hp[2]``
>> +      - Motion vector high precision fractional bit probabilities delta.
>> +
>> +``V4L2_CID_STATELESS_VP9_FRAME_DECODE_PARAMS (struct)``
>> +    Specifies the frame parameters for the associated VP9 frame decode request.
>> +    This includes the necessary parameters for configuring a stateless hardware
>> +    decoding pipeline for VP9. The bitstream parameters are defined according
>> +    to :ref:`vp9`.
> 
> Are there specific sections in the spec that define these parameters? Or is it
> all over the place? If it's the latter, would it be possible to add a reference
> to the respective sections in the field documentation below?
> 
> Update: I noticed a lot of references to the spec in v4l2-controls.h. If those
> references would answer this question, then you can refer to that header from
> here. Or just copy those section references into this documentation.
> 
>> +
>> +    .. note::
>> +
>> +       This compound control is not yet part of the public kernel API and
>> +       it is expected to change.
> 
> Since this patch series add this to uAPI right away, this note must be dropped.
> 
>> +
>> +.. c:type:: v4l2_ctrl_vp9_frame_decode_params
>> +
>> +.. cssclass:: longtable
>> +
>> +.. tabularcolumns:: |p{1.5cm}|p{6.3cm}|p{9.4cm}|
>> +
>> +.. flat-table:: struct v4l2_ctrl_vp9_frame_decode_params
>> +    :header-rows:  0
>> +    :stub-columns: 0
>> +    :widths:       1 1 2
>> +
>> +    * - __u32
>> +      - ``flags``
>> +      - Combination of V4L2_VP9_FRAME_FLAG_* flags. See
>> +        :c:type:`v4l2_vp9_frame_flags`.
>> +    * - __u16
>> +      - ``compressed_header_size``
>> +      - Compressed header size in bytes.
>> +    * - __u16
>> +      - ``uncompressed_header_size``
>> +      - Uncompressed header size in bytes.
>> +    * - __u8
>> +      - ``profile``
>> +      - VP9 profile. Can be 0, 1, 2 or 3.
>> +    * - __u8
>> +      - ``reset_frame_context``
>> +      - Frame context that should be used/updated when decoding the frame.
>> +    * - __u8
>> +      - ``bit_depth``
>> +      - Component depth in bits. Must be 8 for profile 0 and 1. Must 10 or 12
>> +        for profile 2 and 3.
>> +    * - __u8
>> +      - ``interpolation_filter``
>> +      - Specifies the filter selection used for performing inter prediction. See
>> +        :c:type:`v4l2_vp9_interpolation_filter`.
>> +    * - __u8
>> +      - ``tile_cols_log2``
>> +      - Specifies the base 2 logarithm of the width of each tile (where the
>> +        width is measured in units of 8x8 blocks). Shall be less than or equal
>> +        to 6.
>> +    * - __u8
>> +      - ``tile_rows_log2``
>> +      - Specifies the base 2 logarithm of the height of each tile (where the
>> +        height is measured in units of 8x8 blocks)
> 
> Missing period at the end of the sentence.
> 
>> +    * - __u8
>> +      - ``tx_mode``
>> +      - Specifies the TX mode. See :c:type:`v4l2_vp9_tx_mode`.
>> +    * - __u8
>> +      - ``reference_mode``
>> +      - Specifies the type of inter prediction to be used. See
>> +        :c:type:`v4l2_vp9_reference_mode`.
>> +    * - __u8
>> +      - ``padding[7]``
>> +      - Needed to make this struct 64 bit aligned. Shall be filled with zeroes.
>> +    * - __u16
>> +      - ``frame_width_minus_1``
>> +      - Add 1 to get the frame width expressed in pixels.
>> +    * - __u16
>> +      - ``frame_height_minus_1``
>> +      - Add 1 to get the frame height expressed in pixels.
> 
> These two fields are weird. Isn't this defined by setting the output format?
> And why the 'minus_1'?
> 

These are values from the frame header, including the naming. The frame header
is parsed in software (by the CPU) and this data must be passed to the hardware.

>> +    * - __u16
>> +      - ``render_width_minus_1``
>> +      - Add 1 to get the expected render width expressed in pixels. This is
>> +        not used during the decoding process but might be used by HW scalers to
>> +        prepare a frame that's ready for scanout.
>> +    * - __u16
>> +      - render_height_minus_1
>> +      - Add 1 to get the expected render height expressed in pixels. This is
>> +        not used during the decoding process but might be used by HW scalers to
>> +        prepare a frame that's ready for scanout.
> 
> No idea what these fields are about. I suspect this can be defined by setting
> the capture format, but I'm not sure.

Ditto.

> 
>> +    * - __u64
>> +      - ``refs[3]``
>> +      - Array of reference frame timestamps.
>> +    * - __u8
>> +      - ``ref_frame_sign_bias[4]``
>> +      - Array of reference frames motion vector sign bias (prediction direction)
> 
> Missing period at the end.
> 
>> +    * - struct :c:type:`v4l2_vp9_loop_filter`
>> +      - ``lf``
>> +      - Loop filter parameters. See struct :c:type:`v4l2_vp9_loop_filter`.
>> +    * - struct :c:type:`v4l2_vp9_quantization`
>> +      - ``quant``
>> +      - Quantization parameters. See :c:type:`v4l2_vp9_quantization`.
>> +    * - struct :c:type:`v4l2_vp9_segmentation`
>> +      - ``seg``
>> +      - Segmentation parameters. See :c:type:`v4l2_vp9_segmentation`.
>> +    * - struct :c:type:`v4l2_vp9_probabilities`
>> +      - ``probs``
>> +      - Probabilities. See :c:type:`v4l2_vp9_probabilities`.
>> +
>> +.. c:type:: v4l2_vp9_frame_flags
>> +
>> +.. cssclass:: longtable
>> +
>> +.. tabularcolumns:: |p{1.5cm}|p{6.3cm}|p{9.4cm}|
>> +
>> +.. flat-table:: enum v4l2_vp9_frame_flags
>> +    :header-rows:  0
>> +    :stub-columns: 0
>> +    :widths:       1 2
>> +
>> +    * - ``V4L2_VP9_FRAME_FLAG_KEY_FRAME``
>> +      - The frame is a key frame.
>> +    * - ``V4L2_VP9_FRAME_FLAG_SHOW_FRAME``
>> +      - The frame should be displayed.
>> +    * - ``V4L2_VP9_FRAME_FLAG_ERROR_RESILIENT``
>> +      - The decoding should be error resilient.
>> +    * - ``V4L2_VP9_FRAME_FLAG_INTRA_ONLY``
>> +      - The frame does not reference other frames.
>> +    * - ``V4L2_VP9_FRAME_FLAG_ALLOW_HIGH_PREC_MV``
>> +      - the frame might can high precision motion vectors.
> 
> 'might can'? Should that be 'can use'?
> 
>> +    * - ``V4L2_VP9_FRAME_FLAG_REFRESH_FRAME_CTX``
>> +      - Frame context should be updated after decoding.
>> +    * - ``V4L2_VP9_FRAME_FLAG_PARALLEL_DEC_MODE``
>> +      - Parallel decoding is used.
>> +    * - ``V4L2_VP9_FRAME_FLAG_X_SUBSAMPLING``
>> +      - Vertical subsampling is enabled.
>> +    * - ``V4L2_VP9_FRAME_FLAG_Y_SUBSAMPLING``
>> +      - Horizontal subsampling is enabled.
>> +    * - ``V4L2_VP9_FRAME_FLAG_COLOR_RANGE_FULL_SWING``
>> +      - The full UV range is used.
>> +
>> +.. c:type:: v4l2_vp9_ref_id
>> +
>> +.. cssclass:: longtable
>> +
>> +.. tabularcolumns:: |p{1.5cm}|p{6.3cm}|p{9.4cm}|
>> +
>> +.. flat-table:: enum v4l2_vp9_ref_id
>> +    :header-rows:  0
>> +    :stub-columns: 0
>> +    :widths:       1 2
>> +
>> +    * - ``V4L2_REF_ID_LAST``
>> +      - Last reference frame.
>> +    * - ``V4L2_REF_ID_GOLDEN``
>> +      - Golden reference frame.
>> +    * - ``V4L2_REF_ID_ALTREF``
>> +      - Alternative reference frame.
>> +    * - ``V4L2_REF_ID_CNT``
>> +      - Number of reference frames.
>> +
>> +.. c:type:: v4l2_vp9_tx_mode
>> +
>> +.. cssclass:: longtable
>> +
>> +.. tabularcolumns:: |p{1.5cm}|p{6.3cm}|p{9.4cm}|
>> +
>> +.. flat-table:: enum v4l2_vp9_tx_mode
>> +    :header-rows:  0
>> +    :stub-columns: 0
>> +    :widths:       1 2
>> +
>> +    * - ``V4L2_VP9_TX_MODE_ONLY_4X4``
>> +      - Transform size is 4x4.
>> +    * - ``V4L2_VP9_TX_MODE_ALLOW_8X8``
>> +      - Transform size can be up to 8x8.
>> +    * - ``V4L2_VP9_TX_MODE_ALLOW_16X16``
>> +      - Transform size can be up to 16x16.
>> +    * - ``V4L2_VP9_TX_MODE_ALLOW_32X32``
>> +      - transform size can be up to 32x32.
>> +    * - ``V4L2_VP9_TX_MODE_SELECT``
>> +      - Bitstream contains transform size for each block.
> 
> Either 'contains the transform size' or 'contains transform sizes',
> whichever is appropriate.
> 
>> +
>> +.. c:type:: v4l2_vp9_reference_mode
>> +
>> +.. cssclass:: longtable
>> +
>> +.. tabularcolumns:: |p{1.5cm}|p{6.3cm}|p{9.4cm}|
>> +
>> +.. flat-table:: enum v4l2_vp9_reference_mode
>> +    :header-rows:  0
>> +    :stub-columns: 0
>> +    :widths:       1 2
>> +
>> +    * - ``V4L2_VP9_REF_MODE_SINGLE``
>> +      - Indicates that all the inter blocks use only a single reference frame
>> +        to generate motion compensated prediction.
>> +    * - ``V4L2_VP9_REF_MODE_COMPOUND``
>> +      - Requires all the inter blocks to use compound mode. Single reference
>> +        frame prediction is not allowed.
>> +    * - ``V4L2_VP9_REF_MODE_SELECT``
>> +      - Allows each individual inter block to select between single and
>> +        compound prediction modes.
>> +
>> +.. c:type:: v4l2_vp9_interpolation_filter
>> +
>> +.. cssclass:: longtable
>> +
>> +.. tabularcolumns:: |p{1.5cm}|p{6.3cm}|p{9.4cm}|
>> +
>> +.. flat-table:: enum v4l2_vp9_interpolation_filter
>> +    :header-rows:  0
>> +    :stub-columns: 0
>> +    :widths:       1 2
>> +
>> +    * - ``V4L2_VP9_INTERP_FILTER_8TAP``
>> +      - Height tap filter.
>> +    * - ``V4L2_VP9_INTERP_FILTER_8TAP_SMOOTH``
>> +      - Height tap smooth filter.
>> +    * - ``V4L2_VP9_INTERP_FILTER_8TAP_SHARP``
>> +      - Height tap sharp filter.
>> +    * - ``V4L2_VP9_INTERP_FILTER_BILINEAR``
>> +      - Bilinear filter.
>> +    * - ``V4L2_VP9_INTERP_FILTER_SWITCHABLE``
>> +      - Filter selection is signaled at the block level.
>> +
>> +.. c:type:: v4l2_vp9_reset_frame_context
>> +
>> +.. cssclass:: longtable
>> +
>> +.. tabularcolumns:: |p{1.5cm}|p{6.3cm}|p{9.4cm}|
>> +
>> +.. flat-table:: enum v4l2_vp9_reset_frame_context
>> +    :header-rows:  0
>> +    :stub-columns: 0
>> +    :widths:       1 2
>> +
>> +    * - ``V4L2_VP9_RESET_FRAME_CTX_NONE``
>> +      - Do not reset any frame context.
>> +    * - ``V4L2_VP9_RESET_FRAME_CTX_SPEC``
>> +      - Reset the frame context pointed by
> 
> pointed -> pointed to
> 
>> +        :c:type:`v4l2_ctrl_vp9_frame_decode_params`.frame_context_idx.
>> +    * - ``V4L2_VP9_RESET_FRAME_CTX_ALL``
>> +      - Reset all frame contexts.
>> +
>> +.. c:type:: v4l2_vp9_intra_prediction_mode
>> +
>> +.. cssclass:: longtable
>> +
>> +.. tabularcolumns:: |p{1.5cm}|p{6.3cm}|p{9.4cm}|
>> +
>> +.. flat-table:: enum v4l2_vp9_intra_prediction_mode
>> +    :header-rows:  0
>> +    :stub-columns: 0
>> +    :widths:       1 2
>> +
>> +    * - ``V4L2_VP9_INTRA_PRED_DC``
>> +      - DC intra prediction.
>> +    * - ``V4L2_VP9_INTRA_PRED_MODE_V``
>> +      - Vertical intra prediction.
>> +    * - ``V4L2_VP9_INTRA_PRED_MODE_H``
>> +      - Horizontal intra prediction.
>> +    * - ``V4L2_VP9_INTRA_PRED_MODE_D45``
>> +      - D45 intra prediction.
>> +    * - ``V4L2_VP9_INTRA_PRED_MODE_D135``
>> +      - D135 intra prediction.
>> +    * - ``V4L2_VP9_INTRA_PRED_MODE_D117``
>> +      - D117 intra prediction.
>> +    * - ``V4L2_VP9_INTRA_PRED_MODE_D153``
>> +      - D153 intra prediction.
>> +    * - ``V4L2_VP9_INTRA_PRED_MODE_D207``
>> +      - D207 intra prediction.
>> +    * - ``V4L2_VP9_INTRA_PRED_MODE_D63``
>> +      - D63 intra prediction.
>> +    * - ``V4L2_VP9_INTRA_PRED_MODE_TM``
>> +      - True motion intra prediction.
>> +
>> +.. c:type:: v4l2_vp9_segmentation
>> +
>> +.. cssclass:: longtable
>> +
>> +.. tabularcolumns:: |p{1.5cm}|p{6.3cm}|p{9.4cm}|
>> +
>> +.. flat-table:: struct v4l2_vp9_segmentation
>> +    :header-rows:  0
>> +    :stub-columns: 0
>> +    :widths:       1 1 2
>> +
>> +    * - __u8
>> +      - ``flags``
>> +      - Combination of V4L2_VP9_SEGMENTATION_FLAG_* flags. See
>> +        :c:type:`v4l2_vp9_segmentation_flags`.
>> +    * - __u8
>> +      - ``tree_probs[7]``
>> +      - Specifies the probability values to be used when decoding a Segment-ID.
>> +        See '5.15. Segmentation map' section of :ref:`vp9` for more details.
>> +    * - __u8
>> +      - ``pred_prob[3]``
>> +      - Specifies the probability values to be used when decoding a
>> +        Predicted-Segment-ID. See '6.4.14. Get segment id syntax'
>> +        section of :ref:`vp9` for more details.
>> +    * - __u8
>> +      - ``padding[5]``
>> +      - Used to align this struct on 64 bit. Shall be filled with zeroes.
> 
> I would prefer to have this at the end of the struct. In general I
> prefer padding at the end, not in the middle of a struct, if at all
> possible.

u8 + u8[7] + u8[3] is 11 bytes, then u8[5] makes it 16 bytes. The next chunk
then starts at a 64-bit boundary.

