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drm/edid: Parse and handle HDMI deep color modes. 

Check the HDMI cea block for deep color mode bits. If available,
assign the highest supported bpc for a hdmi display, corresponding
to the given deep color modes.

Signed-off-by: Mario Kleiner <mario.kleiner.de@gmail.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Mario Kleiner 2014-03-27 19:59:39 +01:00 committed by Alex Deucher
parent 89b92339c1
commit d0c94692e0
2 changed files with 113 additions and 2 deletions
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110
drivers/gpu/drm/drm_edid.c
View File

@ -3422,17 +3422,117 @@ bool drm_rgb_quant_range_selectable(struct edid *edid)
}
EXPORT_SYMBOL(drm_rgb_quant_range_selectable);
/**
* drm_assign_hdmi_deep_color_info - detect whether monitor supports
* hdmi deep color modes and update drm_display_info if so.
*
* @edid: monitor EDID information
* @info: Updated with maximum supported deep color bpc and color format
* if deep color supported.
*
* Parse the CEA extension according to CEA-861-B.
* Return true if HDMI deep color supported, false if not or unknown.
*/
static bool drm_assign_hdmi_deep_color_info(struct edid *edid,
struct drm_display_info *info,
struct drm_connector *connector)
{
u8 *edid_ext, *hdmi;
int i;
int start_offset, end_offset;
unsigned int dc_bpc = 0;
edid_ext = drm_find_cea_extension(edid);
if (!edid_ext)
return false;
if (cea_db_offsets(edid_ext, &start_offset, &end_offset))
return false;
/*
* Because HDMI identifier is in Vendor Specific Block,
* search it from all data blocks of CEA extension.
*/
for_each_cea_db(edid_ext, i, start_offset, end_offset) {
if (cea_db_is_hdmi_vsdb(&edid_ext[i])) {
/* HDMI supports at least 8 bpc */
info->bpc = 8;
hdmi = &edid_ext[i];
if (cea_db_payload_len(hdmi) < 6)
return false;
if (hdmi[6] & DRM_EDID_HDMI_DC_30) {
dc_bpc = 10;
DRM_DEBUG("%s: HDMI sink does deep color 30.\n",
drm_get_connector_name(connector));
}
if (hdmi[6] & DRM_EDID_HDMI_DC_36) {
dc_bpc = 12;
DRM_DEBUG("%s: HDMI sink does deep color 36.\n",
drm_get_connector_name(connector));
}
if (hdmi[6] & DRM_EDID_HDMI_DC_48) {
dc_bpc = 16;
DRM_DEBUG("%s: HDMI sink does deep color 48.\n",
drm_get_connector_name(connector));
}
if (dc_bpc > 0) {
DRM_DEBUG("%s: Assigning HDMI sink color depth as %d bpc.\n",
drm_get_connector_name(connector), dc_bpc);
info->bpc = dc_bpc;
/*
* Deep color support mandates RGB444 support for all video
* modes and forbids YCRCB422 support for all video modes per
* HDMI 1.3 spec.
*/
info->color_formats = DRM_COLOR_FORMAT_RGB444;
/* YCRCB444 is optional according to spec. */
if (hdmi[6] & DRM_EDID_HDMI_DC_Y444) {
info->color_formats |= DRM_COLOR_FORMAT_YCRCB444;
DRM_DEBUG("%s: HDMI sink does YCRCB444 in deep color.\n",
drm_get_connector_name(connector));
}
/*
* Spec says that if any deep color mode is supported at all,
* then deep color 36 bit must be supported.
*/
if (!(hdmi[6] & DRM_EDID_HDMI_DC_36)) {
DRM_DEBUG("%s: HDMI sink should do DC_36, but does not!\n",
drm_get_connector_name(connector));
}
return true;
}
else {
DRM_DEBUG("%s: No deep color support on this HDMI sink.\n",
drm_get_connector_name(connector));
}
}
}
return false;
}
/**
* drm_add_display_info - pull display info out if present
* @edid: EDID data
* @info: display info (attached to connector)
* @connector: connector whose edid is used to build display info
*
* Grab any available display info and stuff it into the drm_display_info
* structure that's part of the connector. Useful for tracking bpp and
* color spaces.
*/
static void drm_add_display_info(struct edid *edid,
struct drm_display_info *info)
struct drm_display_info *info,
struct drm_connector *connector)
{
u8 *edid_ext;
@ -3462,6 +3562,9 @@ static void drm_add_display_info(struct edid *edid,
info->color_formats |= DRM_COLOR_FORMAT_YCRCB422;
}
/* HDMI deep color modes supported? Assign to info, if so */
drm_assign_hdmi_deep_color_info(edid, info, connector);
/* Only defined for 1.4 with digital displays */
if (edid->revision < 4)
return;
@ -3491,6 +3594,9 @@ static void drm_add_display_info(struct edid *edid,
break;
}
DRM_DEBUG("%s: Assigning EDID-1.4 digital sink color depth as %d bpc.\n",
drm_get_connector_name(connector), info->bpc);
info->color_formats |= DRM_COLOR_FORMAT_RGB444;
if (edid->features & DRM_EDID_FEATURE_RGB_YCRCB444)
info->color_formats |= DRM_COLOR_FORMAT_YCRCB444;
@ -3549,7 +3655,7 @@ int drm_add_edid_modes(struct drm_connector *connector, struct edid *edid)
if (quirks & (EDID_QUIRK_PREFER_LARGE_60 | EDID_QUIRK_PREFER_LARGE_75))
edid_fixup_preferred(connector, quirks);
drm_add_display_info(edid, &connector->display_info);
drm_add_display_info(edid, &connector->display_info, connector);
if (quirks & EDID_QUIRK_FORCE_8BPC)
connector->display_info.bpc = 8;

5
include/drm/drm_edid.h
View File

@ -202,6 +202,11 @@ struct detailed_timing {
#define DRM_EDID_FEATURE_PM_SUSPEND (1 << 6)
#define DRM_EDID_FEATURE_PM_STANDBY (1 << 7)
#define DRM_EDID_HDMI_DC_48 (1 << 6)
#define DRM_EDID_HDMI_DC_36 (1 << 5)
#define DRM_EDID_HDMI_DC_30 (1 << 4)
#define DRM_EDID_HDMI_DC_Y444 (1 << 3)
struct edid {
u8 header[8];
/* Vendor & product info */