diff mbox series

[v3,05/17] video/hdmi: Add Unpack only function for DRM infoframe

Message ID 20200203232014.906651-6-gwan-gyeong.mun@intel.com (mailing list archive)
State New, archived
Headers show
Series In order to readout DP SDPs, refactors the handling of DP SDPs | expand

Commit Message

Gwan-gyeong Mun Feb. 3, 2020, 11:20 p.m. UTC 
It adds an unpack only function for DRM infoframe for dynamic range and
mastering infoframe readout.
It unpacks the information data block contained in the binary buffer into
a structured frame of the HDMI Dynamic Range and Mastering (DRM)
information frame.

In contrast to hdmi_drm_infoframe_unpack() function, it does not verify
a checksum.

It can be used for unpacking a DP HDR Metadata Infoframe SDP case.
DP HDR Metadata Infoframe SDP uses the same Dynamic Range and Mastering
(DRM) information (CTA-861-G spec.) such as HDMI DRM infoframe.
But DP SDP header and payload structure are different from HDMI DRM
Infoframe. Therefore unpacking DRM infoframe for DP requires skipping of
a verifying checksum.

Signed-off-by: Gwan-gyeong Mun <gwan-gyeong.mun@intel.com>
---
 drivers/video/hdmi.c | 58 +++++++++++++++++++++++++++++++-------------
 include/linux/hdmi.h |  2 ++
 2 files changed, 43 insertions(+), 17 deletions(-)

Comments

Shankar, Uma Feb. 5, 2020, 4:15 p.m. UTC | #1 
> -----Original Message-----
> From: Intel-gfx <intel-gfx-bounces@lists.freedesktop.org> On Behalf Of Gwan-
> gyeong Mun
> Sent: Tuesday, February 4, 2020 4:50 AM
> To: intel-gfx@lists.freedesktop.org
> Cc: linux-fbdev@vger.kernel.org; dri-devel@lists.freedesktop.org
> Subject: [Intel-gfx] [PATCH v3 05/17] video/hdmi: Add Unpack only function for DRM
> infoframe
> 
> It adds an unpack only function for DRM infoframe for dynamic range and mastering
> infoframe readout.
> It unpacks the information data block contained in the binary buffer into a structured
> frame of the HDMI Dynamic Range and Mastering (DRM) information frame.
> 
> In contrast to hdmi_drm_infoframe_unpack() function, it does not verify a
> checksum.
> 
> It can be used for unpacking a DP HDR Metadata Infoframe SDP case.
> DP HDR Metadata Infoframe SDP uses the same Dynamic Range and Mastering
> (DRM) information (CTA-861-G spec.) such as HDMI DRM infoframe.
> But DP SDP header and payload structure are different from HDMI DRM Infoframe.
> Therefore unpacking DRM infoframe for DP requires skipping of a verifying
> checksum.