> 
>> +    * - __u8
>> +      - ``feature_enabled[8]``
>> +      - Bitmask defining which features are enabled in each segment.
>> +    * - __u8
>> +      - ``feature_data[8][4]``
>> +      - Data attached to each feature. Data entry is only valid if the feature
>> +        is enabled.
>> +
>> +.. c:type:: v4l2_vp9_segment_feature
>> +
>> +.. cssclass:: longtable
>> +
>> +.. tabularcolumns:: |p{1.5cm}|p{6.3cm}|p{9.4cm}|
>> +
>> +.. flat-table:: enum v4l2_vp9_segment_feature
>> +    :header-rows:  0
>> +    :stub-columns: 0
>> +    :widths:       1 2
>> +
>> +    * - ``V4L2_VP9_SEGMENT_FEATURE_QP_DELTA``
>> +      - QP delta segment feature.
>> +    * - ``V4L2_VP9_SEGMENT_FEATURE_LF``
>> +      - Loop filter segment feature.
>> +    * - ``V4L2_VP9_SEGMENT_FEATURE_REF_FRAME``
>> +      - Reference frame segment feature.
>> +    * - ``V4L2_VP9_SEGMENT_FEATURE_SKIP``
>> +      - Skip segment feature.
>> +    * - ``V4L2_VP9_SEGMENT_FEATURE_CNT``
>> +      - Number of segment features.
>> +
>> +.. c:type:: v4l2_vp9_segmentation_flags
>> +
>> +.. cssclass:: longtable
>> +
>> +.. tabularcolumns:: |p{1.5cm}|p{6.3cm}|p{9.4cm}|
>> +
>> +.. flat-table:: enum v4l2_vp9_segmentation_flags
>> +    :header-rows:  0
>> +    :stub-columns: 0
>> +    :widths:       1 2
>> +
>> +    * - ``V4L2_VP9_SEGMENTATION_FLAG_ENABLED``
>> +      - Indicates that this frame makes use of the segmentation tool.
>> +    * - ``V4L2_VP9_SEGMENTATION_FLAG_UPDATE_MAP``
>> +      - Indicates that the segmentation map should be updated during the
>> +        decoding of this frame.
>> +    * - ``V4L2_VP9_SEGMENTATION_FLAG_TEMPORAL_UPDATE``
>> +      - Indicates that the updates to the segmentation map are coded
>> +        relative to the existing segmentation map.
>> +    * - ``V4L2_VP9_SEGMENTATION_FLAG_UPDATE_DATA``
>> +      - Indicates that new parameters are about to be specified for each
>> +        segment.
>> +    * - ``V4L2_VP9_SEGMENTATION_FLAG_ABS_OR_DELTA_UPDATE``
>> +      - Indicates that the segmentation parameters represent the actual values
>> +        to be used.
>> +
>> +.. c:type:: v4l2_vp9_quantization
>> +
>> +.. cssclass:: longtable
>> +
>> +.. tabularcolumns:: |p{1.5cm}|p{6.3cm}|p{9.4cm}|
>> +
>> +.. flat-table:: struct v4l2_vp9_quantization
>> +    :header-rows:  0
>> +    :stub-columns: 0
>> +    :widths:       1 1 2
>> +
>> +    * - __u8
>> +      - ``base_q_idx``
>> +      - Indicates the base frame qindex.
>> +    * - __s8
>> +      - ``delta_q_y_dc``
>> +      - Indicates the Y DC quantizer relative to base_q_idx.
>> +    * - __s8
>> +      - ``delta_q_uv_dc``
>> +      - Indicates the UV DC quantizer relative to base_q_idx.
>> +    * - __s8
>> +      - ``delta_q_uv_ac``
>> +      - Indicates the UV AC quantizer relative to base_q_idx.
>> +    * - __u8
>> +      - ``padding[4]``
>> +      - Padding bytes used to align this struct on 64 bit. Must be set to 0.
>> +
>> +.. c:type:: v4l2_vp9_loop_filter
>> +
>> +.. cssclass:: longtable
>> +
>> +.. tabularcolumns:: |p{1.5cm}|p{6.3cm}|p{9.4cm}|
>> +
>> +.. flat-table:: struct v4l2_vp9_loop_filter
>> +    :header-rows:  0
>> +    :stub-columns: 0
>> +    :widths:       1 1 2
>> +
>> +    * - __u8
>> +      - ``flags``
>> +      - Combination of V4L2_VP9_LOOP_FILTER_FLAG_* flags.
>> +        See :c:type:`v4l2_vp9_loop_filter_flags`.
>> +    * - __u8
>> +      - ``level``
>> +      - Indicates the loop filter strength.
>> +    * - __u8
>> +      - ``sharpness``
>> +      - Indicates the sharpness level.
>> +    * - __s8
>> +      - ``ref_deltas[4]``
>> +      - Contains the adjustment needed for the filter level based on the chosen
>> +        reference frame.
>> +    * - __s8
>> +      - ``mode_deltas[2]``
>> +      - Contains the adjustment needed for the filter level based on the chosen
>> +        mode
>> +    * - __u8
>> +      - ``level_lookup[8][4][2]``
>> +      - Level lookup table.
>> +
>> +
>> +.. c:type:: v4l2_vp9_loop_filter_flags
>> +
>> +.. cssclass:: longtable
>> +
>> +.. tabularcolumns:: |p{1.5cm}|p{6.3cm}|p{9.4cm}|
>> +
>> +.. flat-table:: enum v4l2_vp9_loop_filter_flags
>> +    :header-rows:  0
>> +    :stub-columns: 0
>> +    :widths:       1 2
>> +
>> +    * - ``V4L2_VP9_LOOP_FILTER_FLAG_DELTA_ENABLED``
>> +      - When set, the filter level depends on the mode and reference frame used
>> +        to predict a block.
>> +    * - ``V4L2_VP9_LOOP_FILTER_FLAG_DELTA_UPDATE``
>> +      - When set, the bitstream contains additional syntax elements that
>> +        specify which mode and reference frame deltas are to be updated.
>> diff --git a/Documentation/userspace-api/media/v4l/pixfmt-compressed.rst b/Documentation/userspace-api/media/v4l/pixfmt-compressed.rst
>> index 6dba70da822b..7e34aeb1cb92 100644
>> --- a/Documentation/userspace-api/media/v4l/pixfmt-compressed.rst
>> +++ b/Documentation/userspace-api/media/v4l/pixfmt-compressed.rst
>> @@ -171,6 +171,21 @@ Compressed Formats
>>         - VP9 compressed video frame. The encoder generates one
>>   	compressed frame per buffer, and the decoder requires one
>>   	compressed frame per buffer.
>> +    * .. _V4L2-PIX-FMT-VP9_FRAME:
>> +
>> +      - ``V4L2_PIX_FMT_VP9_FRAME``
>> +      - 'VP9F'
>> +      - VP9 parsed frame, including the frame header, as extracted from the container.
>> +	This format is adapted for stateless video decoders that implement an
> 
> an -> a
> 
>> +	VP9 pipeline with the :ref:`stateless_decoder`.
>> +	Metadata associated with the frame to decode is required to be passed
>> +	through the ``V4L2_CID_STATELESS_VP9_FRAME_DECODE_PARAMS`` and
>> +	the ``V4L2_CID_STATELESS_VP9_COMPRESSED_HDR_PROBS`` controls.
>> +	See the :ref:`associated Codec Control IDs <v4l2-codec-stateless-vp9>`.
>> +	Exactly one output and one capture buffer must be provided for use with
>> +	this pixel format. The output buffer must contain the appropriate number
>> +	of macroblocks to decode a full corresponding frame to the matching
>> +	capture buffer.
>>       * .. _V4L2-PIX-FMT-HEVC:
>>   
>>         - ``V4L2_PIX_FMT_HEVC``
>> diff --git a/Documentation/userspace-api/media/v4l/vidioc-g-ext-ctrls.rst b/Documentation/userspace-api/media/v4l/vidioc-g-ext-ctrls.rst
>> index 3ba22983d21f..3ff72ca63772 100644
>> --- a/Documentation/userspace-api/media/v4l/vidioc-g-ext-ctrls.rst
>> +++ b/Documentation/userspace-api/media/v4l/vidioc-g-ext-ctrls.rst
>> @@ -221,6 +221,14 @@ still cause this situation.
>>         - ``p_vp8_frame``
>>         - A pointer to a struct :c:type:`v4l2_ctrl_vp8_frame`. Valid if this control is
>>           of type ``V4L2_CTRL_TYPE_VP8_FRAME``.
>> +    * - struct :c:type:`v4l2_ctrl_vp9_compressed_hdr_probs` *
>> +      - ``p_vp9_compressed_hdr_probs``
>> +      - A pointer to a struct :c:type:`v4l2_ctrl_vp9_compressed_hdr_probs'. Valid if this contro is
> 
> contro -> control
> 
>> +        of type ``V4L2_CTRL_TYPE_VP9_COMPRESSED_HDR_PROBS``.
>> +    * - struct :c:type:`v4l2_ctrl_vp9_frame_decode_params` *
>> +      - ``p_vp9_frame_decode_params``
>> +      - A pointer to a struct :c:type:`v4l2_ctrl_vp9_frame_decode_params'. Valid if this contro is
> 
> ditto
> 
>> +        of type ``V4L2_CTRL_TYPE_VP9_FRAME_DECODE_PARAMS``.
>>       * - struct :c:type:`v4l2_ctrl_hdr10_cll_info` *
>>         - ``p_hdr10_cll``
>>         - A pointer to a struct :c:type:`v4l2_ctrl_hdr10_cll_info`. Valid if this control is
>> diff --git a/Documentation/userspace-api/media/v4l/vidioc-queryctrl.rst b/Documentation/userspace-api/media/v4l/vidioc-queryctrl.rst
>> index 8a285daedc6a..85fb8b7a9428 100644
>> --- a/Documentation/userspace-api/media/v4l/vidioc-queryctrl.rst
>> +++ b/Documentation/userspace-api/media/v4l/vidioc-queryctrl.rst
>> @@ -495,6 +495,18 @@ See also the examples in :ref:`control`.
>>         - n/a
>>         - A struct :c:type:`v4l2_ctrl_vp8_frame`, containing VP8
>>   	frame parameters for stateless video decoders.
>> +    * - ``V4L2_CTRL_TYPE_VP9_COMPRESSED_HDR_PROBS``
>> +      - n/a
>> +      - n/a
>> +      - n/a
>> +      - A struct :c:type:`v4l2_ctrl_vp9_compressed_hdr_probs`, containing VP9
>> +	probabilities updates for stateless video decoders.
>> +    * - ``V4L2_CTRL_TYPE_VP9_FRAME_DECODE_PARAMS``
>> +      - n/a
>> +      - n/a
>> +      - n/a
>> +      - A struct :c:type:`v4l2_ctrl_vp9_compressed_hdr_probs`, containing VP9
> 
> v4l2_ctrl_vp9_compressed_hdr_probs -> v4l2_ctrl_vp9_frame_decode_params
> 
>> +	frame decode parameters for stateless video decoders.
>>   
>>   .. raw:: latex
>>   
>> diff --git a/Documentation/userspace-api/media/videodev2.h.rst.exceptions b/Documentation/userspace-api/media/videodev2.h.rst.exceptions
>> index f59940352faa..fdc6f2b22df8 100644
>> --- a/Documentation/userspace-api/media/videodev2.h.rst.exceptions
>> +++ b/Documentation/userspace-api/media/videodev2.h.rst.exceptions
>> @@ -148,6 +148,8 @@ replace symbol V4L2_CTRL_TYPE_HEVC_SLICE_PARAMS :c:type:`v4l2_ctrl_type`
>>   replace symbol V4L2_CTRL_TYPE_AREA :c:type:`v4l2_ctrl_type`
>>   replace symbol V4L2_CTRL_TYPE_FWHT_PARAMS :c:type:`v4l2_ctrl_type`
>>   replace symbol V4L2_CTRL_TYPE_VP8_FRAME :c:type:`v4l2_ctrl_type`
>> +replace symbol V4L2_CTRL_TYPE_VP9_COMPRESSED_HDR_PROBS :c:type:`v4l2_ctrl_type`
>> +replace symbol V4L2_CTRL_TYPE_VP9_FRAME_DECODE_PARAMS :c:type:`v4l2_ctrl_type`
>>   replace symbol V4L2_CTRL_TYPE_HDR10_CLL_INFO :c:type:`v4l2_ctrl_type`
>>   replace symbol V4L2_CTRL_TYPE_HDR10_MASTERING_DISPLAY :c:type:`v4l2_ctrl_type`
>>   
>> diff --git a/drivers/media/v4l2-core/v4l2-ctrls.c b/drivers/media/v4l2-core/v4l2-ctrls.c
>> index 0d7fe1bd975a..8de7238593ab 100644
>> --- a/drivers/media/v4l2-core/v4l2-ctrls.c
>> +++ b/drivers/media/v4l2-core/v4l2-ctrls.c
>> @@ -1215,6 +1215,8 @@ const char *v4l2_ctrl_get_name(u32 id)
>>   	case V4L2_CID_STATELESS_H264_DECODE_PARAMS:		return "H264 Decode Parameters";
>>   	case V4L2_CID_STATELESS_FWHT_PARAMS:			return "FWHT Stateless Parameters";
>>   	case V4L2_CID_STATELESS_VP8_FRAME:			return "VP8 Frame Parameters";
>> +	case V4L2_CID_STATELESS_VP9_COMPRESSED_HDR_PROBS:	return "VP9 Probabilities Updates";
>> +	case V4L2_CID_STATELESS_VP9_FRAME_DECODE_PARAMS:	return "VP9 Frame Decode Parameters";
>>   
>>   	/* Colorimetry controls */
>>   	/* Keep the order of the 'case's the same as in v4l2-controls.h! */
>> @@ -1517,6 +1519,12 @@ void v4l2_ctrl_fill(u32 id, const char **name, enum v4l2_ctrl_type *type,
>>   	case V4L2_CID_STATELESS_VP8_FRAME:
>>   		*type = V4L2_CTRL_TYPE_VP8_FRAME;
>>   		break;
>> +	case V4L2_CID_STATELESS_VP9_FRAME_DECODE_PARAMS:
>> +		*type = V4L2_CTRL_TYPE_VP9_FRAME_DECODE_PARAMS;
>> +		break;
>> +	case V4L2_CID_STATELESS_VP9_COMPRESSED_HDR_PROBS:
>> +		*type = V4L2_CTRL_TYPE_VP9_COMPRESSED_HDR_PROBS;
>> +		break;
> 
> Let's swap the order of these two cases. Everywhere else it seems that
> PROBS comes before DECODE_PARARMS, so stay consistent.
> 
>>   	case V4L2_CID_MPEG_VIDEO_HEVC_SPS:
>>   		*type = V4L2_CTRL_TYPE_HEVC_SPS;
>>   		break;
>> @@ -1836,6 +1844,12 @@ static void std_log(const struct v4l2_ctrl *ctrl)
>>   	case V4L2_CTRL_TYPE_VP8_FRAME:
>>   		pr_cont("VP8_FRAME");
>>   		break;
>> +	case V4L2_CTRL_TYPE_VP9_COMPRESSED_HDR_PROBS:
>> +		pr_cont("VP9_COMPRESSED_HDR_PROBS");
>> +		break;
>> +	case V4L2_CTRL_TYPE_VP9_FRAME_DECODE_PARAMS:
>> +		pr_cont("VP9_FRAME_DECODE_PARAMS");
>> +		break;
>>   	case V4L2_CTRL_TYPE_HDR10_CLL_INFO:
>>   		pr_cont("HDR10_CLL_INFO");
>>   		break;
>> @@ -1869,6 +1883,224 @@ static void std_log(const struct v4l2_ctrl *ctrl)
>>   	0;							\
>>   })
>>   
>> +static int
>> +validate_vp9_lf_params(struct v4l2_vp9_loop_filter *lf)
>> +{
>> +	unsigned int i, j, k;
>> +
>> +	if (lf->flags &
>> +	    ~(V4L2_VP9_LOOP_FILTER_FLAG_DELTA_ENABLED |
>> +	      V4L2_VP9_LOOP_FILTER_FLAG_DELTA_UPDATE))
> 
> This is more readable because it is clearer that you are
> checking flags against invalid bits:
> 
> 	if (lf->flags & ~(V4L2_VP9_LOOP_FILTER_FLAG_DELTA_ENABLED |
> 			  V4L2_VP9_LOOP_FILTER_FLAG_DELTA_UPDATE))
> 
> There are similar cases like this further down, do the same there
> unless you get lines that are too long.
> 
>> +		return -EINVAL;
>> +
>> +	/*
>> +	 * V4L2_VP9_LOOP_FILTER_FLAG_DELTA_ENABLED implies
>> +	 * V4L2_VP9_LOOP_FILTER_FLAG_DELTA_UPDATE.
>> +	 */
>> +	if (lf->flags & V4L2_VP9_LOOP_FILTER_FLAG_DELTA_UPDATE &&
>> +	    !(lf->flags & V4L2_VP9_LOOP_FILTER_FLAG_DELTA_ENABLED))
>> +		return -EINVAL;
>> +
>> +	/* That all values are in the accepted range. */
>> +	if (lf->level > GENMASK(5, 0))
>> +		return -EINVAL;
>> +
>> +	if (lf->sharpness > GENMASK(2, 0))
>> +		return -EINVAL;
>> +
>> +	for (i = 0; i < ARRAY_SIZE(lf->ref_deltas); i++) {
> 
> You can drop { here.
> 
>> +		if (lf->ref_deltas[i] < -63 || lf->ref_deltas[i] > 63)
>> +			return -EINVAL;
>> +	}
>> +
>> +	for (i = 0; i < ARRAY_SIZE(lf->mode_deltas); i++) {
> 
> ditto
> 
>> +		if (lf->mode_deltas[i] < -63 || lf->mode_deltas[i] > 63)
>> +			return -EINVAL;
>> +	}
>> +
>> +	for (i = 0; i < ARRAY_SIZE(lf->level_lookup); i++) {
> 
> ditto
> 
>> +		for (j = 0; j < ARRAY_SIZE(lf->level_lookup[0]); j++) {
> 
> ditto
> 
>> +			for (k = 0; k < ARRAY_SIZE(lf->level_lookup[0][0]); k++) {
> 
> ditto
> 
>> +				if (lf->level_lookup[i][j][k] > 63)
>> +					return -EINVAL;
>> +			}
>> +		}
>> +	}
>> +
>> +	return 0;
>> +}
>> +
>> +static int
>> +validate_vp9_quant_params(struct v4l2_vp9_quantization *quant)
>> +{
>> +	if (quant->delta_q_y_dc < -15 || quant->delta_q_y_dc > 15 ||
>> +	    quant->delta_q_uv_dc < -15 || quant->delta_q_uv_dc > 15 ||
>> +	    quant->delta_q_uv_ac < -15 || quant->delta_q_uv_ac > 15)
>> +		return -EINVAL;
>> +
>> +	memset(quant->padding, 0, sizeof(quant->padding));
> 
> Use the zero_padding macro for this. Check other occurrence of this.
> 
>> +	return 0;
>> +}
>> +
>> +static int
>> +validate_vp9_seg_params(struct v4l2_vp9_segmentation *seg)
>> +{
>> +	unsigned int i, j;
>> +
>> +	if (seg->flags &
>> +	    ~(V4L2_VP9_SEGMENTATION_FLAG_ENABLED |
>> +	      V4L2_VP9_SEGMENTATION_FLAG_UPDATE_MAP |
>> +	      V4L2_VP9_SEGMENTATION_FLAG_TEMPORAL_UPDATE |
>> +	      V4L2_VP9_SEGMENTATION_FLAG_UPDATE_DATA |
>> +	      V4L2_VP9_SEGMENTATION_FLAG_ABS_OR_DELTA_UPDATE))
>> +		return -EINVAL;
>> +
>> +	/*
>> +	 * V4L2_VP9_SEGMENTATION_FLAG_UPDATE_MAP and
>> +	 * V4L2_VP9_SEGMENTATION_FLAG_UPDATE_DATA imply
>> +	 * V4L2_VP9_SEGMENTATION_FLAG_ENABLED.
>> +	 */
>> +	if ((seg->flags &
>> +	     (V4L2_VP9_SEGMENTATION_FLAG_UPDATE_MAP |
>> +	      V4L2_VP9_SEGMENTATION_FLAG_UPDATE_DATA)) &&
>> +	    !(seg->flags & V4L2_VP9_SEGMENTATION_FLAG_ENABLED))
>> +		return -EINVAL;
>> +
>> +	/*
>> +	 * V4L2_VP9_SEGMENTATION_FLAG_TEMPORAL_UPDATE implies
>> +	 * V4L2_VP9_SEGMENTATION_FLAG_UPDATE_MAP.
>> +	 */
>> +	if (seg->flags & V4L2_VP9_SEGMENTATION_FLAG_TEMPORAL_UPDATE &&
>> +	    !(seg->flags & V4L2_VP9_SEGMENTATION_FLAG_UPDATE_MAP))
>> +		return -EINVAL;
>> +
>> +	/*
>> +	 * V4L2_VP9_SEGMENTATION_FLAG_ABS_OR_DELTA_UPDATE implies
>> +	 * V4L2_VP9_SEGMENTATION_FLAG_UPDATE_DATA.
>> +	 */
>> +	if (seg->flags & V4L2_VP9_SEGMENTATION_FLAG_ABS_OR_DELTA_UPDATE &&
>> +	    !(seg->flags & V4L2_VP9_SEGMENTATION_FLAG_UPDATE_DATA))
>> +		return -EINVAL;
>> +
>> +	for (i = 0; i < ARRAY_SIZE(seg->feature_enabled); i++) {
>> +		if (seg->feature_enabled[i] &
>> +		    ~(V4L2_VP9_SEGMENT_FEATURE_QP_DELTA |
>> +		      V4L2_VP9_SEGMENT_FEATURE_LF |
>> +		      V4L2_VP9_SEGMENT_FEATURE_REF_FRAME |
>> +		      V4L2_VP9_SEGMENT_FEATURE_SKIP))
>> +			return -EINVAL;
>> +	}
>> +
>> +	for (i = 0; i < ARRAY_SIZE(seg->feature_data); i++) {
>> +		const int range[] = {255, 63, 3, 0};
> 
> Space after/before { and }.
> 
>> +
>> +		for (j = 0; j < ARRAY_SIZE(seg->feature_data[j]); j++) {
>> +			if (seg->feature_data[i][j] < -range[j] ||
>> +			    seg->feature_data[i][j] > range[j])
>> +				return -EINVAL;
>> +		}
>> +	}
>> +
>> +	memset(seg->padding, 0, sizeof(seg->padding));
>> +	return 0;
>> +}
>> +
>> +static int
>> +validate_vp9_frame_decode_params(struct v4l2_ctrl_vp9_frame_decode_params *dec_params)
>> +{
>> +	int ret, i;
>> +
>> +	/* Make sure we're not passed invalid flags. */
>> +	if (dec_params->flags &
>> +	    ~(V4L2_VP9_FRAME_FLAG_KEY_FRAME |
>> +	      V4L2_VP9_FRAME_FLAG_SHOW_FRAME |
>> +	      V4L2_VP9_FRAME_FLAG_ERROR_RESILIENT |
>> +	      V4L2_VP9_FRAME_FLAG_INTRA_ONLY |
>> +	      V4L2_VP9_FRAME_FLAG_ALLOW_HIGH_PREC_MV |
>> +	      V4L2_VP9_FRAME_FLAG_REFRESH_FRAME_CTX |
>> +	      V4L2_VP9_FRAME_FLAG_PARALLEL_DEC_MODE |
>> +	      V4L2_VP9_FRAME_FLAG_X_SUBSAMPLING |
>> +	      V4L2_VP9_FRAME_FLAG_Y_SUBSAMPLING |
>> +	      V4L2_VP9_FRAME_FLAG_COLOR_RANGE_FULL_SWING))
>> +		return -EINVAL;
>> +
>> +	/*
>> +	 * The refresh context and error resilient flags are mutually exclusive.
>> +	 * Same goes for parallel decoding and error resilient modes.
>> +	 */
>> +	if (dec_params->flags & V4L2_VP9_FRAME_FLAG_ERROR_RESILIENT &&
>> +	    dec_params->flags &
>> +	    (V4L2_VP9_FRAME_FLAG_REFRESH_FRAME_CTX |
>> +	     V4L2_VP9_FRAME_FLAG_PARALLEL_DEC_MODE))
>> +		return -EINVAL;
>> +
>> +	if (dec_params->profile > V4L2_VP9_PROFILE_MAX)
>> +		return -EINVAL;
>> +
>> +	if (dec_params->reset_frame_context > V4L2_VP9_RESET_FRAME_CTX_ALL)
>> +		return -EINVAL;
>> +
>> +	if (dec_params->frame_context_idx >= V4L2_VP9_NUM_FRAME_CTX)
>> +		return -EINVAL;
>> +
>> +	/*
>> +	 * Profiles 0 and 1 only support 8-bit depth, profiles 2 and 3 only 10
>> +	 * and 12 bit depths.
>> +	 */
>> +	if ((dec_params->profile < 2 && dec_params->bit_depth != 8) ||
>> +	    (dec_params->profile >= 2 &&
>> +	     (dec_params->bit_depth != 10 && dec_params->bit_depth != 12)))
>> +		return -EINVAL;
>> +
>> +	/* Profile 0 and 2 only accept YUV 4:2:0. */
>> +	if ((dec_params->profile == 0 || dec_params->profile == 2) &&
>> +	    (!(dec_params->flags & V4L2_VP9_FRAME_FLAG_X_SUBSAMPLING) ||
>> +	     !(dec_params->flags & V4L2_VP9_FRAME_FLAG_Y_SUBSAMPLING)))
>> +		return -EINVAL;
>> +
>> +	/* Profile 1 and 3 only accept YUV 4:2:2, 4:4:0 and 4:4:4. */
>> +	if ((dec_params->profile == 1 || dec_params->profile == 3) &&
>> +	    ((dec_params->flags & V4L2_VP9_FRAME_FLAG_X_SUBSAMPLING) &&
>> +	     (dec_params->flags & V4L2_VP9_FRAME_FLAG_Y_SUBSAMPLING)))
>> +		return -EINVAL;
>> +
>> +	if (dec_params->interpolation_filter > V4L2_VP9_INTERP_FILTER_SWITCHABLE)
>> +		return -EINVAL;
>> +
>> +	/*
>> +	 * According to the spec, tile_cols_log2 shall be less than or equal
>> +	 * to 6.
>> +	 */
>> +	if (dec_params->tile_cols_log2 > 6)
>> +		return -EINVAL;
>> +
>> +	if (dec_params->tx_mode > V4L2_VP9_TX_MODE_SELECT)
>> +		return -EINVAL;
>> +
>> +	if (dec_params->reference_mode > V4L2_VP9_REF_MODE_SELECT)
>> +		return -EINVAL;
>> +
>> +	for (i = 0; i < V4L2_REF_ID_CNT + 1; ++i)
>> +		if (dec_params->ref_frame_sign_bias[i] != 0 &&
>> +		    dec_params->ref_frame_sign_bias[i] != 1)
>> +			return -EINVAL;
>> +
>> +	ret = validate_vp9_lf_params(&dec_params->lf);
>> +	if (ret)
>> +		return ret;
>> +
>> +	ret = validate_vp9_quant_params(&dec_params->quant);
>> +	if (ret)
>> +		return ret;
>> +
>> +	ret = validate_vp9_seg_params(&dec_params->seg);
>> +	if (ret)
>> +		return ret;
>> +
>> +	memset(dec_params->padding, 0, sizeof(dec_params->padding));
>> +	return 0;
>> +}
>> +
>>   /* Validate a new control */
>>   
>>   #define zero_padding(s) \
>> @@ -2127,6 +2359,12 @@ static int std_validate_compound(const struct v4l2_ctrl *ctrl, u32 idx,
>>   		zero_padding(p_vp8_frame->coder_state);
>>   		break;
>>   
>> +	case V4L2_CTRL_TYPE_VP9_FRAME_DECODE_PARAMS:
>> +		return validate_vp9_frame_decode_params(p);
>> +
>> +	case V4L2_CTRL_TYPE_VP9_COMPRESSED_HDR_PROBS:
>> +		break;
>> +
>>   	case V4L2_CTRL_TYPE_HEVC_SPS:
>>   		p_hevc_sps = p;
>>   
>> @@ -2938,6 +3176,12 @@ static struct v4l2_ctrl *v4l2_ctrl_new(struct v4l2_ctrl_handler *hdl,
>>   	case V4L2_CTRL_TYPE_VP8_FRAME:
>>   		elem_size = sizeof(struct v4l2_ctrl_vp8_frame);
>>   		break;
>> +	case V4L2_CTRL_TYPE_VP9_COMPRESSED_HDR_PROBS:
>> +		elem_size = sizeof(struct v4l2_ctrl_vp9_compressed_hdr_probs);
>> +		break;
>> +	case V4L2_CTRL_TYPE_VP9_FRAME_DECODE_PARAMS:
>> +		elem_size = sizeof(struct v4l2_ctrl_vp9_frame_decode_params);
>> +		break;
>>   	case V4L2_CTRL_TYPE_HEVC_SPS:
>>   		elem_size = sizeof(struct v4l2_ctrl_hevc_sps);
>>   		break;
>> diff --git a/drivers/media/v4l2-core/v4l2-ioctl.c b/drivers/media/v4l2-core/v4l2-ioctl.c
>> index 6a5d1c6d11d6..dbdafa5ea127 100644
>> --- a/drivers/media/v4l2-core/v4l2-ioctl.c
>> +++ b/drivers/media/v4l2-core/v4l2-ioctl.c
>> @@ -1431,6 +1431,7 @@ static void v4l_fill_fmtdesc(struct v4l2_fmtdesc *fmt)
>>   		case V4L2_PIX_FMT_VP8:		descr = "VP8"; break;
>>   		case V4L2_PIX_FMT_VP8_FRAME:    descr = "VP8 Frame"; break;
>>   		case V4L2_PIX_FMT_VP9:		descr = "VP9"; break;
>> +		case V4L2_PIX_FMT_VP9_FRAME:    descr = "VP9 Frame"; break;
>>   		case V4L2_PIX_FMT_HEVC:		descr = "HEVC"; break; /* aka H.265 */
>>   		case V4L2_PIX_FMT_HEVC_SLICE:	descr = "HEVC Parsed Slice Data"; break;
>>   		case V4L2_PIX_FMT_FWHT:		descr = "FWHT"; break; /* used in vicodec */
>> diff --git a/include/media/v4l2-ctrls.h b/include/media/v4l2-ctrls.h
>> index a5953b812878..8c5fb22ff545 100644
>> --- a/include/media/v4l2-ctrls.h
>> +++ b/include/media/v4l2-ctrls.h
>> @@ -50,6 +50,8 @@ struct video_device;
>>    * @p_h264_decode_params:	Pointer to a struct v4l2_ctrl_h264_decode_params.
>>    * @p_h264_pred_weights:	Pointer to a struct v4l2_ctrl_h264_pred_weights.
>>    * @p_vp8_frame:		Pointer to a VP8 frame params structure.
>> + * @p_vp9_compressed_hdr_probs:	Pointer to a VP9 frame compressed header probs structure.
>> + * @p_vp9_frame_decode_params:	Pointer to a VP9 frame params structure.
> 
> Why is this called p_vp9_frame_decode_params while for VP8 it is called
> p_vp8_frame? The mismatch is odd. This comment is of course about the general
> naming of this control, not just this fiel
If that's preferred, it will be changed in v2.

