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video/hdmi: Add Unpack only function for DRM infoframe

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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.

v9: Add clear comments to hdmi_drm_infoframe_unpack_only() and
    hdmi_drm_infoframe_unpack() (Laurent Pinchart)

Signed-off-by: Gwan-gyeong Mun <gwan-gyeong.mun@intel.com>
Reviewed-by: Uma Shankar <uma.shankar@intel.com>
Cc: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Cc: Ville Syrjala <ville.syrjala@linux.intel.com>
Acked-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20200514060732.3378396-2-gwan-gyeong.mun@intel.com
This commit is contained in:
Gwan-gyeong Mun 2020-05-14 09:07:19 +03:00 committed by Jani Nikula
parent 0f4013fb28
commit f45ce9336f
2 changed files with 48 additions and 19 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

65
drivers/video/hdmi.c
View File

@ -1768,20 +1768,21 @@ 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 of CTA-861-G DRM
* infoframe DataBytes 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.
* Unpacks CTA-861-G DRM infoframe DataBytes contained in the binary @buffer
* into a structured @frame of the HDMI Dynamic Range and Mastering (DRM)
* infoframe.
*
* 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;
@ -1790,23 +1791,13 @@ 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;
@ -1814,7 +1805,7 @@ static int hdmi_drm_infoframe_unpack(struct hdmi_drm_infoframe *frame,
for (i = 0; i < 3; i++) {
x_lsb = *temp++;
x_msb = *temp++;
frame->display_primaries[i].x = (x_msb << 8) | x_lsb;
frame->display_primaries[i].x = (x_msb << 8) | x_lsb;
y_lsb = *temp++;
y_msb = *temp++;
frame->display_primaries[i].y = (y_msb << 8) | y_lsb;
@ -1830,6 +1821,42 @@ 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 CTA-861-G DRM infoframe contained in the binary @buffer into
* a structured @frame of the HDMI Dynamic Range and Mastering (DRM)
* infoframe. It 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

2
include/linux/hdmi.h
View File

@ -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,