diff mbox series

[v4,1/9] media: v4l2-subdv: Introduce [get|set]_mbus_config pad ops

Message ID 20200611161651.264633-2-jacopo+renesas@jmondi.org (mailing list archive)
State New, archived
Headers show
Series v4l2-subdev: Introduce [g|s]et_mbus_format pad op | expand

Commit Message

Jacopo Mondi June 11, 2020, 4:16 p.m. UTC
Introduce two new pad operations to allow retrieving and configuring the
media bus parameters on a subdevice pad.

The newly introduced operations aims to replace the s/g_mbus_config video
operations, which have been on their way for deprecation since a long
time.

Signed-off-by: Jacopo Mondi <jacopo+renesas@jmondi.org>
---
 include/media/v4l2-subdev.h | 27 +++++++++++++++++++++++++++
 1 file changed, 27 insertions(+)

Comments

Sakari Ailus June 15, 2020, 8:36 a.m. UTC | #1
Hi Jacopo,

s/subd\Kv/ev/ in the subject.

On Thu, Jun 11, 2020 at 06:16:43PM +0200, Jacopo Mondi wrote:
> Introduce two new pad operations to allow retrieving and configuring the
> media bus parameters on a subdevice pad.
> 
> The newly introduced operations aims to replace the s/g_mbus_config video
> operations, which have been on their way for deprecation since a long
> time.
> 
> Signed-off-by: Jacopo Mondi <jacopo+renesas@jmondi.org>
> ---
>  include/media/v4l2-subdev.h | 27 +++++++++++++++++++++++++++
>  1 file changed, 27 insertions(+)
> 
> diff --git a/include/media/v4l2-subdev.h b/include/media/v4l2-subdev.h
> index f7fe78a6f65a..90d9dfa92cf0 100644
> --- a/include/media/v4l2-subdev.h
> +++ b/include/media/v4l2-subdev.h
> @@ -670,6 +670,29 @@ struct v4l2_subdev_pad_config {
>   *
>   * @set_frame_desc: set the low level media bus frame parameters, @fd array
>   *                  may be adjusted by the subdev driver to device capabilities.
> + *
> + * @get_mbus_config: get the media bus configuration of a remote sub-device.
> + *		     The media bus configuration is usually retrieved from the
> + *		     firmware interface at sub-device probe time, immediately
> + *		     applied to the hardware and eventually adjusted by the
> + *		     driver. Remote sub-devices (usually video receivers) shall
> + *		     use this operation to query the transmitting end bus
> + *		     configuration in order to adjust their own one accordingly.
> + *		     Callers should make sure they get the most up-to-date as
> + *		     possible configuration from the remote end, likely calling
> + *		     this operation as close as possible to stream on time. The
> + *		     operation is allowed to fail if the pad index it has been
> + *		     called on is not valid.

Shouldn't it always fail in that case? I.e. s/is allowed to/shall/ .

> + *
> + * @set_mbus_config: set the media bus configuration of a remote sub-device.
> + *		     This operations is intended to allow, in combination with
> + *		     the get_mbus_config operation, the negotiation of media bus
> + *		     configuration parameters between media sub-devices. The
> + *		     operation shall not fail if the requested configuration is
> + *		     not supported, but the driver shall update the content of
> + *		     the %config argument to reflect what has been actually
> + *		     applied to the hardware. The operation is allowed to fail
> + *		     if the pad index it has been called on is not valid.
>   */
>  struct v4l2_subdev_pad_ops {
>  	int (*init_cfg)(struct v4l2_subdev *sd,
> @@ -710,6 +733,10 @@ struct v4l2_subdev_pad_ops {
>  			      struct v4l2_mbus_frame_desc *fd);
>  	int (*set_frame_desc)(struct v4l2_subdev *sd, unsigned int pad,
>  			      struct v4l2_mbus_frame_desc *fd);
> +	int (*get_mbus_config)(struct v4l2_subdev *sd, unsigned int pad,
> +			       struct v4l2_mbus_config *config);
> +	int (*set_mbus_config)(struct v4l2_subdev *sd, unsigned int pad,
> +			       struct v4l2_mbus_config *config);
>  };
>  
>  /**
diff mbox series

Patch

diff --git a/include/media/v4l2-subdev.h b/include/media/v4l2-subdev.h
index f7fe78a6f65a..90d9dfa92cf0 100644
--- a/include/media/v4l2-subdev.h
+++ b/include/media/v4l2-subdev.h
@@ -670,6 +670,29 @@  struct v4l2_subdev_pad_config {
  *
  * @set_frame_desc: set the low level media bus frame parameters, @fd array
  *                  may be adjusted by the subdev driver to device capabilities.
+ *
+ * @get_mbus_config: get the media bus configuration of a remote sub-device.
+ *		     The media bus configuration is usually retrieved from the
+ *		     firmware interface at sub-device probe time, immediately
+ *		     applied to the hardware and eventually adjusted by the
+ *		     driver. Remote sub-devices (usually video receivers) shall
+ *		     use this operation to query the transmitting end bus
+ *		     configuration in order to adjust their own one accordingly.
+ *		     Callers should make sure they get the most up-to-date as
+ *		     possible configuration from the remote end, likely calling
+ *		     this operation as close as possible to stream on time. The
+ *		     operation is allowed to fail if the pad index it has been
+ *		     called on is not valid.
+ *
+ * @set_mbus_config: set the media bus configuration of a remote sub-device.
+ *		     This operations is intended to allow, in combination with
+ *		     the get_mbus_config operation, the negotiation of media bus
+ *		     configuration parameters between media sub-devices. The
+ *		     operation shall not fail if the requested configuration is
+ *		     not supported, but the driver shall update the content of
+ *		     the %config argument to reflect what has been actually
+ *		     applied to the hardware. The operation is allowed to fail
+ *		     if the pad index it has been called on is not valid.
  */
 struct v4l2_subdev_pad_ops {
 	int (*init_cfg)(struct v4l2_subdev *sd,
@@ -710,6 +733,10 @@  struct v4l2_subdev_pad_ops {
 			      struct v4l2_mbus_frame_desc *fd);
 	int (*set_frame_desc)(struct v4l2_subdev *sd, unsigned int pad,
 			      struct v4l2_mbus_frame_desc *fd);
+	int (*get_mbus_config)(struct v4l2_subdev *sd, unsigned int pad,
+			       struct v4l2_mbus_config *config);
+	int (*set_mbus_config)(struct v4l2_subdev *sd, unsigned int pad,
+			       struct v4l2_mbus_config *config);
 };
 
 /**