> 
>>    * @p_hevc_sps:			Pointer to an HEVC sequence parameter set structure.
>>    * @p_hevc_pps:			Pointer to an HEVC picture parameter set structure.
>>    * @p_hevc_slice_params:	Pointer to an HEVC slice parameters structure.
>> @@ -79,6 +81,8 @@ union v4l2_ctrl_ptr {
>>   	struct v4l2_ctrl_hevc_sps *p_hevc_sps;
>>   	struct v4l2_ctrl_hevc_pps *p_hevc_pps;
>>   	struct v4l2_ctrl_hevc_slice_params *p_hevc_slice_params;
>> +	struct v4l2_ctrl_vp9_compressed_hdr_probs *p_vp9_compressed_hdr_probs;
>> +	struct v4l2_ctrl_vp9_frame_decode_params *p_vp9_frame_decode_params;
>>   	struct v4l2_ctrl_hdr10_cll_info *p_hdr10_cll;
>>   	struct v4l2_ctrl_hdr10_mastering_display *p_hdr10_mastering;
>>   	struct v4l2_area *p_area;
>> diff --git a/include/uapi/linux/v4l2-controls.h b/include/uapi/linux/v4l2-controls.h
>> index d43bec5f1afd..ff5c574f2755 100644
>> --- a/include/uapi/linux/v4l2-controls.h
>> +++ b/include/uapi/linux/v4l2-controls.h
>> @@ -1896,6 +1896,461 @@ struct v4l2_ctrl_hdr10_mastering_display {
>>   	__u32 min_display_mastering_luminance;
>>   };
>>   
>> +/* Stateless VP9 control */
> 
> control -> controls
> 
>> +
>> +/**
>> + * enum v4l2_vp9_loop_filter_flags - VP9 loop filter flags
>> + *
>> + * @V4L2_VP9_LOOP_FILTER_FLAG_DELTA_ENABLED: the filter level depends on
>> + *					     the mode and reference frame used
>> + *					     to predict a block
>> + * @V4L2_VP9_LOOP_FILTER_FLAG_DELTA_UPDATE: the bitstream contains additional
>> + *					    syntax elements that specify which
>> + *					    mode and reference frame deltas
>> + *					    are to be updated
>> + *
>> + * Those are the flags you should pass to &v4l2_vp9_loop_filter.flags. See
>> + * section '7.2.8 Loop filter semantics' of the VP9 specification for more
>> + * details.
>> + */
>> +enum v4l2_vp9_loop_filter_flags {
>> +	V4L2_VP9_LOOP_FILTER_FLAG_DELTA_ENABLED = 1 << 0,
>> +	V4L2_VP9_LOOP_FILTER_FLAG_DELTA_UPDATE = 1 << 1,
>> +};
>> +
>> +/**
>> + * struct v4l2_vp9_loop_filter - VP9 loop filter parameters
>> + *
>> + * @flags: combination of V4L2_VP9_LOOP_FILTER_FLAG_* flags
>> + * @level: indicates the loop filter strength
>> + * @sharpness: indicates the sharpness level
>> + * @ref_deltas: contains the adjustment needed for the filter level based on
>> + *		the chosen reference frame
>> + * @mode_deltas: contains the adjustment needed for the filter level based on
>> + *		 the chosen mode
>> + * @level_lookup: level lookup table
>> + *
>> + * This structure contains all loop filter related parameters. See sections
>> + * '7.2.8 Loop filter semantics' and '8.8.1 Loop filter frame init process'
>> + * of the VP9 specification for more details.
>> + */
>> +struct v4l2_vp9_loop_filter {
>> +	__u8 flags;
>> +	__u8 level;
>> +	__u8 sharpness;
>> +	__s8 ref_deltas[4];
>> +	__s8 mode_deltas[2];
>> +	__u8 level_lookup[8][4][2];
>> +	__u8 padding;
>> +};
>> +
>> +/**
>> + * struct v4l2_vp9_quantization - VP9 quantization parameters
>> + *
>> + * @base_q_idx: indicates the base frame qindex
>> + * @delta_q_y_dc: indicates the Y DC quantizer relative to base_q_idx
>> + * @delta_q_uv_dc: indicates the UV DC quantizer relative to base_q_idx
>> + * @delta_q_uv_ac indicates the UV AC quantizer relative to base_q_idx
>> + * @padding: padding bytes to align things on 64 bits. Must be set to 0
>> + *
>> + * Encodes the quantization parameters. See section '7.2.9 Quantization params
>> + * syntax' of the VP9 specification for more details.
>> + */
>> +struct v4l2_vp9_quantization {
>> +	__u8 base_q_idx;
>> +	__s8 delta_q_y_dc;
>> +	__s8 delta_q_uv_dc;
>> +	__s8 delta_q_uv_ac;
>> +	__u8 padding[4];
>> +};
>> +
>> +/**
>> + * enum v4l2_vp9_segmentation_flags - VP9 segmentation flags
>> + *
>> + * @V4L2_VP9_SEGMENTATION_FLAG_ENABLED: indicates that this frame makes use of
>> + *					the segmentation tool
> 
> Don't indent so far to the right. In case like this you just add a single TAB
> after the *. Same elsewhere.
> 
>> + * @V4L2_VP9_SEGMENTATION_FLAG_UPDATE_MAP: indicates that the segmentation map
>> + *					   should be updated during the
>> + *					   decoding of this frame
>> + * @V4L2_VP9_SEGMENTATION_FLAG_TEMPORAL_UPDATE: indicates that the updates to
>> + *						the segmentation map are coded
>> + *						relative to the existing
>> + *						segmentation map
>> + * @V4L2_VP9_SEGMENTATION_FLAG_UPDATE_DATA: indicates that new parameters are
>> + *					    about to be specified for each
>> + *					    segment
>> + * @V4L2_VP9_SEGMENTATION_FLAG_ABS_OR_DELTA_UPDATE: indicates that the
>> + *						    segmentation parameters
>> + *						    represent the actual values
>> + *						    to be used
>> + *
>> + * Those are the flags you should pass to &v4l2_vp9_segmentation.flags. See
>> + * section '7.2.10 Segmentation params syntax' of the VP9 specification for
>> + * more details.
>> + */
>> +enum v4l2_vp9_segmentation_flags {
>> +	V4L2_VP9_SEGMENTATION_FLAG_ENABLED = 1 << 0,
>> +	V4L2_VP9_SEGMENTATION_FLAG_UPDATE_MAP = 1 << 1,
>> +	V4L2_VP9_SEGMENTATION_FLAG_TEMPORAL_UPDATE = 1 << 2,
>> +	V4L2_VP9_SEGMENTATION_FLAG_UPDATE_DATA = 1 << 3,
>> +	V4L2_VP9_SEGMENTATION_FLAG_ABS_OR_DELTA_UPDATE = 1 << 4,
>> +};
>> +
>> +#define V4L2_VP9_SEGMENT_FEATURE_ENABLED(id)	(1 << (id))
>> +#define V4L2_VP9_SEGMENT_FEATURE_ENABLED_MASK	0xf
>> +
>> +/**
>> + * enum v4l2_vp9_segment_feature - VP9 segment feature IDs
>> + *
>> + * @V4L2_VP9_SEGMENT_FEATURE_QP_DELTA: QP delta segment feature
>> + * @V4L2_VP9_SEGMENT_FEATURE_LF: loop filter segment feature
>> + * @V4L2_VP9_SEGMENT_FEATURE_REF_FRAME: reference frame segment feature
>> + * @V4L2_VP9_SEGMENT_FEATURE_SKIP: skip segment feature
>> + * @V4L2_VP9_SEGMENT_FEATURE_CNT: number of segment features
>> + *
>> + * Segment feature IDs. See section '7.2.10 Segmentation params syntax' of the
>> + * VP9 specification for more details.
>> + */
>> +enum v4l2_vp9_segment_feature {
>> +	V4L2_VP9_SEGMENT_FEATURE_QP_DELTA,
>> +	V4L2_VP9_SEGMENT_FEATURE_LF,
>> +	V4L2_VP9_SEGMENT_FEATURE_REF_FRAME,
>> +	V4L2_VP9_SEGMENT_FEATURE_SKIP,
>> +	V4L2_VP9_SEGMENT_FEATURE_CNT,
>> +};
>> +
>> +/**
>> + * struct v4l2_vp9_segmentation - VP9 segmentation parameters
>> + *
>> + * @flags: combination of V4L2_VP9_SEGMENTATION_FLAG_* flags
>> + * @tree_probs: specifies the probability values to be used when
>> + *              decoding a Segment-ID. See '5.15. Segmentation map'
>> + *              section of the VP9 specification for more details.
>> + * @pred_prob: specifies the probability values to be used when decoding a
>> + *	       Predicted-Segment-ID. See '6.4.14. Get segment id syntax'
>> + *	       section of :ref:`vp9` for more details..
>> + * @padding: padding used to make things aligned on 64 bits. Shall be zero
>> + *	     filled
>> + * @feature_enabled: bitmask defining which features are enabled in each
>> + *		     segment
>> + * @feature_data: data attached to each feature. Data entry is only valid if
>> + *		  the feature is enabled
>> + *
>> + * Encodes the quantization parameters. See section '7.2.10 Segmentation
>> + * params syntax' of the VP9 specification for more details.
>> + */
>> +struct v4l2_vp9_segmentation {
>> +	__u8 flags;
>> +	__u8 tree_probs[7];
>> +	__u8 pred_probs[3];
>> +	__u8 padding[5];
>> +	__u8 feature_enabled[8];
>> +	__s16 feature_data[8][4];
>> +};
>> +
>> +/**
>> + * enum v4l2_vp9_intra_prediction_mode - VP9 Intra prediction modes
>> + *
>> + * @V4L2_VP9_INTRA_PRED_DC: DC intra prediction
>> + * @V4L2_VP9_INTRA_PRED_MODE_V: vertical intra prediction
>> + * @V4L2_VP9_INTRA_PRED_MODE_H: horizontal intra prediction
>> + * @V4L2_VP9_INTRA_PRED_MODE_D45: D45 intra prediction
>> + * @V4L2_VP9_INTRA_PRED_MODE_D135: D135 intra prediction
>> + * @V4L2_VP9_INTRA_PRED_MODE_D117: D117 intra prediction
>> + * @V4L2_VP9_INTRA_PRED_MODE_D153: D153 intra prediction
>> + * @V4L2_VP9_INTRA_PRED_MODE_D207: D207 intra prediction
>> + * @V4L2_VP9_INTRA_PRED_MODE_D63: D63 intra prediction
>> + * @V4L2_VP9_INTRA_PRED_MODE_TM: True Motion intra prediction
>> + *
>> + * See section '7.4.5 Intra frame mode info semantics' for more details.
>> + */
>> +enum v4l2_vp9_intra_prediction_mode {
>> +	V4L2_VP9_INTRA_PRED_MODE_DC,
>> +	V4L2_VP9_INTRA_PRED_MODE_V,
>> +	V4L2_VP9_INTRA_PRED_MODE_H,
>> +	V4L2_VP9_INTRA_PRED_MODE_D45,
>> +	V4L2_VP9_INTRA_PRED_MODE_D135,
>> +	V4L2_VP9_INTRA_PRED_MODE_D117,
>> +	V4L2_VP9_INTRA_PRED_MODE_D153,
>> +	V4L2_VP9_INTRA_PRED_MODE_D207,
>> +	V4L2_VP9_INTRA_PRED_MODE_D63,
>> +	V4L2_VP9_INTRA_PRED_MODE_TM,
>> +};
>> +
>> +/**
>> + * enum v4l2_vp9_reset_frame_context - Valid values for
>> + *			&v4l2_ctrl_vp9_frame_decode_params->reset_frame_context
>> + *
>> + * @V4L2_VP9_RESET_FRAME_CTX_NONE: don't reset any frame context
>> + * @V4L2_VP9_RESET_FRAME_CTX_SPEC: reset the frame context pointed by
>> + *			&v4l2_ctrl_vp9_frame_decode_params.frame_context_idx
>> + * @V4L2_VP9_RESET_FRAME_CTX_ALL: reset all frame contexts
>> + *
>> + * See section '7.2 Uncompressed header semantics' of the VP9 specification
>> + * for more details.
>> + */
>> +enum v4l2_vp9_reset_frame_context {
>> +	V4L2_VP9_RESET_FRAME_CTX_NONE,
>> +	V4L2_VP9_RESET_FRAME_CTX_SPEC,
>> +	V4L2_VP9_RESET_FRAME_CTX_ALL,
>> +};
>> +
>> +/**
>> + * enum v4l2_vp9_interpolation_filter - VP9 interpolation filter types
>> + *
>> + * @V4L2_VP9_INTERP_FILTER_8TAP: height tap filter
>> + * @V4L2_VP9_INTERP_FILTER_8TAP_SMOOTH: height tap smooth filter
>> + * @V4L2_VP9_INTERP_FILTER_8TAP_SHARP: height tap sharp filter
>> + * @V4L2_VP9_INTERP_FILTER_BILINEAR: bilinear filter
>> + * @V4L2_VP9_INTERP_FILTER_SWITCHABLE: filter selection is signaled at the
>> + *				       block level
>> + *
>> + * See section '7.2.7 Interpolation filter semantics' of the VP9 specification
>> + * for more details.
>> + */
>> +enum v4l2_vp9_interpolation_filter {
>> +	V4L2_VP9_INTERP_FILTER_8TAP,
>> +	V4L2_VP9_INTERP_FILTER_8TAP_SMOOTH,
>> +	V4L2_VP9_INTERP_FILTER_8TAP_SHARP,
>> +	V4L2_VP9_INTERP_FILTER_BILINEAR,
>> +	V4L2_VP9_INTERP_FILTER_SWITCHABLE,
>> +};
>> +
>> +/**
>> + * enum v4l2_vp9_reference_mode - VP9 reference modes
>> + *
>> + * @V4L2_VP9_REF_MODE_SINGLE: indicates that all the inter blocks use only a
>> + *			      single reference frame to generate motion
>> + *			      compensated prediction
>> + * @V4L2_VP9_REF_MODE_COMPOUND: requires all the inter blocks to use compound
>> + *				mode. Single reference frame prediction is not
>> + *				allowed
>> + * @V4L2_VP9_REF_MODE_SELECT: allows each individual inter block to select
>> + *			      between single and compound prediction modes
>> + *
>> + * See section '7.3.6 Frame reference mode semantics' of the VP9 specification
>> + * for more details.
>> + */
>> +enum v4l2_vp9_reference_mode {
>> +	V4L2_VP9_REF_MODE_SINGLE,
>> +	V4L2_VP9_REF_MODE_COMPOUND,
>> +	V4L2_VP9_REF_MODE_SELECT,
>> +};
>> +
>> +/**
>> + * enum v4l2_vp9_tx_mode - VP9 TX modes
>> + *
>> + * @V4L2_VP9_TX_MODE_ONLY_4X4: transform size is 4x4
>> + * @V4L2_VP9_TX_MODE_ALLOW_8X8: transform size can be up to 8x8
>> + * @V4L2_VP9_TX_MODE_ALLOW_16X16: transform size can be up to 16x16
>> + * @V4L2_VP9_TX_MODE_ALLOW_32X32: transform size can be up to 32x32
>> + * @V4L2_VP9_TX_MODE_SELECT: bitstream contains transform size for each block
>> + *
>> + * See section '7.3.1 Tx mode semantics' of the VP9 specification for more
>> + * details.
>> + */
>> +enum v4l2_vp9_tx_mode {
>> +	V4L2_VP9_TX_MODE_ONLY_4X4,
>> +	V4L2_VP9_TX_MODE_ALLOW_8X8,
>> +	V4L2_VP9_TX_MODE_ALLOW_16X16,
>> +	V4L2_VP9_TX_MODE_ALLOW_32X32,
>> +	V4L2_VP9_TX_MODE_SELECT,
>> +};
>> +
>> +/**
>> + * enum v4l2_vp9_ref_id - VP9 Reference frame IDs
>> + *
>> + * @V4L2_REF_ID_LAST: last reference frame
>> + * @V4L2_REF_ID_GOLDEN: golden reference frame
>> + * @V4L2_REF_ID_ALTREF: alternative reference frame
>> + * @V4L2_REF_ID_CNT: number of reference frames
>> + *
>> + * See section '7.4.12 Ref frames semantics' of the VP9 specification for more
>> + * details.
>> + */
>> +enum v4l2_vp9_ref_id {
>> +	V4L2_REF_ID_LAST,
>> +	V4L2_REF_ID_GOLDEN,
>> +	V4L2_REF_ID_ALTREF,
>> +	V4L2_REF_ID_CNT,
>> +};
>> +
>> +/**
>> + * enum v4l2_vp9_frame_flags - VP9 frame flags
>> + * @V4L2_VP9_FRAME_FLAG_KEY_FRAME: the frame is a key frame
>> + * @V4L2_VP9_FRAME_FLAG_SHOW_FRAME: the frame should be displayed
>> + * @V4L2_VP9_FRAME_FLAG_ERROR_RESILIENT: the decoding should be error resilient
>> + * @V4L2_VP9_FRAME_FLAG_INTRA_ONLY: the frame does not reference other frames
>> + * @V4L2_VP9_FRAME_FLAG_ALLOW_HIGH_PREC_MV: the frame might can high precision
>> + *					    motion vectors
>> + * @V4L2_VP9_FRAME_FLAG_REFRESH_FRAME_CTX: frame context should be updated
>> + *					   after decoding
>> + * @V4L2_VP9_FRAME_FLAG_PARALLEL_DEC_MODE: parallel decoding is used
>> + * @V4L2_VP9_FRAME_FLAG_X_SUBSAMPLING: vertical subsampling is enabled
>> + * @V4L2_VP9_FRAME_FLAG_Y_SUBSAMPLING: horizontal subsampling is enabled
>> + * @V4L2_VP9_FRAME_FLAG_COLOR_RANGE_FULL_SWING: full UV range is used
>> + *
>> + * Check the VP9 specification for more details.
>> + */
>> +enum v4l2_vp9_frame_flags {
>> +	V4L2_VP9_FRAME_FLAG_KEY_FRAME = 1 << 0,
>> +	V4L2_VP9_FRAME_FLAG_SHOW_FRAME = 1 << 1,
>> +	V4L2_VP9_FRAME_FLAG_ERROR_RESILIENT = 1 << 2,
>> +	V4L2_VP9_FRAME_FLAG_INTRA_ONLY = 1 << 3,
>> +	V4L2_VP9_FRAME_FLAG_ALLOW_HIGH_PREC_MV = 1 << 4,
>> +	V4L2_VP9_FRAME_FLAG_REFRESH_FRAME_CTX = 1 << 5,
>> +	V4L2_VP9_FRAME_FLAG_PARALLEL_DEC_MODE = 1 << 6,
>> +	V4L2_VP9_FRAME_FLAG_X_SUBSAMPLING = 1 << 7,
>> +	V4L2_VP9_FRAME_FLAG_Y_SUBSAMPLING = 1 << 8,
>> +	V4L2_VP9_FRAME_FLAG_COLOR_RANGE_FULL_SWING = 1 << 9,
>> +};
>> +
>> +#define V4L2_VP9_PROFILE_MAX		3
>> +
>> +#define V4L2_CID_STATELESS_VP9_FRAME_DECODE_PARAMS	(V4L2_CID_CODEC_STATELESS_BASE + 300)
>> +/**
>> + * struct v4l2_ctrl_vp9_frame_decode_params - VP9 frame decoding control
>> + *
>> + * @flags: combination of V4L2_VP9_FRAME_FLAG_* flags
>> + * @compressed_header_size: compressed header size in bytes
>> + * @uncompressed_header_size: uncompressed header size in bytes
>> + * @profile: VP9 profile. Can be 0, 1, 2 or 3
>> + * @reset_frame_context: specifies whether the frame context should be reset
>> + *			 to default values. See &v4l2_vp9_reset_frame_context
>> + *			 for more details
>> + * @frame_context_idx: frame context that should be used/updated
>> + * @bit_depth: bits per components. Can be 8, 10 or 12. Note that not all
>> + *	       profiles support 10 and/or 12 bits depths
>> + * @interpolation_filter: specifies the filter selection used for performing
>> + *			  inter prediction. See &v4l2_vp9_interpolation_filter
>> + *			  for more details
>> + * @tile_cols_log2: specifies the base 2 logarithm of the width of each tile
>> + *		    (where the width is measured in units of 8x8 blocks).
>> + *		    Shall be less than or equal to 6
>> + * @tile_rows_log2: specifies the base 2 logarithm of the height of each tile
>> + *		    (where the height is measured in units of 8x8 blocks)
>> + * @tx_mode: specifies the TX mode. See &v4l2_vp9_tx_mode for more details
>> + * @reference_mode: specifies the type of inter prediction to be used. See
>> + *		    &v4l2_vp9_reference_mode for more details
>> + * @padding: needed to make this struct 64 bit aligned. Shall be filled with
>> + *	     zeros
>> + * @frame_width_minus_1: add 1 to it and you'll get the frame width expressed
>> + *			 in pixels
>> + * @frame_height_minus_1: add 1 to it and you'll get the frame height expressed
>> + *			  in pixels
>> + * @render_width_minus_1: add 1 to it and you'll get the expected render width
>> + *			 expressed in pixels. This is not used during the
>> + *			 decoding process but might be used by HW scalers to
>> + *			 prepare a frame that's ready for scanout
>> + * @render_height_minus_1: add 1 to it and you'll get the expected render height
>> + *			 expressed in pixels. This is not used during the
>> + *			 decoding process but might be used by HW scalers to
>> + *			 prepare a frame that's ready for scanout
>> + * @refs: array of ref frames timestamps. See &v4l2_vp9_ref_id for more details
>> + * @ref_frame_sign_bias: array of reference frames motion vector sign bias
>> + *			(prediction direction)
>> + * @lf: loop filter parameters. See &v4l2_vp9_loop_filter for more details
>> + * @quant: quantization parameters. See &v4l2_vp9_quantization for more details
>> + * @seg: segmentation parameters. See &v4l2_vp9_segmentation for more details
>> + */
>> +struct v4l2_ctrl_vp9_frame_decode_params {
>> +	__u32 flags;
>> +	__u16 compressed_header_size;
>> +	__u16 uncompressed_header_size;
>> +	__u8 profile;
>> +	__u8 reset_frame_context;
>> +	__u8 frame_context_idx;
>> +	__u8 bit_depth;
>> +	__u8 interpolation_filter;
>> +	__u8 tile_cols_log2;
>> +	__u8 tile_rows_log2;
>> +	__u8 tx_mode;
>> +	__u8 reference_mode;
>> +	__u8 padding[7];
>> +	__u16 frame_width_minus_1;
>> +	__u16 frame_height_minus_1;
>> +	__u16 render_width_minus_1;
>> +	__u16 render_height_minus_1;
>> +	__u64 refs[V4L2_REF_ID_CNT];
>> +	__u8 ref_frame_sign_bias[V4L2_REF_ID_CNT + 1];
>> +	struct v4l2_vp9_loop_filter lf;
>> +	struct v4l2_vp9_quantization quant;
>> +	struct v4l2_vp9_segmentation seg;
>> +};
>> +
>> +#define V4L2_VP9_NUM_FRAME_CTX	4
>> +
>> +/**
>> + * struct v4l2_vp9_mv_compressed_hdr_probs - VP9 Motion vector probability updates
>> + * @joint: motion vector joint probability updates
>> + * @sign: motion vector sign probability updates
>> + * @class: motion vector class probability updates
>> + * @class0_bit: motion vector class0 bit probability updates
>> + * @bits: motion vector bits probability updates
>> + * @class0_fr: motion vector class0 fractional bit probability updates
>> + * @fr: motion vector fractional bit probability updates
>> + * @class0_hp: motion vector class0 high precision fractional bit probability updates
>> + * @hp: motion vector high precision fractional bit probability updates
>> + *
>> + * This structure contains new values of motion vector probabilities.
>> + * A value of zero means there is no update.
> 
> 'A value of zero': do you mean that the whole struct is zeroed, or just specific
> arrays or single bytes? It's not clear to me at what level this is done.