Looks good to me.
Reviewed-by: Uma Shankar <uma.shankar@intel.com>

> Signed-off-by: Gwan-gyeong Mun <gwan-gyeong.mun@intel.com>
> ---
>  drivers/video/hdmi.c | 58 +++++++++++++++++++++++++++++++-------------
>  include/linux/hdmi.h |  2 ++
>  2 files changed, 43 insertions(+), 17 deletions(-)
> 
> diff --git a/drivers/video/hdmi.c b/drivers/video/hdmi.c index
> 9c82e2a0a411..9818836d82b7 100644
> --- a/drivers/video/hdmi.c
> +++ b/drivers/video/hdmi.c
> @@ -1775,20 +1775,18 @@ hdmi_vendor_any_infoframe_unpack(union
> hdmi_vendor_any_infoframe *frame,  }
> 
>  /**
> - * hdmi_drm_infoframe_unpack() - unpack binary buffer to a HDMI DRM infoframe
> + * hdmi_drm_infoframe_unpack_only() - unpack binary buffer to a HDMI
> + DRM infoframe
>   * @frame: HDMI DRM infoframe
>   * @buffer: source buffer
>   * @size: size of buffer
>   *
> - * Unpacks the information contained in binary @buffer into a structured
> + * Unpacks the information data block contained in binary @buffer into
> + a structured
>   * @frame of the HDMI Dynamic Range and Mastering (DRM) information frame.
> - * Also verifies the checksum as required by section 5.3.5 of the HDMI 1.4
> - * specification.
>   *
>   * Returns 0 on success or a negative error code on failure.
>   */
> -static int hdmi_drm_infoframe_unpack(struct hdmi_drm_infoframe *frame,
> -				     const void *buffer, size_t size)
> +int hdmi_drm_infoframe_unpack_only(struct hdmi_drm_infoframe *frame,
> +				   const void *buffer, size_t size)
>  {
>  	const u8 *ptr = buffer;
>  	const u8 *temp;
> @@ -1797,23 +1795,13 @@ static int hdmi_drm_infoframe_unpack(struct
> hdmi_drm_infoframe *frame,
>  	int ret;
>  	int i;
> 
> -	if (size < HDMI_INFOFRAME_SIZE(DRM))
> -		return -EINVAL;
> -
> -	if (ptr[0] != HDMI_INFOFRAME_TYPE_DRM ||
> -	    ptr[1] != 1 ||
> -	    ptr[2] != HDMI_DRM_INFOFRAME_SIZE)
> -		return -EINVAL;
> -
> -	if (hdmi_infoframe_checksum(buffer, HDMI_INFOFRAME_SIZE(DRM)) != 0)
> +	if (size < HDMI_DRM_INFOFRAME_SIZE)
>  		return -EINVAL;
> 
>  	ret = hdmi_drm_infoframe_init(frame);
>  	if (ret)
>  		return ret;
> 
> -	ptr += HDMI_INFOFRAME_HEADER_SIZE;
> -
>  	frame->eotf = ptr[0] & 0x7;
>  	frame->metadata_type = ptr[1] & 0x7;
> 
> @@ -1837,6 +1825,42 @@ static int hdmi_drm_infoframe_unpack(struct
> hdmi_drm_infoframe *frame,
> 
>  	return 0;
>  }
> +EXPORT_SYMBOL(hdmi_drm_infoframe_unpack_only);
> +
> +/**
> + * hdmi_drm_infoframe_unpack() - unpack binary buffer to a HDMI DRM
> +infoframe
> + * @frame: HDMI DRM infoframe
> + * @buffer: source buffer
> + * @size: size of buffer
> + *
> + * Unpacks the information contained in binary @buffer into a
> +structured
> + * @frame of the HDMI Dynamic Range and Mastering (DRM) information frame.
> + * Also verifies the checksum as required by section 5.3.5 of the HDMI
> +1.4
> + * specification.
> + *
> + * Returns 0 on success or a negative error code on failure.
> + */
> +static int hdmi_drm_infoframe_unpack(struct hdmi_drm_infoframe *frame,
> +				     const void *buffer, size_t size) {
> +	const u8 *ptr = buffer;
> +	int ret;
> +
> +	if (size < HDMI_INFOFRAME_SIZE(DRM))
> +		return -EINVAL;
> +
> +	if (ptr[0] != HDMI_INFOFRAME_TYPE_DRM ||
> +	    ptr[1] != 1 ||
> +	    ptr[2] != HDMI_DRM_INFOFRAME_SIZE)
> +		return -EINVAL;
> +
> +	if (hdmi_infoframe_checksum(buffer, HDMI_INFOFRAME_SIZE(DRM)) != 0)
> +		return -EINVAL;
> +
> +	ret = hdmi_drm_infoframe_unpack_only(frame, ptr +
> HDMI_INFOFRAME_HEADER_SIZE,
> +					     size - HDMI_INFOFRAME_HEADER_SIZE);
> +	return ret;
> +}
> 
>  /**
>   * hdmi_infoframe_unpack() - unpack binary buffer to a HDMI infoframe diff --git
> a/include/linux/hdmi.h b/include/linux/hdmi.h index 9918a6c910c5..afb43efc03e0
> 100644
> --- a/include/linux/hdmi.h
> +++ b/include/linux/hdmi.h
> @@ -219,6 +219,8 @@ ssize_t hdmi_drm_infoframe_pack(struct
> hdmi_drm_infoframe *frame, void *buffer,  ssize_t
> hdmi_drm_infoframe_pack_only(const struct hdmi_drm_infoframe *frame,
>  				     void *buffer, size_t size);
>  int hdmi_drm_infoframe_check(struct hdmi_drm_infoframe *frame);
> +int hdmi_drm_infoframe_unpack_only(struct hdmi_drm_infoframe *frame,
> +				   const void *buffer, size_t size);
> 
>  enum hdmi_spd_sdi {
>  	HDMI_SPD_SDI_UNKNOWN,
> --
> 2.24.1
> 
> _______________________________________________
> Intel-gfx mailing list
> Intel-gfx@lists.freedesktop.org
> https://lists.freedesktop.org/mailman/listinfo/intel-gfx
diff mbox series

Patch

diff --git a/drivers/video/hdmi.c b/drivers/video/hdmi.c
index 9c82e2a0a411..9818836d82b7 100644
--- a/drivers/video/hdmi.c
+++ b/drivers/video/hdmi.c
@@ -1775,20 +1775,18 @@  hdmi_vendor_any_infoframe_unpack(union hdmi_vendor_any_infoframe *frame,
 }
 
