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video/hdmi: Add Unpack function for DRM infoframe

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Added unpack function for DRM infoframe for dynamic
range and mastering infoframe readout.

v2: Addressed Ville's review comments.

Suggested-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Uma Shankar <uma.shankar@intel.com>
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/1558015817-12025-12-git-send-email-uma.shankar@intel.com
This commit is contained in:
Uma Shankar 2019-05-16 19:40:16 +05:30 committed by Ville Syrjälä
parent b5e3eed1ee
commit 270afb37ae
1 changed files with 67 additions and 0 deletions
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67
drivers/video/hdmi.c
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@ -1804,6 +1804,70 @@ hdmi_vendor_any_infoframe_unpack(union hdmi_vendor_any_infoframe *frame,
return 0;
}
/**
* 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;
const u8 *temp;
u8 x_lsb, x_msb;
u8 y_lsb, y_msb;
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)
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;
temp = ptr + 2;
for (i = 0; i < 3; i++) {
x_lsb = *temp++;
x_msb = *temp++;
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;
}
frame->white_point.x = (ptr[15] << 8) | ptr[14];
frame->white_point.y = (ptr[17] << 8) | ptr[16];
frame->max_display_mastering_luminance = (ptr[19] << 8) | ptr[18];
frame->min_display_mastering_luminance = (ptr[21] << 8) | ptr[20];
frame->max_cll = (ptr[23] << 8) | ptr[22];
frame->max_fall = (ptr[25] << 8) | ptr[24];
return 0;
}
/**
* hdmi_infoframe_unpack() - unpack binary buffer to a HDMI infoframe
* @frame: HDMI infoframe
@ -1830,6 +1894,9 @@ int hdmi_infoframe_unpack(union hdmi_infoframe *frame,
case HDMI_INFOFRAME_TYPE_AVI:
ret = hdmi_avi_infoframe_unpack(&frame->avi, buffer, size);
break;
case HDMI_INFOFRAME_TYPE_DRM:
ret = hdmi_drm_infoframe_unpack(&frame->drm, buffer, size);
break;
case HDMI_INFOFRAME_TYPE_SPD:
ret = hdmi_spd_infoframe_unpack(&frame->spd, buffer, size);
break;