It can be zeroed on an element-by-element basis.

> 
>> + * See `struct v4l2_vp9_prob_updates` for details.
>> + */
>> +struct v4l2_vp9_mv_compressed_hdr_probs {
>> +	__u8 joint[3];
>> +	__u8 sign[2];
>> +	__u8 class[2][10];
>> +	__u8 class0_bit[2];
>> +	__u8 bits[2][10];
>> +	__u8 class0_fr[2][2][3];
>> +	__u8 fr[2][3];
>> +	__u8 class0_hp[2];
>> +	__u8 hp[2];
>> +};
>> +
>> +#define V4L2_CID_STATELESS_VP9_COMPRESSED_HDR_PROBS	(V4L2_CID_CODEC_STATELESS_BASE + 301)
>> +/**
>> + * struct v4l2_ctrl_vp9_compressed_hdr_probs - VP9 probability updates control
>> + * @tx8: TX 8x8 probability updates
>> + * @tx16: TX 16x16 probability updates
>> + * @tx32: TX 32x32 probability updates
>> + * @coef: coefficient probability updates
>> + * @skip: skip probability updates
>> + * @inter_mode: inter mode probability updates
>> + * @interp_filter: interpolation filter probability updates
>> + * @is_inter: is inter-block probability updates
>> + * @comp_mode: compound prediction mode probability updates
>> + * @single_ref: single ref probability updates
>> + * @comp_ref: compound ref probability updates
>> + * @y_mode: Y prediction mode probability updates
>> + * @uv_mode: UV prediction mode probability updates
>> + * @partition: partition probability updates
>> + * @mv: motion vector probability updates
>> + *
>> + * This structure holds the probabilities update as parsed in the compressed
>> + * header (Spec 6.3). These values represent the value of probability update after
>> + * being translated with inv_map_table[] (see 6.3.5). A value of zero means that
>> + * there is no update.
> 
> Same question.

Same answer :D

> 
>> + */
>> +struct v4l2_ctrl_vp9_compressed_hdr_probs {
>> +	__u8 tx8[2][1];
>> +	__u8 tx16[2][2];
>> +	__u8 tx32[2][3];
>> +	__u8 coef[4][2][2][6][6][3];
>> +	__u8 skip[3];
>> +	__u8 inter_mode[7][3];
>> +	__u8 interp_filter[4][2];
>> +	__u8 is_inter[4];
>> +	__u8 comp_mode[5];
>> +	__u8 single_ref[5][2];
>> +	__u8 comp_ref[5];
>> +	__u8 y_mode[4][9];
>> +	__u8 uv_mode[10][9];
>> +	__u8 partition[16][3];
>> +
>> +	struct v4l2_vp9_mv_compressed_hdr_probs mv;
>> +};
>> +
>>   /* MPEG-compression definitions kept for backwards compatibility */
>>   #ifndef __KERNEL__
>>   #define V4L2_CTRL_CLASS_MPEG            V4L2_CTRL_CLASS_CODEC
>> diff --git a/include/uapi/linux/videodev2.h b/include/uapi/linux/videodev2.h
>> index 311a01cc5775..508e2d6825b1 100644
>> --- a/include/uapi/linux/videodev2.h
>> +++ b/include/uapi/linux/videodev2.h
>> @@ -697,6 +697,7 @@ struct v4l2_pix_format {
>>   #define V4L2_PIX_FMT_VP8      v4l2_fourcc('V', 'P', '8', '0') /* VP8 */
>>   #define V4L2_PIX_FMT_VP8_FRAME v4l2_fourcc('V', 'P', '8', 'F') /* VP8 parsed frame */
>>   #define V4L2_PIX_FMT_VP9      v4l2_fourcc('V', 'P', '9', '0') /* VP9 */
>> +#define V4L2_PIX_FMT_VP9_FRAME v4l2_fourcc('V', 'P', '9', 'F') /* VP9 parsed frame */
>>   #define V4L2_PIX_FMT_HEVC     v4l2_fourcc('H', 'E', 'V', 'C') /* HEVC aka H.265 */
>>   #define V4L2_PIX_FMT_FWHT     v4l2_fourcc('F', 'W', 'H', 'T') /* Fast Walsh Hadamard Transform (vicodec) */
>>   #define V4L2_PIX_FMT_FWHT_STATELESS     v4l2_fourcc('S', 'F', 'W', 'H') /* Stateless FWHT (vicodec) */
>> @@ -1747,6 +1748,8 @@ struct v4l2_ext_control {
>>   		struct v4l2_ctrl_h264_decode_params __user *p_h264_decode_params;
>>   		struct v4l2_ctrl_fwht_params __user *p_fwht_params;
>>   		struct v4l2_ctrl_vp8_frame __user *p_vp8_frame;
>> +		struct v4l2_ctrl_vp9_compressed_hdr_probs __user *p_vp9_compressed_hdr_probs;
>> +		struct v4l2_ctrl_vp9_frame_decode_params __user *p_vp9_frame_decode_params;
>>   		void __user *ptr;
>>   	};
>>   } __attribute__ ((packed));
>> @@ -1807,6 +1810,9 @@ enum v4l2_ctrl_type {
>>   	V4L2_CTRL_TYPE_FWHT_PARAMS	    = 0x0220,
>>   
>>   	V4L2_CTRL_TYPE_VP8_FRAME            = 0x0240,
>> +
>> +	V4L2_CTRL_TYPE_VP9_COMPRESSED_HDR_PROBS	= 0x0260,
>> +	V4L2_CTRL_TYPE_VP9_FRAME_DECODE_PARAMS	= 0x0261,
>>   };
>>   
>>   /*  Used in the VIDIOC_QUERYCTRL ioctl for querying controls */
>>
> 
> Regards,
> 
> 	Hans
>
Nicolas Dufresne May 5, 2021, 5:36 p.m. UTC | #3
Hi Hans,

just a partial reply, I'll let Andrzej extend.