 /**
- * hdmi_drm_infoframe_unpack() - unpack binary buffer to a HDMI DRM infoframe
+ * hdmi_drm_infoframe_unpack_only() - unpack binary buffer to a HDMI DRM infoframe
  * @frame: HDMI DRM infoframe
  * @buffer: source buffer
  * @size: size of buffer
  *
- * Unpacks the information contained in binary @buffer into a structured
+ * Unpacks the information data block contained in binary @buffer into a structured
  * @frame of the HDMI Dynamic Range and Mastering (DRM) information frame.
- * Also verifies the checksum as required by section 5.3.5 of the HDMI 1.4
- * specification.
  *
  * Returns 0 on success or a negative error code on failure.
  */
-static int hdmi_drm_infoframe_unpack(struct hdmi_drm_infoframe *frame,
-				     const void *buffer, size_t size)
+int hdmi_drm_infoframe_unpack_only(struct hdmi_drm_infoframe *frame,
+				   const void *buffer, size_t size)
 {
 	const u8 *ptr = buffer;
 	const u8 *temp;
@@ -1797,23 +1795,13 @@  static int hdmi_drm_infoframe_unpack(struct hdmi_drm_infoframe *frame,
 	int ret;
 	int i;
 
-	if (size < HDMI_INFOFRAME_SIZE(DRM))
-		return -EINVAL;
-
-	if (ptr[0] != HDMI_INFOFRAME_TYPE_DRM ||
-	    ptr[1] != 1 ||
-	    ptr[2] != HDMI_DRM_INFOFRAME_SIZE)
-		return -EINVAL;
-
-	if (hdmi_infoframe_checksum(buffer, HDMI_INFOFRAME_SIZE(DRM)) != 0)
+	if (size < HDMI_DRM_INFOFRAME_SIZE)
 		return -EINVAL;
 
 	ret = hdmi_drm_infoframe_init(frame);
 	if (ret)
 		return ret;
 
-	ptr += HDMI_INFOFRAME_HEADER_SIZE;
-
 	frame->eotf = ptr[0] & 0x7;
 	frame->metadata_type = ptr[1] & 0x7;
 
@@ -1837,6 +1825,42 @@  static int hdmi_drm_infoframe_unpack(struct hdmi_drm_infoframe *frame,
 
 	return 0;
 }
+EXPORT_SYMBOL(hdmi_drm_infoframe_unpack_only);
+
+/**
+ * hdmi_drm_infoframe_unpack() - unpack binary buffer to a HDMI DRM infoframe
+ * @frame: HDMI DRM infoframe
+ * @buffer: source buffer
+ * @size: size of buffer
+ *
+ * Unpacks the information contained in binary @buffer into a structured
+ * @frame of the HDMI Dynamic Range and Mastering (DRM) information frame.
+ * Also verifies the checksum as required by section 5.3.5 of the HDMI 1.4
+ * specification.
+ *
+ * Returns 0 on success or a negative error code on failure.
+ */
+static int hdmi_drm_infoframe_unpack(struct hdmi_drm_infoframe *frame,
+				     const void *buffer, size_t size)
+{
+	const u8 *ptr = buffer;
+	int ret;
+
+	if (size < HDMI_INFOFRAME_SIZE(DRM))
+		return -EINVAL;
+
+	if (ptr[0] != HDMI_INFOFRAME_TYPE_DRM ||
+	    ptr[1] != 1 ||
+	    ptr[2] != HDMI_DRM_INFOFRAME_SIZE)
+		return -EINVAL;
+
+	if (hdmi_infoframe_checksum(buffer, HDMI_INFOFRAME_SIZE(DRM)) != 0)
+		return -EINVAL;
+
+	ret = hdmi_drm_infoframe_unpack_only(frame, ptr + HDMI_INFOFRAME_HEADER_SIZE,
+					     size - HDMI_INFOFRAME_HEADER_SIZE);
+	return ret;
+}
 
 /**
  * hdmi_infoframe_unpack() - unpack binary buffer to a HDMI infoframe
diff --git a/include/linux/hdmi.h b/include/linux/hdmi.h
index 9918a6c910c5..afb43efc03e0 100644
--- a/include/linux/hdmi.h
+++ b/include/linux/hdmi.h
@@ -219,6 +219,8 @@  ssize_t hdmi_drm_infoframe_pack(struct hdmi_drm_infoframe *frame, void *buffer,
 ssize_t hdmi_drm_infoframe_pack_only(const struct hdmi_drm_infoframe *frame,
 				     void *buffer, size_t size);
 int hdmi_drm_infoframe_check(struct hdmi_drm_infoframe *frame);
+int hdmi_drm_infoframe_unpack_only(struct hdmi_drm_infoframe *frame,
+				   const void *buffer, size_t size);
 
 enum hdmi_spd_sdi {
 	HDMI_SPD_SDI_UNKNOWN,