Commit a988bc72 authored by Lars-Peter Clausen's avatar Lars-Peter Clausen Committed by Dave Airlie

drm: Parse color format information in CEA blocks

The CEA extension block has a field which describes which YCbCr modes are
supported by the device, use it to fill the drm_display_info color_formats
fields. Also the existence of a CEA extension block is used as indication
that the device supports RGB.
Signed-off-by: default avatarLars-Peter Clausen <lars@metafoo.de>
Reviewed-by: default avatarJesse Barnes <jbarnes@virtuousgeek.org>
Signed-off-by: default avatarDave Airlie <airlied@redhat.com>
parent ee58808d
......@@ -1312,6 +1312,8 @@ add_detailed_modes(struct drm_connector *connector, struct edid *edid,
#define VENDOR_BLOCK 0x03
#define SPEAKER_BLOCK 0x04
#define EDID_BASIC_AUDIO (1 << 6)
#define EDID_CEA_YCRCB444 (1 << 5)
#define EDID_CEA_YCRCB422 (1 << 4)
/**
* Search EDID for CEA extension block.
......@@ -1666,13 +1668,29 @@ static void drm_add_display_info(struct edid *edid,
info->bpc = 0;
info->color_formats = 0;
/* Only defined for 1.4 with digital displays */
if (edid->revision < 4)
if (edid->revision < 3)
return;
if (!(edid->input & DRM_EDID_INPUT_DIGITAL))
return;
/* Get data from CEA blocks if present */
edid_ext = drm_find_cea_extension(edid);
if (edid_ext) {
info->cea_rev = edid_ext[1];
/* The existence of a CEA block should imply RGB support */
info->color_formats = DRM_COLOR_FORMAT_RGB444;
if (edid_ext[3] & EDID_CEA_YCRCB444)
info->color_formats |= DRM_COLOR_FORMAT_YCRCB444;
if (edid_ext[3] & EDID_CEA_YCRCB422)
info->color_formats |= DRM_COLOR_FORMAT_YCRCB422;
}
/* Only defined for 1.4 with digital displays */
if (edid->revision < 4)
return;
switch (edid->input & DRM_EDID_DIGITAL_DEPTH_MASK) {
case DRM_EDID_DIGITAL_DEPTH_6:
info->bpc = 6;
......@@ -1698,18 +1716,11 @@ static void drm_add_display_info(struct edid *edid,
break;
}
info->color_formats = DRM_COLOR_FORMAT_RGB444;
info->color_formats |= DRM_COLOR_FORMAT_RGB444;
if (edid->features & DRM_EDID_FEATURE_RGB_YCRCB444)
info->color_formats |= DRM_COLOR_FORMAT_YCRCB444;
if (edid->features & DRM_EDID_FEATURE_RGB_YCRCB422)
info->color_formats |= DRM_COLOR_FORMAT_YCRCB422;
/* Get data from CEA blocks if present */
edid_ext = drm_find_cea_extension(edid);
if (!edid_ext)
return;
info->cea_rev = edid_ext[1];
}
/**
......
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