Le jeudi 29 avril 2021 à 12:20 +0200, Hans Verkuil a écrit :
> > +      - ``frame_width_minus_1``
> > +      - Add 1 to get the frame width expressed in pixels.
> > +    * - __u16
> > +      - ``frame_height_minus_1``
> > +      - Add 1 to get the frame height expressed in pixels.
> 
> These two fields are weird. Isn't this defined by setting the output format?
> And why the 'minus_1'?
> 
> > +    * - __u16
> > +      - ``render_width_minus_1``
> > +      - Add 1 to get the expected render width expressed in pixels. This is
> > +        not used during the decoding process but might be used by HW
> > scalers to
> > +        prepare a frame that's ready for scanout.
> > +    * - __u16
> > +      - render_height_minus_1
> > +      - Add 1 to get the expected render height expressed in pixels. This
> > is
> > +        not used during the decoding process but might be used by HW
> > scalers to
> > +        prepare a frame that's ready for scanout.
> 
> No idea what these fields are about. I suspect this can be defined by setting
> the capture format, but I'm not sure.

We have the same for other codecs. Each codec bitstream include the coded and
the display size in some form. For H264/H265 that was passed as as number of
macroblock and a crop rectangle. For VP9 value - 1 is as defined in the spec. As
0 is not valid, the boolean coder can save some bits when storing the value.
Though, for parameters, we usually start with the way it's encoded first, and
change it only if we think it make sense. We'll take note and consider this
whenever we have a second driver to look at.

Now, why do we include both here. Well in fact, the HW may have some extra
constraints. Which means there will be up to 3 frame sizes that matters. We
can't also determine if the display/render or coded size will be used for minim
CAPTURE format, as this will in fact depends if a post processor will be used or
not. 

So to recap, we limit the CAPTURE format base on this information, and not the
opposite. The width/height on OUTPUT FMT has been define as meaningless in the
spec (to align with stateful I suppose ?). This way, the driver got all the
information aligned with how it works inside the codec, without having to do a
translation dance, and then properly implement CAPTURE TRY_FMT base on that.

To make an analogy with stateful codec, this replaces the queuing of a frame
that contains codec headers. We skip the SRC_CH events, since this is no longer
asynchronous.

Nicolas
diff mbox series

Patch

diff --git a/Documentation/userspace-api/media/v4l/biblio.rst b/Documentation/userspace-api/media/v4l/biblio.rst
index 64d241daf63c..051982896375 100644
--- a/Documentation/userspace-api/media/v4l/biblio.rst
+++ b/Documentation/userspace-api/media/v4l/biblio.rst
@@ -417,3 +417,13 @@  VP8
 :title:     RFC 6386: "VP8 Data Format and Decoding Guide"
 
 :author:    J. Bankoski et al.
+
+.. _vp9:
+
+VP9
+===
+
+
+:title:     VP9 Bitstream & Decoding Process Specification
+
+:author:    Adrian Grange (Google), Peter de Rivaz (Argon Design), Jonathan Hunt (Argon Design)
diff --git a/Documentation/userspace-api/media/v4l/ext-ctrls-codec-stateless.rst b/Documentation/userspace-api/media/v4l/ext-ctrls-codec-stateless.rst
index 3fc04daa9ffb..ab40c878c8ad 100644
--- a/Documentation/userspace-api/media/v4l/ext-ctrls-codec-stateless.rst
+++ b/Documentation/userspace-api/media/v4l/ext-ctrls-codec-stateless.rst
@@ -1244,3 +1244,526 @@  FWHT Flags
     * - __u8
       - ``padding[3]``
       - Applications and drivers must set this to zero.
+
+.. _v4l2-codec-stateless-vp9:
+
+``V4L2_CID_STATELESS_VP9_COMPRESSED_HDR_PROBS (struct)``
+    Stores VP9 probabilities updates as parsed from the current compressed frame
+    header. A value of zero in a struct member means no update of the relevant
+    probability. Motion vector-related updates contain a new value or zero. All
+    other updates contain values translated with inv_map_table[] (see 6.3.5 in
+    :ref:`vp9`).
+
+.. c:type:: v4l2_ctrl_vp9_compressed_hdr_probs
+
+.. cssclass:: longtable
+
+.. tabularcolumns:: |p{5.8cm}|p{4.8cm}|p{6.6cm}|
+
+.. flat-table:: struct v4l2_ctrl_vp9_compressed_hdr_probs
+    :header-rows:  0
+    :stub-columns: 0
+    :widths:       1 1 2
+
+    * - __u8
+      - ``tx8[2][1]``
+      - TX 8x8 probabilities delta.
+    * - __u8
+      - ``tx16[2][2]``
+      - TX 16x16 probabilities delta.
+    * - __u8
+      - ``tx32[2][3]``
+      - TX 32x32 probabilities delta.
+    * - __u8
+      - ``coef[4][2][2][6][6][3]``
+      - Coefficient probabilities delta.
+    * - __u8
+      - ``skip[3]``
+      - Skip probabilities delta.
+    * - __u8
+      - ``inter_mode[7][3]``
+      - Inter prediction mode probabilities delta.
+    * - __u8
+      - ``interp_filter[4][2]``
+      - Interpolation filter probabilities delta.
+    * - __u8
+      - ``is_inter[4]``
+      - Is inter-block probabilities delta.
+    * - __u8
+      - ``comp_mode[5]``
+      - Compound prediction mode probabilities delta.
+    * - __u8
+      - ``single_ref[5][2]``
+      - Single reference probabilities delta.
+    * - __u8
+      - ``comp_mode[5]``
+      - Compound reference probabilities delta.
+    * - __u8
+      - ``y_mode[4][9]``
+      - Y prediction mode probabilities delta.
+    * - __u8
+      - ``uv_mode[10][9]``
+      - UV prediction mode probabilities delta.
+    * - __u8
+      - ``partition[16][3]``
+      - Partition probabilities delta.
+    * - __u8
+      - ``partition[16][3]``
+      - Partition probabilities delta.
+    * - __u8
+      - ``mv.joint[3]``
+      - Motion vector joint probabilities delta.
+    * - __u8
+      - ``mv.sign[2]``
+      - Motion vector sign probabilities delta.
+    * - __u8
+      - ``mv.class[2][10]``
+      - Motion vector class probabilities delta.
+    * - __u8
+      - ``mv.class0_bit[2]``
+      - Motion vector class0 bit probabilities delta.
+    * - __u8
+      - ``mv.bits[2][10]``
+      - Motion vector bits probabilities delta.
+    * - __u8
+      - ``mv.class0_fr[2][2][3]``
+      - Motion vector class0 fractional bit probabilities delta.
+    * - __u8
+      - ``mv.fr[2][3]``
+      - Motion vector fractional bit probabilities delta.
+    * - __u8
+      - ``mv.class0_hp[2]``
+      - Motion vector class0 high precision fractional bit probabilities delta.
+    * - __u8
+      - ``mv.hp[2]``
+      - Motion vector high precision fractional bit probabilities delta.
+
+``V4L2_CID_STATELESS_VP9_FRAME_DECODE_PARAMS (struct)``
+    Specifies the frame parameters for the associated VP9 frame decode request.
+    This includes the necessary parameters for configuring a stateless hardware
+    decoding pipeline for VP9. The bitstream parameters are defined according
+    to :ref:`vp9`.
+
+    .. note::
+
+       This compound control is not yet part of the public kernel API and
+       it is expected to change.
+
+.. c:type:: v4l2_ctrl_vp9_frame_decode_params
+
+.. cssclass:: longtable
+
+.. tabularcolumns:: |p{1.5cm}|p{6.3cm}|p{9.4cm}|
+
+.. flat-table:: struct v4l2_ctrl_vp9_frame_decode_params
+    :header-rows:  0
+    :stub-columns: 0
+    :widths:       1 1 2
+
+    * - __u32
+      - ``flags``
+      - Combination of V4L2_VP9_FRAME_FLAG_* flags. See
+        :c:type:`v4l2_vp9_frame_flags`.
+    * - __u16
+      - ``compressed_header_size``
+      - Compressed header size in bytes.
+    * - __u16
+      - ``uncompressed_header_size``
+      - Uncompressed header size in bytes.
+    * - __u8
+      - ``profile``
+      - VP9 profile. Can be 0, 1, 2 or 3.
+    * - __u8
+      - ``reset_frame_context``
+      - Frame context that should be used/updated when decoding the frame.
+    * - __u8
+      - ``bit_depth``
+      - Component depth in bits. Must be 8 for profile 0 and 1. Must 10 or 12
+        for profile 2 and 3.
+    * - __u8
+      - ``interpolation_filter``
+      - Specifies the filter selection used for performing inter prediction. See
+        :c:type:`v4l2_vp9_interpolation_filter`.
+    * - __u8
+      - ``tile_cols_log2``
+      - Specifies the base 2 logarithm of the width of each tile (where the
+        width is measured in units of 8x8 blocks). Shall be less than or equal
+        to 6.
+    * - __u8
+      - ``tile_rows_log2``
+      - Specifies the base 2 logarithm of the height of each tile (where the
+        height is measured in units of 8x8 blocks)
+    * - __u8
+      - ``tx_mode``
+      - Specifies the TX mode. See :c:type:`v4l2_vp9_tx_mode`.
+    * - __u8
+      - ``reference_mode``
+      - Specifies the type of inter prediction to be used. See
+        :c:type:`v4l2_vp9_reference_mode`.
+    * - __u8
+      - ``padding[7]``
+      - Needed to make this struct 64 bit aligned. Shall be filled with zeroes.
+    * - __u16
+      - ``frame_width_minus_1``
+      - Add 1 to get the frame width expressed in pixels.
+    * - __u16
+      - ``frame_height_minus_1``
+      - Add 1 to get the frame height expressed in pixels.
+    * - __u16
+      - ``render_width_minus_1``
+      - Add 1 to get the expected render width expressed in pixels. This is
+        not used during the decoding process but might be used by HW scalers to
+        prepare a frame that's ready for scanout.
+    * - __u16
+      - render_height_minus_1
+      - Add 1 to get the expected render height expressed in pixels. This is
+        not used during the decoding process but might be used by HW scalers to
+        prepare a frame that's ready for scanout.
+    * - __u64
+      - ``refs[3]``
+      - Array of reference frame timestamps.
+    * - __u8
+      - ``ref_frame_sign_bias[4]``
+      - Array of reference frames motion vector sign bias (prediction direction)
+    * - struct :c:type:`v4l2_vp9_loop_filter`
+      - ``lf``
+      - Loop filter parameters. See struct :c:type:`v4l2_vp9_loop_filter`.
+    * - struct :c:type:`v4l2_vp9_quantization`
+      - ``quant``
+      - Quantization parameters. See :c:type:`v4l2_vp9_quantization`.
+    * - struct :c:type:`v4l2_vp9_segmentation`
+      - ``seg``
+      - Segmentation parameters. See :c:type:`v4l2_vp9_segmentation`.
+    * - struct :c:type:`v4l2_vp9_probabilities`
+      - ``probs``
+      - Probabilities. See :c:type:`v4l2_vp9_probabilities`.
+
+.. c:type:: v4l2_vp9_frame_flags
+
+.. cssclass:: longtable
+
+.. tabularcolumns:: |p{1.5cm}|p{6.3cm}|p{9.4cm}|
+
+.. flat-table:: enum v4l2_vp9_frame_flags
+    :header-rows:  0
+    :stub-columns: 0
+    :widths:       1 2
+
+    * - ``V4L2_VP9_FRAME_FLAG_KEY_FRAME``
+      - The frame is a key frame.
+    * - ``V4L2_VP9_FRAME_FLAG_SHOW_FRAME``
+      - The frame should be displayed.
+    * - ``V4L2_VP9_FRAME_FLAG_ERROR_RESILIENT``
+      - The decoding should be error resilient.
+    * - ``V4L2_VP9_FRAME_FLAG_INTRA_ONLY``
+      - The frame does not reference other frames.
+    * - ``V4L2_VP9_FRAME_FLAG_ALLOW_HIGH_PREC_MV``
+      - the frame might can high precision motion vectors.
+    * - ``V4L2_VP9_FRAME_FLAG_REFRESH_FRAME_CTX``
+      - Frame context should be updated after decoding.
+    * - ``V4L2_VP9_FRAME_FLAG_PARALLEL_DEC_MODE``
+      - Parallel decoding is used.
+    * - ``V4L2_VP9_FRAME_FLAG_X_SUBSAMPLING``
+      - Vertical subsampling is enabled.
+    * - ``V4L2_VP9_FRAME_FLAG_Y_SUBSAMPLING``
+      - Horizontal subsampling is enabled.
+    * - ``V4L2_VP9_FRAME_FLAG_COLOR_RANGE_FULL_SWING``
+      - The full UV range is used.
+
+.. c:type:: v4l2_vp9_ref_id
+
+.. cssclass:: longtable
+
+.. tabularcolumns:: |p{1.5cm}|p{6.3cm}|p{9.4cm}|
+
+.. flat-table:: enum v4l2_vp9_ref_id
+    :header-rows:  0
+    :stub-columns: 0
+    :widths:       1 2
+
+    * - ``V4L2_REF_ID_LAST``
+      - Last reference frame.
+    * - ``V4L2_REF_ID_GOLDEN``
+      - Golden reference frame.
+    * - ``V4L2_REF_ID_ALTREF``
+      - Alternative reference frame.
+    * - ``V4L2_REF_ID_CNT``
+      - Number of reference frames.
+
+.. c:type:: v4l2_vp9_tx_mode
+
+.. cssclass:: longtable
+
+.. tabularcolumns:: |p{1.5cm}|p{6.3cm}|p{9.4cm}|
+
+.. flat-table:: enum v4l2_vp9_tx_mode
+    :header-rows:  0
+    :stub-columns: 0
+    :widths:       1 2
+
+    * - ``V4L2_VP9_TX_MODE_ONLY_4X4``
+      - Transform size is 4x4.
+    * - ``V4L2_VP9_TX_MODE_ALLOW_8X8``
+      - Transform size can be up to 8x8.
+    * - ``V4L2_VP9_TX_MODE_ALLOW_16X16``
+      - Transform size can be up to 16x16.
+    * - ``V4L2_VP9_TX_MODE_ALLOW_32X32``
+      - transform size can be up to 32x32.
+    * - ``V4L2_VP9_TX_MODE_SELECT``
+      - Bitstream contains transform size for each block.
+
+.. c:type:: v4l2_vp9_reference_mode
+
+.. cssclass:: longtable
+
+.. tabularcolumns:: |p{1.5cm}|p{6.3cm}|p{9.4cm}|
+
+.. flat-table:: enum v4l2_vp9_reference_mode
+    :header-rows:  0
+    :stub-columns: 0
+    :widths:       1 2
+
+    * - ``V4L2_VP9_REF_MODE_SINGLE``
+      - Indicates that all the inter blocks use only a single reference frame
+        to generate motion compensated prediction.
+    * - ``V4L2_VP9_REF_MODE_COMPOUND``
+      - Requires all the inter blocks to use compound mode. Single reference
+        frame prediction is not allowed.
+    * - ``V4L2_VP9_REF_MODE_SELECT``
+      - Allows each individual inter block to select between single and
+        compound prediction modes.
+
+.. c:type:: v4l2_vp9_interpolation_filter
+
+.. cssclass:: longtable
+
+.. tabularcolumns:: |p{1.5cm}|p{6.3cm}|p{9.4cm}|
+
+.. flat-table:: enum v4l2_vp9_interpolation_filter
+    :header-rows:  0
+    :stub-columns: 0
+    :widths:       1 2
+
+    * - ``V4L2_VP9_INTERP_FILTER_8TAP``
+      - Height tap filter.
+    * - ``V4L2_VP9_INTERP_FILTER_8TAP_SMOOTH``
+      - Height tap smooth filter.
+    * - ``V4L2_VP9_INTERP_FILTER_8TAP_SHARP``
+      - Height tap sharp filter.
+    * - ``V4L2_VP9_INTERP_FILTER_BILINEAR``
+      - Bilinear filter.
+    * - ``V4L2_VP9_INTERP_FILTER_SWITCHABLE``
+      - Filter selection is signaled at the block level.
+
+.. c:type:: v4l2_vp9_reset_frame_context
+
+.. cssclass:: longtable
+
+.. tabularcolumns:: |p{1.5cm}|p{6.3cm}|p{9.4cm}|
+
+.. flat-table:: enum v4l2_vp9_reset_frame_context
+    :header-rows:  0
+    :stub-columns: 0
+    :widths:       1 2
+
+    * - ``V4L2_VP9_RESET_FRAME_CTX_NONE``
+      - Do not reset any frame context.
+    * - ``V4L2_VP9_RESET_FRAME_CTX_SPEC``
+      - Reset the frame context pointed by
+        :c:type:`v4l2_ctrl_vp9_frame_decode_params`.frame_context_idx.
+    * - ``V4L2_VP9_RESET_FRAME_CTX_ALL``
+      - Reset all frame contexts.
+
+.. c:type:: v4l2_vp9_intra_prediction_mode
+
+.. cssclass:: longtable
+
+.. tabularcolumns:: |p{1.5cm}|p{6.3cm}|p{9.4cm}|
+
+.. flat-table:: enum v4l2_vp9_intra_prediction_mode
+    :header-rows:  0
+    :stub-columns: 0
+    :widths:       1 2
+
+    * - ``V4L2_VP9_INTRA_PRED_DC``
+      - DC intra prediction.
+    * - ``V4L2_VP9_INTRA_PRED_MODE_V``
+      - Vertical intra prediction.
+    * - ``V4L2_VP9_INTRA_PRED_MODE_H``
+      - Horizontal intra prediction.
+    * - ``V4L2_VP9_INTRA_PRED_MODE_D45``
+      - D45 intra prediction.
+    * - ``V4L2_VP9_INTRA_PRED_MODE_D135``
+      - D135 intra prediction.
+    * - ``V4L2_VP9_INTRA_PRED_MODE_D117``
+      - D117 intra prediction.
+    * - ``V4L2_VP9_INTRA_PRED_MODE_D153``
+      - D153 intra prediction.
+    * - ``V4L2_VP9_INTRA_PRED_MODE_D207``
+      - D207 intra prediction.
+    * - ``V4L2_VP9_INTRA_PRED_MODE_D63``
+      - D63 intra prediction.
+    * - ``V4L2_VP9_INTRA_PRED_MODE_TM``
+      - True motion intra prediction.
+
+.. c:type:: v4l2_vp9_segmentation
+
+.. cssclass:: longtable
+
+.. tabularcolumns:: |p{1.5cm}|p{6.3cm}|p{9.4cm}|
+
+.. flat-table:: struct v4l2_vp9_segmentation
+    :header-rows:  0
+    :stub-columns: 0
+    :widths:       1 1 2
+
+    * - __u8
+      - ``flags``
+      - Combination of V4L2_VP9_SEGMENTATION_FLAG_* flags. See
+        :c:type:`v4l2_vp9_segmentation_flags`.
+    * - __u8
+      - ``tree_probs[7]``
+      - Specifies the probability values to be used when decoding a Segment-ID.
+        See '5.15. Segmentation map' section of :ref:`vp9` for more details.
+    * - __u8
+      - ``pred_prob[3]``
+      - Specifies the probability values to be used when decoding a
+        Predicted-Segment-ID. See '6.4.14. Get segment id syntax'
+        section of :ref:`vp9` for more details.
+    * - __u8
+      - ``padding[5]``
+      - Used to align this struct on 64 bit. Shall be filled with zeroes.
+    * - __u8
+      - ``feature_enabled[8]``
+      - Bitmask defining which features are enabled in each segment.
+    * - __u8
+      - ``feature_data[8][4]``
+      - Data attached to each feature. Data entry is only valid if the feature
+        is enabled.
+
+.. c:type:: v4l2_vp9_segment_feature
+
+.. cssclass:: longtable
+
+.. tabularcolumns:: |p{1.5cm}|p{6.3cm}|p{9.4cm}|
+
+.. flat-table:: enum v4l2_vp9_segment_feature
+    :header-rows:  0
+    :stub-columns: 0
+    :widths:       1 2
+
+    * - ``V4L2_VP9_SEGMENT_FEATURE_QP_DELTA``
+      - QP delta segment feature.
+    * - ``V4L2_VP9_SEGMENT_FEATURE_LF``
+      - Loop filter segment feature.
+    * - ``V4L2_VP9_SEGMENT_FEATURE_REF_FRAME``
+      - Reference frame segment feature.
+    * - ``V4L2_VP9_SEGMENT_FEATURE_SKIP``
+      - Skip segment feature.
+    * - ``V4L2_VP9_SEGMENT_FEATURE_CNT``
+      - Number of segment features.
+
+.. c:type:: v4l2_vp9_segmentation_flags
+
+.. cssclass:: longtable
+
+.. tabularcolumns:: |p{1.5cm}|p{6.3cm}|p{9.4cm}|
+
+.. flat-table:: enum v4l2_vp9_segmentation_flags
+    :header-rows:  0
+    :stub-columns: 0
+    :widths:       1 2
+
+    * - ``V4L2_VP9_SEGMENTATION_FLAG_ENABLED``
+      - Indicates that this frame makes use of the segmentation tool.
+    * - ``V4L2_VP9_SEGMENTATION_FLAG_UPDATE_MAP``
+      - Indicates that the segmentation map should be updated during the
+        decoding of this frame.
+    * - ``V4L2_VP9_SEGMENTATION_FLAG_TEMPORAL_UPDATE``
+      - Indicates that the updates to the segmentation map are coded
+        relative to the existing segmentation map.
+    * - ``V4L2_VP9_SEGMENTATION_FLAG_UPDATE_DATA``
+      - Indicates that new parameters are about to be specified for each
+        segment.
+    * - ``V4L2_VP9_SEGMENTATION_FLAG_ABS_OR_DELTA_UPDATE``
+      - Indicates that the segmentation parameters represent the actual values
+        to be used.
+
+.. c:type:: v4l2_vp9_quantization
+
+.. cssclass:: longtable
+
+.. tabularcolumns:: |p{1.5cm}|p{6.3cm}|p{9.4cm}|
+
+.. flat-table:: struct v4l2_vp9_quantization
+    :header-rows:  0
+    :stub-columns: 0
+    :widths:       1 1 2
+
+    * - __u8
+      - ``base_q_idx``
+      - Indicates the base frame qindex.
+    * - __s8
+      - ``delta_q_y_dc``
+      - Indicates the Y DC quantizer relative to base_q_idx.
+    * - __s8
+      - ``delta_q_uv_dc``
+      - Indicates the UV DC quantizer relative to base_q_idx.
+    * - __s8
+      - ``delta_q_uv_ac``
+      - Indicates the UV AC quantizer relative to base_q_idx.
+    * - __u8
+      - ``padding[4]``
+      - Padding bytes used to align this struct on 64 bit. Must be set to 0.
+
+.. c:type:: v4l2_vp9_loop_filter
+
+.. cssclass:: longtable
+
+.. tabularcolumns:: |p{1.5cm}|p{6.3cm}|p{9.4cm}|
+
+.. flat-table:: struct v4l2_vp9_loop_filter
+    :header-rows:  0
+    :stub-columns: 0
+    :widths:       1 1 2
+
+    * - __u8
+      - ``flags``
+      - Combination of V4L2_VP9_LOOP_FILTER_FLAG_* flags.
+        See :c:type:`v4l2_vp9_loop_filter_flags`.
+    * - __u8
+      - ``level``
+      - Indicates the loop filter strength.
+    * - __u8
+      - ``sharpness``
+      - Indicates the sharpness level.
+    * - __s8
+      - ``ref_deltas[4]``
+      - Contains the adjustment needed for the filter level based on the chosen
+        reference frame.
+    * - __s8
+      - ``mode_deltas[2]``
+      - Contains the adjustment needed for the filter level based on the chosen
+        mode
+    * - __u8
+      - ``level_lookup[8][4][2]``
+      - Level lookup table.
+
+
+.. c:type:: v4l2_vp9_loop_filter_flags
+
+.. cssclass:: longtable
+
+.. tabularcolumns:: |p{1.5cm}|p{6.3cm}|p{9.4cm}|
+
+.. flat-table:: enum v4l2_vp9_loop_filter_flags
+    :header-rows:  0
+    :stub-columns: 0
+    :widths:       1 2
+
+    * - ``V4L2_VP9_LOOP_FILTER_FLAG_DELTA_ENABLED``
+      - When set, the filter level depends on the mode and reference frame used
+        to predict a block.
+    * - ``V4L2_VP9_LOOP_FILTER_FLAG_DELTA_UPDATE``
+      - When set, the bitstream contains additional syntax elements that
+        specify which mode and reference frame deltas are to be updated.
diff --git a/Documentation/userspace-api/media/v4l/pixfmt-compressed.rst b/Documentation/userspace-api/media/v4l/pixfmt-compressed.rst
index 6dba70da822b..7e34aeb1cb92 100644
--- a/Documentation/userspace-api/media/v4l/pixfmt-compressed.rst
+++ b/Documentation/userspace-api/media/v4l/pixfmt-compressed.rst
@@ -171,6 +171,21 @@  Compressed Formats
       - VP9 compressed video frame. The encoder generates one
 	compressed frame per buffer, and the decoder requires one
 	compressed frame per buffer.
+    * .. _V4L2-PIX-FMT-VP9_FRAME:
+
+      - ``V4L2_PIX_FMT_VP9_FRAME``
+      - 'VP9F'
+      - VP9 parsed frame, including the frame header, as extracted from the container.
+	This format is adapted for stateless video decoders that implement an
+	VP9 pipeline with the :ref:`stateless_decoder`.
+	Metadata associated with the frame to decode is required to be passed
+	through the ``V4L2_CID_STATELESS_VP9_FRAME_DECODE_PARAMS`` and
+	the ``V4L2_CID_STATELESS_VP9_COMPRESSED_HDR_PROBS`` controls.
+	See the :ref:`associated Codec Control IDs <v4l2-codec-stateless-vp9>`.
+	Exactly one output and one capture buffer must be provided for use with
+	this pixel format. The output buffer must contain the appropriate number
+	of macroblocks to decode a full corresponding frame to the matching
+	capture buffer.
     * .. _V4L2-PIX-FMT-HEVC:
 
       - ``V4L2_PIX_FMT_HEVC``
diff --git a/Documentation/userspace-api/media/v4l/vidioc-g-ext-ctrls.rst b/Documentation/userspace-api/media/v4l/vidioc-g-ext-ctrls.rst
index 3ba22983d21f..3ff72ca63772 100644
--- a/Documentation/userspace-api/media/v4l/vidioc-g-ext-ctrls.rst
+++ b/Documentation/userspace-api/media/v4l/vidioc-g-ext-ctrls.rst
@@ -221,6 +221,14 @@  still cause this situation.
       - ``p_vp8_frame``
       - A pointer to a struct :c:type:`v4l2_ctrl_vp8_frame`. Valid if this control is
         of type ``V4L2_CTRL_TYPE_VP8_FRAME``.
+    * - struct :c:type:`v4l2_ctrl_vp9_compressed_hdr_probs` *
+      - ``p_vp9_compressed_hdr_probs``
+      - A pointer to a struct :c:type:`v4l2_ctrl_vp9_compressed_hdr_probs'. Valid if this contro is
+        of type ``V4L2_CTRL_TYPE_VP9_COMPRESSED_HDR_PROBS``.
+    * - struct :c:type:`v4l2_ctrl_vp9_frame_decode_params` *
+      - ``p_vp9_frame_decode_params``
+      - A pointer to a struct :c:type:`v4l2_ctrl_vp9_frame_decode_params'. Valid if this contro is
+        of type ``V4L2_CTRL_TYPE_VP9_FRAME_DECODE_PARAMS``.
     * - struct :c:type:`v4l2_ctrl_hdr10_cll_info` *
       - ``p_hdr10_cll``
       - A pointer to a struct :c:type:`v4l2_ctrl_hdr10_cll_info`. Valid if this control is
diff --git a/Documentation/userspace-api/media/v4l/vidioc-queryctrl.rst b/Documentation/userspace-api/media/v4l/vidioc-queryctrl.rst
index 8a285daedc6a..85fb8b7a9428 100644
--- a/Documentation/userspace-api/media/v4l/vidioc-queryctrl.rst
+++ b/Documentation/userspace-api/media/v4l/vidioc-queryctrl.rst
@@ -495,6 +495,18 @@  See also the examples in :ref:`control`.
       - n/a
       - A struct :c:type:`v4l2_ctrl_vp8_frame`, containing VP8
 	frame parameters for stateless video decoders.
+    * - ``V4L2_CTRL_TYPE_VP9_COMPRESSED_HDR_PROBS``
+      - n/a
+      - n/a
+      - n/a
+      - A struct :c:type:`v4l2_ctrl_vp9_compressed_hdr_probs`, containing VP9
+	probabilities updates for stateless video decoders.
+    * - ``V4L2_CTRL_TYPE_VP9_FRAME_DECODE_PARAMS``
+      - n/a
+      - n/a
+      - n/a
+      - A struct :c:type:`v4l2_ctrl_vp9_compressed_hdr_probs`, containing VP9
+	frame decode parameters for stateless video decoders.
 
 .. raw:: latex
 
diff --git a/Documentation/userspace-api/media/videodev2.h.rst.exceptions b/Documentation/userspace-api/media/videodev2.h.rst.exceptions
index f59940352faa..fdc6f2b22df8 100644
--- a/Documentation/userspace-api/media/videodev2.h.rst.exceptions
+++ b/Documentation/userspace-api/media/videodev2.h.rst.exceptions
@@ -148,6 +148,8 @@  replace symbol V4L2_CTRL_TYPE_HEVC_SLICE_PARAMS :c:type:`v4l2_ctrl_type`
 replace symbol V4L2_CTRL_TYPE_AREA :c:type:`v4l2_ctrl_type`
 replace symbol V4L2_CTRL_TYPE_FWHT_PARAMS :c:type:`v4l2_ctrl_type`
 replace symbol V4L2_CTRL_TYPE_VP8_FRAME :c:type:`v4l2_ctrl_type`
+replace symbol V4L2_CTRL_TYPE_VP9_COMPRESSED_HDR_PROBS :c:type:`v4l2_ctrl_type`
+replace symbol V4L2_CTRL_TYPE_VP9_FRAME_DECODE_PARAMS :c:type:`v4l2_ctrl_type`
 replace symbol V4L2_CTRL_TYPE_HDR10_CLL_INFO :c:type:`v4l2_ctrl_type`
 replace symbol V4L2_CTRL_TYPE_HDR10_MASTERING_DISPLAY :c:type:`v4l2_ctrl_type`
 
diff --git a/drivers/media/v4l2-core/v4l2-ctrls.c b/drivers/media/v4l2-core/v4l2-ctrls.c
index 0d7fe1bd975a..8de7238593ab 100644
--- a/drivers/media/v4l2-core/v4l2-ctrls.c
+++ b/drivers/media/v4l2-core/v4l2-ctrls.c
@@ -1215,6 +1215,8 @@  const char *v4l2_ctrl_get_name(u32 id)
 	case V4L2_CID_STATELESS_H264_DECODE_PARAMS:		return "H264 Decode Parameters";
 	case V4L2_CID_STATELESS_FWHT_PARAMS:			return "FWHT Stateless Parameters";
 	case V4L2_CID_STATELESS_VP8_FRAME:			return "VP8 Frame Parameters";
+	case V4L2_CID_STATELESS_VP9_COMPRESSED_HDR_PROBS:	return "VP9 Probabilities Updates";
+	case V4L2_CID_STATELESS_VP9_FRAME_DECODE_PARAMS:	return "VP9 Frame Decode Parameters";
 
 	/* Colorimetry controls */
 	/* Keep the order of the 'case's the same as in v4l2-controls.h! */
@@ -1517,6 +1519,12 @@  void v4l2_ctrl_fill(u32 id, const char **name, enum v4l2_ctrl_type *type,
 	case V4L2_CID_STATELESS_VP8_FRAME:
 		*type = V4L2_CTRL_TYPE_VP8_FRAME;
 		break;
+	case V4L2_CID_STATELESS_VP9_FRAME_DECODE_PARAMS:
+		*type = V4L2_CTRL_TYPE_VP9_FRAME_DECODE_PARAMS;
+		break;
+	case V4L2_CID_STATELESS_VP9_COMPRESSED_HDR_PROBS:
+		*type = V4L2_CTRL_TYPE_VP9_COMPRESSED_HDR_PROBS;
+		break;
 	case V4L2_CID_MPEG_VIDEO_HEVC_SPS:
 		*type = V4L2_CTRL_TYPE_HEVC_SPS;
 		break;
@@ -1836,6 +1844,12 @@  static void std_log(const struct v4l2_ctrl *ctrl)
 	case V4L2_CTRL_TYPE_VP8_FRAME:
 		pr_cont("VP8_FRAME");
 		break;
+	case V4L2_CTRL_TYPE_VP9_COMPRESSED_HDR_PROBS:
+		pr_cont("VP9_COMPRESSED_HDR_PROBS");
+		break;
+	case V4L2_CTRL_TYPE_VP9_FRAME_DECODE_PARAMS:
+		pr_cont("VP9_FRAME_DECODE_PARAMS");
+		break;
 	case V4L2_CTRL_TYPE_HDR10_CLL_INFO:
 		pr_cont("HDR10_CLL_INFO");
 		break;
@@ -1869,6 +1883,224 @@  static void std_log(const struct v4l2_ctrl *ctrl)
 	0;							\
 })
 
+static int
+validate_vp9_lf_params(struct v4l2_vp9_loop_filter *lf)
+{
+	unsigned int i, j, k;
+
+	if (lf->flags &
+	    ~(V4L2_VP9_LOOP_FILTER_FLAG_DELTA_ENABLED |
+	      V4L2_VP9_LOOP_FILTER_FLAG_DELTA_UPDATE))
+		return -EINVAL;
+
+	/*
+	 * V4L2_VP9_LOOP_FILTER_FLAG_DELTA_ENABLED implies
+	 * V4L2_VP9_LOOP_FILTER_FLAG_DELTA_UPDATE.
+	 */
+	if (lf->flags & V4L2_VP9_LOOP_FILTER_FLAG_DELTA_UPDATE &&
+	    !(lf->flags & V4L2_VP9_LOOP_FILTER_FLAG_DELTA_ENABLED))
+		return -EINVAL;
+
+	/* That all values are in the accepted range. */
+	if (lf->level > GENMASK(5, 0))
+		return -EINVAL;
+
+	if (lf->sharpness > GENMASK(2, 0))
+		return -EINVAL;
+
+	for (i = 0; i < ARRAY_SIZE(lf->ref_deltas); i++) {
+		if (lf->ref_deltas[i] < -63 || lf->ref_deltas[i] > 63)
+			return -EINVAL;
+	}
+
+	for (i = 0; i < ARRAY_SIZE(lf->mode_deltas); i++) {
+		if (lf->mode_deltas[i] < -63 || lf->mode_deltas[i] > 63)
+			return -EINVAL;
+	}
+
+	for (i = 0; i < ARRAY_SIZE(lf->level_lookup); i++) {
+		for (j = 0; j < ARRAY_SIZE(lf->level_lookup[0]); j++) {
+			for (k = 0; k < ARRAY_SIZE(lf->level_lookup[0][0]); k++) {
+				if (lf->level_lookup[i][j][k] > 63)
+					return -EINVAL;
+			}
+		}
+	}
+
+	return 0;
+}
+
+static int
+validate_vp9_quant_params(struct v4l2_vp9_quantization *quant)
+{
+	if (quant->delta_q_y_dc < -15 || quant->delta_q_y_dc > 15 ||
+	    quant->delta_q_uv_dc < -15 || quant->delta_q_uv_dc > 15 ||
+	    quant->delta_q_uv_ac < -15 || quant->delta_q_uv_ac > 15)
+		return -EINVAL;
+
+	memset(quant->padding, 0, sizeof(quant->padding));
+	return 0;
+}
+
+static int
+validate_vp9_seg_params(struct v4l2_vp9_segmentation *seg)
+{
+	unsigned int i, j;
+
+	if (seg->flags &
+	    ~(V4L2_VP9_SEGMENTATION_FLAG_ENABLED |
+	      V4L2_VP9_SEGMENTATION_FLAG_UPDATE_MAP |
+	      V4L2_VP9_SEGMENTATION_FLAG_TEMPORAL_UPDATE |
+	      V4L2_VP9_SEGMENTATION_FLAG_UPDATE_DATA |
+	      V4L2_VP9_SEGMENTATION_FLAG_ABS_OR_DELTA_UPDATE))
+		return -EINVAL;
+
+	/*
+	 * V4L2_VP9_SEGMENTATION_FLAG_UPDATE_MAP and
+	 * V4L2_VP9_SEGMENTATION_FLAG_UPDATE_DATA imply
+	 * V4L2_VP9_SEGMENTATION_FLAG_ENABLED.
+	 */
+	if ((seg->flags &
+	     (V4L2_VP9_SEGMENTATION_FLAG_UPDATE_MAP |
+	      V4L2_VP9_SEGMENTATION_FLAG_UPDATE_DATA)) &&
+	    !(seg->flags & V4L2_VP9_SEGMENTATION_FLAG_ENABLED))
+		return -EINVAL;
+
+	/*
+	 * V4L2_VP9_SEGMENTATION_FLAG_TEMPORAL_UPDATE implies
+	 * V4L2_VP9_SEGMENTATION_FLAG_UPDATE_MAP.
+	 */
+	if (seg->flags & V4L2_VP9_SEGMENTATION_FLAG_TEMPORAL_UPDATE &&
+	    !(seg->flags & V4L2_VP9_SEGMENTATION_FLAG_UPDATE_MAP))
+		return -EINVAL;
+
+	/*
+	 * V4L2_VP9_SEGMENTATION_FLAG_ABS_OR_DELTA_UPDATE implies
+	 * V4L2_VP9_SEGMENTATION_FLAG_UPDATE_DATA.
+	 */
+	if (seg->flags & V4L2_VP9_SEGMENTATION_FLAG_ABS_OR_DELTA_UPDATE &&
+	    !(seg->flags & V4L2_VP9_SEGMENTATION_FLAG_UPDATE_DATA))
+		return -EINVAL;
+
+	for (i = 0; i < ARRAY_SIZE(seg->feature_enabled); i++) {
+		if (seg->feature_enabled[i] &
+		    ~(V4L2_VP9_SEGMENT_FEATURE_QP_DELTA |
+		      V4L2_VP9_SEGMENT_FEATURE_LF |
+		      V4L2_VP9_SEGMENT_FEATURE_REF_FRAME |
+		      V4L2_VP9_SEGMENT_FEATURE_SKIP))
+			return -EINVAL;
+	}
+
+	for (i = 0; i < ARRAY_SIZE(seg->feature_data); i++) {
+		const int range[] = {255, 63, 3, 0};
+
+		for (j = 0; j < ARRAY_SIZE(seg->feature_data[j]); j++) {
+			if (seg->feature_data[i][j] < -range[j] ||
+			    seg->feature_data[i][j] > range[j])
+				return -EINVAL;
+		}
+	}
+
+	memset(seg->padding, 0, sizeof(seg->padding));
+	return 0;
+}
+
+static int
+validate_vp9_frame_decode_params(struct v4l2_ctrl_vp9_frame_decode_params *dec_params)
+{
+	int ret, i;
+
+	/* Make sure we're not passed invalid flags. */
+	if (dec_params->flags &
+	    ~(V4L2_VP9_FRAME_FLAG_KEY_FRAME |
+	      V4L2_VP9_FRAME_FLAG_SHOW_FRAME |
+	      V4L2_VP9_FRAME_FLAG_ERROR_RESILIENT |
+	      V4L2_VP9_FRAME_FLAG_INTRA_ONLY |
+	      V4L2_VP9_FRAME_FLAG_ALLOW_HIGH_PREC_MV |
+	      V4L2_VP9_FRAME_FLAG_REFRESH_FRAME_CTX |
+	      V4L2_VP9_FRAME_FLAG_PARALLEL_DEC_MODE |
+	      V4L2_VP9_FRAME_FLAG_X_SUBSAMPLING |
+	      V4L2_VP9_FRAME_FLAG_Y_SUBSAMPLING |
+	      V4L2_VP9_FRAME_FLAG_COLOR_RANGE_FULL_SWING))
+		return -EINVAL;
+
+	/*
+	 * The refresh context and error resilient flags are mutually exclusive.
+	 * Same goes for parallel decoding and error resilient modes.
+	 */
+	if (dec_params->flags & V4L2_VP9_FRAME_FLAG_ERROR_RESILIENT &&
+	    dec_params->flags &
+	    (V4L2_VP9_FRAME_FLAG_REFRESH_FRAME_CTX |
+	     V4L2_VP9_FRAME_FLAG_PARALLEL_DEC_MODE))
+		return -EINVAL;
+
+	if (dec_params->profile > V4L2_VP9_PROFILE_MAX)
+		return -EINVAL;
+
+	if (dec_params->reset_frame_context > V4L2_VP9_RESET_FRAME_CTX_ALL)
+		return -EINVAL;
+
+	if (dec_params->frame_context_idx >= V4L2_VP9_NUM_FRAME_CTX)
+		return -EINVAL;
+
+	/*
+	 * Profiles 0 and 1 only support 8-bit depth, profiles 2 and 3 only 10
+	 * and 12 bit depths.
+	 */
+	if ((dec_params->profile < 2 && dec_params->bit_depth != 8) ||
+	    (dec_params->profile >= 2 &&
+	     (dec_params->bit_depth != 10 && dec_params->bit_depth != 12)))
+		return -EINVAL;
+
+	/* Profile 0 and 2 only accept YUV 4:2:0. */
+	if ((dec_params->profile == 0 || dec_params->profile == 2) &&
+	    (!(dec_params->flags & V4L2_VP9_FRAME_FLAG_X_SUBSAMPLING) ||
+	     !(dec_params->flags & V4L2_VP9_FRAME_FLAG_Y_SUBSAMPLING)))
+		return -EINVAL;
+
+	/* Profile 1 and 3 only accept YUV 4:2:2, 4:4:0 and 4:4:4. */
+	if ((dec_params->profile == 1 || dec_params->profile == 3) &&
+	    ((dec_params->flags & V4L2_VP9_FRAME_FLAG_X_SUBSAMPLING) &&
+	     (dec_params->flags & V4L2_VP9_FRAME_FLAG_Y_SUBSAMPLING)))
+		return -EINVAL;
+
+	if (dec_params->interpolation_filter > V4L2_VP9_INTERP_FILTER_SWITCHABLE)
+		return -EINVAL;
+
+	/*
+	 * According to the spec, tile_cols_log2 shall be less than or equal
+	 * to 6.
+	 */
+	if (dec_params->tile_cols_log2 > 6)
+		return -EINVAL;
+
+	if (dec_params->tx_mode > V4L2_VP9_TX_MODE_SELECT)
+		return -EINVAL;
+
+	if (dec_params->reference_mode > V4L2_VP9_REF_MODE_SELECT)
+		return -EINVAL;
+
+	for (i = 0; i < V4L2_REF_ID_CNT + 1; ++i)
+		if (dec_params->ref_frame_sign_bias[i] != 0 &&
+		    dec_params->ref_frame_sign_bias[i] != 1)
+			return -EINVAL;
+
+	ret = validate_vp9_lf_params(&dec_params->lf);
+	if (ret)
+		return ret;
+
+	ret = validate_vp9_quant_params(&dec_params->quant);
+	if (ret)
+		return ret;
+
+	ret = validate_vp9_seg_params(&dec_params->seg);
+	if (ret)
+		return ret;
+
+	memset(dec_params->padding, 0, sizeof(dec_params->padding));
+	return 0;
+}
+
 /* Validate a new control */
 
 #define zero_padding(s) \
@@ -2127,6 +2359,12 @@  static int std_validate_compound(const struct v4l2_ctrl *ctrl, u32 idx,
 		zero_padding(p_vp8_frame->coder_state);
 		break;
 
+	case V4L2_CTRL_TYPE_VP9_FRAME_DECODE_PARAMS:
+		return validate_vp9_frame_decode_params(p);
+
+	case V4L2_CTRL_TYPE_VP9_COMPRESSED_HDR_PROBS:
+		break;
+
 	case V4L2_CTRL_TYPE_HEVC_SPS:
 		p_hevc_sps = p;
 
@@ -2938,6 +3176,12 @@  static struct v4l2_ctrl *v4l2_ctrl_new(struct v4l2_ctrl_handler *hdl,
 	case V4L2_CTRL_TYPE_VP8_FRAME:
 		elem_size = sizeof(struct v4l2_ctrl_vp8_frame);
 		break;
+	case V4L2_CTRL_TYPE_VP9_COMPRESSED_HDR_PROBS:
+		elem_size = sizeof(struct v4l2_ctrl_vp9_compressed_hdr_probs);
+		break;
+	case V4L2_CTRL_TYPE_VP9_FRAME_DECODE_PARAMS:
+		elem_size = sizeof(struct v4l2_ctrl_vp9_frame_decode_params);
+		break;
 	case V4L2_CTRL_TYPE_HEVC_SPS:
 		elem_size = sizeof(struct v4l2_ctrl_hevc_sps);
 		break;
diff --git a/drivers/media/v4l2-core/v4l2-ioctl.c b/drivers/media/v4l2-core/v4l2-ioctl.c
index 6a5d1c6d11d6..dbdafa5ea127 100644
--- a/drivers/media/v4l2-core/v4l2-ioctl.c
+++ b/drivers/media/v4l2-core/v4l2-ioctl.c
@@ -1431,6 +1431,7 @@  static void v4l_fill_fmtdesc(struct v4l2_fmtdesc *fmt)
 		case V4L2_PIX_FMT_VP8:		descr = "VP8"; break;
 		case V4L2_PIX_FMT_VP8_FRAME:    descr = "VP8 Frame"; break;
 		case V4L2_PIX_FMT_VP9:		descr = "VP9"; break;
+		case V4L2_PIX_FMT_VP9_FRAME:    descr = "VP9 Frame"; break;
 		case V4L2_PIX_FMT_HEVC:		descr = "HEVC"; break; /* aka H.265 */
 		case V4L2_PIX_FMT_HEVC_SLICE:	descr = "HEVC Parsed Slice Data"; break;
 		case V4L2_PIX_FMT_FWHT:		descr = "FWHT"; break; /* used in vicodec */
diff --git a/include/media/v4l2-ctrls.h b/include/media/v4l2-ctrls.h
index a5953b812878..8c5fb22ff545 100644
--- a/include/media/v4l2-ctrls.h
+++ b/include/media/v4l2-ctrls.h
@@ -50,6 +50,8 @@  struct video_device;
  * @p_h264_decode_params:	Pointer to a struct v4l2_ctrl_h264_decode_params.
  * @p_h264_pred_weights:	Pointer to a struct v4l2_ctrl_h264_pred_weights.
  * @p_vp8_frame:		Pointer to a VP8 frame params structure.
+ * @p_vp9_compressed_hdr_probs:	Pointer to a VP9 frame compressed header probs structure.
+ * @p_vp9_frame_decode_params:	Pointer to a VP9 frame params structure.
  * @p_hevc_sps:			Pointer to an HEVC sequence parameter set structure.
  * @p_hevc_pps:			Pointer to an HEVC picture parameter set structure.
  * @p_hevc_slice_params:	Pointer to an HEVC slice parameters structure.
@@ -79,6 +81,8 @@  union v4l2_ctrl_ptr {
 	struct v4l2_ctrl_hevc_sps *p_hevc_sps;
 	struct v4l2_ctrl_hevc_pps *p_hevc_pps;
 	struct v4l2_ctrl_hevc_slice_params *p_hevc_slice_params;
+	struct v4l2_ctrl_vp9_compressed_hdr_probs *p_vp9_compressed_hdr_probs;
+	struct v4l2_ctrl_vp9_frame_decode_params *p_vp9_frame_decode_params;
 	struct v4l2_ctrl_hdr10_cll_info *p_hdr10_cll;
 	struct v4l2_ctrl_hdr10_mastering_display *p_hdr10_mastering;
 	struct v4l2_area *p_area;
diff --git a/include/uapi/linux/v4l2-controls.h b/include/uapi/linux/v4l2-controls.h
index d43bec5f1afd..ff5c574f2755 100644
--- a/include/uapi/linux/v4l2-controls.h
+++ b/include/uapi/linux/v4l2-controls.h
@@ -1896,6 +1896,461 @@  struct v4l2_ctrl_hdr10_mastering_display {
 	__u32 min_display_mastering_luminance;
 };
 
+/* Stateless VP9 control */
+
+/**
+ * enum v4l2_vp9_loop_filter_flags - VP9 loop filter flags
+ *
+ * @V4L2_VP9_LOOP_FILTER_FLAG_DELTA_ENABLED: the filter level depends on
+ *					     the mode and reference frame used
+ *					     to predict a block
+ * @V4L2_VP9_LOOP_FILTER_FLAG_DELTA_UPDATE: the bitstream contains additional
+ *					    syntax elements that specify which
+ *					    mode and reference frame deltas
+ *					    are to be updated
+ *
+ * Those are the flags you should pass to &v4l2_vp9_loop_filter.flags. See
+ * section '7.2.8 Loop filter semantics' of the VP9 specification for more
+ * details.
+ */
+enum v4l2_vp9_loop_filter_flags {
+	V4L2_VP9_LOOP_FILTER_FLAG_DELTA_ENABLED = 1 << 0,
+	V4L2_VP9_LOOP_FILTER_FLAG_DELTA_UPDATE = 1 << 1,
+};
+
+/**
+ * struct v4l2_vp9_loop_filter - VP9 loop filter parameters
+ *
+ * @flags: combination of V4L2_VP9_LOOP_FILTER_FLAG_* flags
+ * @level: indicates the loop filter strength
+ * @sharpness: indicates the sharpness level
+ * @ref_deltas: contains the adjustment needed for the filter level based on
+ *		the chosen reference frame
+ * @mode_deltas: contains the adjustment needed for the filter level based on
+ *		 the chosen mode
+ * @level_lookup: level lookup table
+ *
+ * This structure contains all loop filter related parameters. See sections
+ * '7.2.8 Loop filter semantics' and '8.8.1 Loop filter frame init process'
+ * of the VP9 specification for more details.
+ */
+struct v4l2_vp9_loop_filter {
+	__u8 flags;
+	__u8 level;
+	__u8 sharpness;
+	__s8 ref_deltas[4];
+	__s8 mode_deltas[2];
+	__u8 level_lookup[8][4][2];
+	__u8 padding;
+};
+
+/**
+ * struct v4l2_vp9_quantization - VP9 quantization parameters
+ *
+ * @base_q_idx: indicates the base frame qindex
+ * @delta_q_y_dc: indicates the Y DC quantizer relative to base_q_idx
+ * @delta_q_uv_dc: indicates the UV DC quantizer relative to base_q_idx
+ * @delta_q_uv_ac indicates the UV AC quantizer relative to base_q_idx
+ * @padding: padding bytes to align things on 64 bits. Must be set to 0
+ *
+ * Encodes the quantization parameters. See section '7.2.9 Quantization params
+ * syntax' of the VP9 specification for more details.
+ */
+struct v4l2_vp9_quantization {
+	__u8 base_q_idx;
+	__s8 delta_q_y_dc;
+	__s8 delta_q_uv_dc;
+	__s8 delta_q_uv_ac;
+	__u8 padding[4];
+};
+
+/**
+ * enum v4l2_vp9_segmentation_flags - VP9 segmentation flags
+ *
+ * @V4L2_VP9_SEGMENTATION_FLAG_ENABLED: indicates that this frame makes use of
+ *					the segmentation tool
+ * @V4L2_VP9_SEGMENTATION_FLAG_UPDATE_MAP: indicates that the segmentation map
+ *					   should be updated during the
+ *					   decoding of this frame
+ * @V4L2_VP9_SEGMENTATION_FLAG_TEMPORAL_UPDATE: indicates that the updates to
+ *						the segmentation map are coded
+ *						relative to the existing
+ *						segmentation map
+ * @V4L2_VP9_SEGMENTATION_FLAG_UPDATE_DATA: indicates that new parameters are
+ *					    about to be specified for each
+ *					    segment
+ * @V4L2_VP9_SEGMENTATION_FLAG_ABS_OR_DELTA_UPDATE: indicates that the
+ *						    segmentation parameters
+ *						    represent the actual values
+ *						    to be used
+ *
+ * Those are the flags you should pass to &v4l2_vp9_segmentation.flags. See
+ * section '7.2.10 Segmentation params syntax' of the VP9 specification for
+ * more details.
+ */
+enum v4l2_vp9_segmentation_flags {
+	V4L2_VP9_SEGMENTATION_FLAG_ENABLED = 1 << 0,
+	V4L2_VP9_SEGMENTATION_FLAG_UPDATE_MAP = 1 << 1,
+	V4L2_VP9_SEGMENTATION_FLAG_TEMPORAL_UPDATE = 1 << 2,
+	V4L2_VP9_SEGMENTATION_FLAG_UPDATE_DATA = 1 << 3,
+	V4L2_VP9_SEGMENTATION_FLAG_ABS_OR_DELTA_UPDATE = 1 << 4,
+};
+
+#define V4L2_VP9_SEGMENT_FEATURE_ENABLED(id)	(1 << (id))
+#define V4L2_VP9_SEGMENT_FEATURE_ENABLED_MASK	0xf
+
+/**
+ * enum v4l2_vp9_segment_feature - VP9 segment feature IDs
+ *
+ * @V4L2_VP9_SEGMENT_FEATURE_QP_DELTA: QP delta segment feature
+ * @V4L2_VP9_SEGMENT_FEATURE_LF: loop filter segment feature
+ * @V4L2_VP9_SEGMENT_FEATURE_REF_FRAME: reference frame segment feature
+ * @V4L2_VP9_SEGMENT_FEATURE_SKIP: skip segment feature
+ * @V4L2_VP9_SEGMENT_FEATURE_CNT: number of segment features
+ *
+ * Segment feature IDs. See section '7.2.10 Segmentation params syntax' of the
+ * VP9 specification for more details.
+ */
+enum v4l2_vp9_segment_feature {
+	V4L2_VP9_SEGMENT_FEATURE_QP_DELTA,
+	V4L2_VP9_SEGMENT_FEATURE_LF,
+	V4L2_VP9_SEGMENT_FEATURE_REF_FRAME,
+	V4L2_VP9_SEGMENT_FEATURE_SKIP,
+	V4L2_VP9_SEGMENT_FEATURE_CNT,
+};
+
+/**
+ * struct v4l2_vp9_segmentation - VP9 segmentation parameters
+ *
+ * @flags: combination of V4L2_VP9_SEGMENTATION_FLAG_* flags
+ * @tree_probs: specifies the probability values to be used when
+ *              decoding a Segment-ID. See '5.15. Segmentation map'
+ *              section of the VP9 specification for more details.
+ * @pred_prob: specifies the probability values to be used when decoding a
+ *	       Predicted-Segment-ID. See '6.4.14. Get segment id syntax'
+ *	       section of :ref:`vp9` for more details..
+ * @padding: padding used to make things aligned on 64 bits. Shall be zero
+ *	     filled
+ * @feature_enabled: bitmask defining which features are enabled in each
+ *		     segment
+ * @feature_data: data attached to each feature. Data entry is only valid if
+ *		  the feature is enabled
+ *
+ * Encodes the quantization parameters. See section '7.2.10 Segmentation
+ * params syntax' of the VP9 specification for more details.
+ */
+struct v4l2_vp9_segmentation {
+	__u8 flags;
+	__u8 tree_probs[7];
+	__u8 pred_probs[3];
+	__u8 padding[5];
+	__u8 feature_enabled[8];
+	__s16 feature_data[8][4];
+};
+
+/**
+ * enum v4l2_vp9_intra_prediction_mode - VP9 Intra prediction modes
+ *
+ * @V4L2_VP9_INTRA_PRED_DC: DC intra prediction
+ * @V4L2_VP9_INTRA_PRED_MODE_V: vertical intra prediction
+ * @V4L2_VP9_INTRA_PRED_MODE_H: horizontal intra prediction
+ * @V4L2_VP9_INTRA_PRED_MODE_D45: D45 intra prediction
+ * @V4L2_VP9_INTRA_PRED_MODE_D135: D135 intra prediction
+ * @V4L2_VP9_INTRA_PRED_MODE_D117: D117 intra prediction
+ * @V4L2_VP9_INTRA_PRED_MODE_D153: D153 intra prediction
+ * @V4L2_VP9_INTRA_PRED_MODE_D207: D207 intra prediction
+ * @V4L2_VP9_INTRA_PRED_MODE_D63: D63 intra prediction
+ * @V4L2_VP9_INTRA_PRED_MODE_TM: True Motion intra prediction
+ *
+ * See section '7.4.5 Intra frame mode info semantics' for more details.
+ */
+enum v4l2_vp9_intra_prediction_mode {
+	V4L2_VP9_INTRA_PRED_MODE_DC,
+	V4L2_VP9_INTRA_PRED_MODE_V,
+	V4L2_VP9_INTRA_PRED_MODE_H,
+	V4L2_VP9_INTRA_PRED_MODE_D45,
+	V4L2_VP9_INTRA_PRED_MODE_D135,
+	V4L2_VP9_INTRA_PRED_MODE_D117,
+	V4L2_VP9_INTRA_PRED_MODE_D153,
+	V4L2_VP9_INTRA_PRED_MODE_D207,
+	V4L2_VP9_INTRA_PRED_MODE_D63,
+	V4L2_VP9_INTRA_PRED_MODE_TM,
+};
+
+/**
+ * enum v4l2_vp9_reset_frame_context - Valid values for
+ *			&v4l2_ctrl_vp9_frame_decode_params->reset_frame_context
+ *
+ * @V4L2_VP9_RESET_FRAME_CTX_NONE: don't reset any frame context
+ * @V4L2_VP9_RESET_FRAME_CTX_SPEC: reset the frame context pointed by
+ *			&v4l2_ctrl_vp9_frame_decode_params.frame_context_idx
+ * @V4L2_VP9_RESET_FRAME_CTX_ALL: reset all frame contexts
+ *
+ * See section '7.2 Uncompressed header semantics' of the VP9 specification
+ * for more details.
+ */
+enum v4l2_vp9_reset_frame_context {
+	V4L2_VP9_RESET_FRAME_CTX_NONE,
+	V4L2_VP9_RESET_FRAME_CTX_SPEC,
+	V4L2_VP9_RESET_FRAME_CTX_ALL,
+};
+
+/**
+ * enum v4l2_vp9_interpolation_filter - VP9 interpolation filter types
+ *
+ * @V4L2_VP9_INTERP_FILTER_8TAP: height tap filter
+ * @V4L2_VP9_INTERP_FILTER_8TAP_SMOOTH: height tap smooth filter
+ * @V4L2_VP9_INTERP_FILTER_8TAP_SHARP: height tap sharp filter
+ * @V4L2_VP9_INTERP_FILTER_BILINEAR: bilinear filter
+ * @V4L2_VP9_INTERP_FILTER_SWITCHABLE: filter selection is signaled at the
+ *				       block level
+ *
+ * See section '7.2.7 Interpolation filter semantics' of the VP9 specification
+ * for more details.
+ */
+enum v4l2_vp9_interpolation_filter {
+	V4L2_VP9_INTERP_FILTER_8TAP,
+	V4L2_VP9_INTERP_FILTER_8TAP_SMOOTH,
+	V4L2_VP9_INTERP_FILTER_8TAP_SHARP,
+	V4L2_VP9_INTERP_FILTER_BILINEAR,
+	V4L2_VP9_INTERP_FILTER_SWITCHABLE,
+};
+
+/**
+ * enum v4l2_vp9_reference_mode - VP9 reference modes
+ *
+ * @V4L2_VP9_REF_MODE_SINGLE: indicates that all the inter blocks use only a
+ *			      single reference frame to generate motion
+ *			      compensated prediction
+ * @V4L2_VP9_REF_MODE_COMPOUND: requires all the inter blocks to use compound
+ *				mode. Single reference frame prediction is not
+ *				allowed
+ * @V4L2_VP9_REF_MODE_SELECT: allows each individual inter block to select
+ *			      between single and compound prediction modes
+ *
+ * See section '7.3.6 Frame reference mode semantics' of the VP9 specification
+ * for more details.
+ */
+enum v4l2_vp9_reference_mode {
+	V4L2_VP9_REF_MODE_SINGLE,
+	V4L2_VP9_REF_MODE_COMPOUND,
+	V4L2_VP9_REF_MODE_SELECT,
+};
+
+/**
+ * enum v4l2_vp9_tx_mode - VP9 TX modes
+ *
+ * @V4L2_VP9_TX_MODE_ONLY_4X4: transform size is 4x4
+ * @V4L2_VP9_TX_MODE_ALLOW_8X8: transform size can be up to 8x8
+ * @V4L2_VP9_TX_MODE_ALLOW_16X16: transform size can be up to 16x16
+ * @V4L2_VP9_TX_MODE_ALLOW_32X32: transform size can be up to 32x32
+ * @V4L2_VP9_TX_MODE_SELECT: bitstream contains transform size for each block
+ *
+ * See section '7.3.1 Tx mode semantics' of the VP9 specification for more
+ * details.
+ */
+enum v4l2_vp9_tx_mode {
+	V4L2_VP9_TX_MODE_ONLY_4X4,
+	V4L2_VP9_TX_MODE_ALLOW_8X8,
+	V4L2_VP9_TX_MODE_ALLOW_16X16,
+	V4L2_VP9_TX_MODE_ALLOW_32X32,
+	V4L2_VP9_TX_MODE_SELECT,
+};
+
+/**
+ * enum v4l2_vp9_ref_id - VP9 Reference frame IDs
+ *
+ * @V4L2_REF_ID_LAST: last reference frame
+ * @V4L2_REF_ID_GOLDEN: golden reference frame
+ * @V4L2_REF_ID_ALTREF: alternative reference frame
+ * @V4L2_REF_ID_CNT: number of reference frames
+ *
+ * See section '7.4.12 Ref frames semantics' of the VP9 specification for more
+ * details.
+ */
+enum v4l2_vp9_ref_id {
+	V4L2_REF_ID_LAST,
+	V4L2_REF_ID_GOLDEN,
+	V4L2_REF_ID_ALTREF,
+	V4L2_REF_ID_CNT,
+};
+
+/**
+ * enum v4l2_vp9_frame_flags - VP9 frame flags
+ * @V4L2_VP9_FRAME_FLAG_KEY_FRAME: the frame is a key frame
+ * @V4L2_VP9_FRAME_FLAG_SHOW_FRAME: the frame should be displayed
+ * @V4L2_VP9_FRAME_FLAG_ERROR_RESILIENT: the decoding should be error resilient
+ * @V4L2_VP9_FRAME_FLAG_INTRA_ONLY: the frame does not reference other frames
+ * @V4L2_VP9_FRAME_FLAG_ALLOW_HIGH_PREC_MV: the frame might can high precision
+ *					    motion vectors
+ * @V4L2_VP9_FRAME_FLAG_REFRESH_FRAME_CTX: frame context should be updated
+ *					   after decoding
+ * @V4L2_VP9_FRAME_FLAG_PARALLEL_DEC_MODE: parallel decoding is used
+ * @V4L2_VP9_FRAME_FLAG_X_SUBSAMPLING: vertical subsampling is enabled
+ * @V4L2_VP9_FRAME_FLAG_Y_SUBSAMPLING: horizontal subsampling is enabled
+ * @V4L2_VP9_FRAME_FLAG_COLOR_RANGE_FULL_SWING: full UV range is used
+ *
+ * Check the VP9 specification for more details.
+ */
+enum v4l2_vp9_frame_flags {
+	V4L2_VP9_FRAME_FLAG_KEY_FRAME = 1 << 0,
+	V4L2_VP9_FRAME_FLAG_SHOW_FRAME = 1 << 1,
+	V4L2_VP9_FRAME_FLAG_ERROR_RESILIENT = 1 << 2,
+	V4L2_VP9_FRAME_FLAG_INTRA_ONLY = 1 << 3,
+	V4L2_VP9_FRAME_FLAG_ALLOW_HIGH_PREC_MV = 1 << 4,
+	V4L2_VP9_FRAME_FLAG_REFRESH_FRAME_CTX = 1 << 5,
+	V4L2_VP9_FRAME_FLAG_PARALLEL_DEC_MODE = 1 << 6,
+	V4L2_VP9_FRAME_FLAG_X_SUBSAMPLING = 1 << 7,
+	V4L2_VP9_FRAME_FLAG_Y_SUBSAMPLING = 1 << 8,
+	V4L2_VP9_FRAME_FLAG_COLOR_RANGE_FULL_SWING = 1 << 9,
+};
+
+#define V4L2_VP9_PROFILE_MAX		3
+
+#define V4L2_CID_STATELESS_VP9_FRAME_DECODE_PARAMS	(V4L2_CID_CODEC_STATELESS_BASE + 300)
+/**
+ * struct v4l2_ctrl_vp9_frame_decode_params - VP9 frame decoding control
+ *
+ * @flags: combination of V4L2_VP9_FRAME_FLAG_* flags
+ * @compressed_header_size: compressed header size in bytes
+ * @uncompressed_header_size: uncompressed header size in bytes
+ * @profile: VP9 profile. Can be 0, 1, 2 or 3
+ * @reset_frame_context: specifies whether the frame context should be reset
+ *			 to default values. See &v4l2_vp9_reset_frame_context
+ *			 for more details
+ * @frame_context_idx: frame context that should be used/updated
+ * @bit_depth: bits per components. Can be 8, 10 or 12. Note that not all
+ *	       profiles support 10 and/or 12 bits depths
+ * @interpolation_filter: specifies the filter selection used for performing
+ *			  inter prediction. See &v4l2_vp9_interpolation_filter
+ *			  for more details
+ * @tile_cols_log2: specifies the base 2 logarithm of the width of each tile
+ *		    (where the width is measured in units of 8x8 blocks).
+ *		    Shall be less than or equal to 6
+ * @tile_rows_log2: specifies the base 2 logarithm of the height of each tile
+ *		    (where the height is measured in units of 8x8 blocks)
+ * @tx_mode: specifies the TX mode. See &v4l2_vp9_tx_mode for more details
+ * @reference_mode: specifies the type of inter prediction to be used. See
+ *		    &v4l2_vp9_reference_mode for more details
+ * @padding: needed to make this struct 64 bit aligned. Shall be filled with
+ *	     zeros
+ * @frame_width_minus_1: add 1 to it and you'll get the frame width expressed
+ *			 in pixels
+ * @frame_height_minus_1: add 1 to it and you'll get the frame height expressed
+ *			  in pixels
+ * @render_width_minus_1: add 1 to it and you'll get the expected render width
+ *			 expressed in pixels. This is not used during the
+ *			 decoding process but might be used by HW scalers to
+ *			 prepare a frame that's ready for scanout
+ * @render_height_minus_1: add 1 to it and you'll get the expected render height
+ *			 expressed in pixels. This is not used during the
+ *			 decoding process but might be used by HW scalers to
+ *			 prepare a frame that's ready for scanout
+ * @refs: array of ref frames timestamps. See &v4l2_vp9_ref_id for more details
+ * @ref_frame_sign_bias: array of reference frames motion vector sign bias
+ *			(prediction direction)
+ * @lf: loop filter parameters. See &v4l2_vp9_loop_filter for more details
+ * @quant: quantization parameters. See &v4l2_vp9_quantization for more details
+ * @seg: segmentation parameters. See &v4l2_vp9_segmentation for more details
+ */
+struct v4l2_ctrl_vp9_frame_decode_params {
+	__u32 flags;
+	__u16 compressed_header_size;
+	__u16 uncompressed_header_size;
+	__u8 profile;
+	__u8 reset_frame_context;
+	__u8 frame_context_idx;
+	__u8 bit_depth;
+	__u8 interpolation_filter;
+	__u8 tile_cols_log2;
+	__u8 tile_rows_log2;
+	__u8 tx_mode;
+	__u8 reference_mode;
+	__u8 padding[7];
+	__u16 frame_width_minus_1;
+	__u16 frame_height_minus_1;
+	__u16 render_width_minus_1;
+	__u16 render_height_minus_1;
+	__u64 refs[V4L2_REF_ID_CNT];
+	__u8 ref_frame_sign_bias[V4L2_REF_ID_CNT + 1];
+	struct v4l2_vp9_loop_filter lf;
+	struct v4l2_vp9_quantization quant;
+	struct v4l2_vp9_segmentation seg;
+};
+
+#define V4L2_VP9_NUM_FRAME_CTX	4
+
+/**
+ * struct v4l2_vp9_mv_compressed_hdr_probs - VP9 Motion vector probability updates
+ * @joint: motion vector joint probability updates
+ * @sign: motion vector sign probability updates
+ * @class: motion vector class probability updates
+ * @class0_bit: motion vector class0 bit probability updates
+ * @bits: motion vector bits probability updates
+ * @class0_fr: motion vector class0 fractional bit probability updates
+ * @fr: motion vector fractional bit probability updates
+ * @class0_hp: motion vector class0 high precision fractional bit probability updates
+ * @hp: motion vector high precision fractional bit probability updates
+ *
+ * This structure contains new values of motion vector probabilities.
+ * A value of zero means there is no update.
+ * See `struct v4l2_vp9_prob_updates` for details.
+ */
+struct v4l2_vp9_mv_compressed_hdr_probs {
+	__u8 joint[3];
+	__u8 sign[2];
+	__u8 class[2][10];
+	__u8 class0_bit[2];
+	__u8 bits[2][10];
+	__u8 class0_fr[2][2][3];
+	__u8 fr[2][3];
+	__u8 class0_hp[2];
+	__u8 hp[2];
+};
+
+#define V4L2_CID_STATELESS_VP9_COMPRESSED_HDR_PROBS	(V4L2_CID_CODEC_STATELESS_BASE + 301)
+/**
+ * struct v4l2_ctrl_vp9_compressed_hdr_probs - VP9 probability updates control
+ * @tx8: TX 8x8 probability updates
+ * @tx16: TX 16x16 probability updates
+ * @tx32: TX 32x32 probability updates
+ * @coef: coefficient probability updates
+ * @skip: skip probability updates
+ * @inter_mode: inter mode probability updates
+ * @interp_filter: interpolation filter probability updates
+ * @is_inter: is inter-block probability updates
+ * @comp_mode: compound prediction mode probability updates
+ * @single_ref: single ref probability updates
+ * @comp_ref: compound ref probability updates
+ * @y_mode: Y prediction mode probability updates
+ * @uv_mode: UV prediction mode probability updates
+ * @partition: partition probability updates
+ * @mv: motion vector probability updates
+ *
+ * This structure holds the probabilities update as parsed in the compressed
+ * header (Spec 6.3). These values represent the value of probability update after
+ * being translated with inv_map_table[] (see 6.3.5). A value of zero means that
+ * there is no update.
+ */
+struct v4l2_ctrl_vp9_compressed_hdr_probs {
+	__u8 tx8[2][1];
+	__u8 tx16[2][2];
+	__u8 tx32[2][3];
+	__u8 coef[4][2][2][6][6][3];
+	__u8 skip[3];
+	__u8 inter_mode[7][3];
+	__u8 interp_filter[4][2];
+	__u8 is_inter[4];
+	__u8 comp_mode[5];
+	__u8 single_ref[5][2];
+	__u8 comp_ref[5];
+	__u8 y_mode[4][9];
+	__u8 uv_mode[10][9];
+	__u8 partition[16][3];
+
+	struct v4l2_vp9_mv_compressed_hdr_probs mv;
+};
+
 /* MPEG-compression definitions kept for backwards compatibility */
 #ifndef __KERNEL__
 #define V4L2_CTRL_CLASS_MPEG            V4L2_CTRL_CLASS_CODEC
diff --git a/include/uapi/linux/videodev2.h b/include/uapi/linux/videodev2.h
index 311a01cc5775..508e2d6825b1 100644
--- a/include/uapi/linux/videodev2.h
+++ b/include/uapi/linux/videodev2.h
@@ -697,6 +697,7 @@  struct v4l2_pix_format {
 #define V4L2_PIX_FMT_VP8      v4l2_fourcc('V', 'P', '8', '0') /* VP8 */
 #define V4L2_PIX_FMT_VP8_FRAME v4l2_fourcc('V', 'P', '8', 'F') /* VP8 parsed frame */
 #define V4L2_PIX_FMT_VP9      v4l2_fourcc('V', 'P', '9', '0') /* VP9 */
+#define V4L2_PIX_FMT_VP9_FRAME v4l2_fourcc('V', 'P', '9', 'F') /* VP9 parsed frame */
 #define V4L2_PIX_FMT_HEVC     v4l2_fourcc('H', 'E', 'V', 'C') /* HEVC aka H.265 */
 #define V4L2_PIX_FMT_FWHT     v4l2_fourcc('F', 'W', 'H', 'T') /* Fast Walsh Hadamard Transform (vicodec) */
 #define V4L2_PIX_FMT_FWHT_STATELESS     v4l2_fourcc('S', 'F', 'W', 'H') /* Stateless FWHT (vicodec) */
@@ -1747,6 +1748,8 @@  struct v4l2_ext_control {
 		struct v4l2_ctrl_h264_decode_params __user *p_h264_decode_params;
 		struct v4l2_ctrl_fwht_params __user *p_fwht_params;
 		struct v4l2_ctrl_vp8_frame __user *p_vp8_frame;
+		struct v4l2_ctrl_vp9_compressed_hdr_probs __user *p_vp9_compressed_hdr_probs;
+		struct v4l2_ctrl_vp9_frame_decode_params __user *p_vp9_frame_decode_params;
 		void __user *ptr;
 	};
 } __attribute__ ((packed));
@@ -1807,6 +1810,9 @@  enum v4l2_ctrl_type {
 	V4L2_CTRL_TYPE_FWHT_PARAMS	    = 0x0220,
 
 	V4L2_CTRL_TYPE_VP8_FRAME            = 0x0240,
+
+	V4L2_CTRL_TYPE_VP9_COMPRESSED_HDR_PROBS	= 0x0260,
+	V4L2_CTRL_TYPE_VP9_FRAME_DECODE_PARAMS	= 0x0261,
 };
 
 /*  Used in the VIDIOC_QUERYCTRL ioctl for querying controls */