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path: root/drivers/gpu/drm/drm_edid.c
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Diffstat (limited to 'drivers/gpu/drm/drm_edid.c')
-rw-r--r--drivers/gpu/drm/drm_edid.c185
1 files changed, 88 insertions, 97 deletions
diff --git a/drivers/gpu/drm/drm_edid.c b/drivers/gpu/drm/drm_edid.c
index caa84a056779..ef8ae691f7aa 100644
--- a/drivers/gpu/drm/drm_edid.c
+++ b/drivers/gpu/drm/drm_edid.c
@@ -3733,105 +3733,110 @@ bool drm_rgb_quant_range_selectable(struct edid *edid)
}
EXPORT_SYMBOL(drm_rgb_quant_range_selectable);
-/*
- * 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_connector *connector)
+static void drm_parse_hdmi_deep_color_info(struct drm_connector *connector,
+ const u8 *hdmi)
{
struct drm_display_info *info = &connector->display_info;
- 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;
+ /* HDMI supports at least 8 bpc */
+ info->bpc = 8;
- if (cea_db_offsets(edid_ext, &start_offset, &end_offset))
- return false;
+ if (cea_db_payload_len(hdmi) < 6)
+ return;
+
+ if (hdmi[6] & DRM_EDID_HDMI_DC_30) {
+ dc_bpc = 10;
+ info->edid_hdmi_dc_modes |= DRM_EDID_HDMI_DC_30;
+ DRM_DEBUG("%s: HDMI sink does deep color 30.\n",
+ connector->name);
+ }
+
+ if (hdmi[6] & DRM_EDID_HDMI_DC_36) {
+ dc_bpc = 12;
+ info->edid_hdmi_dc_modes |= DRM_EDID_HDMI_DC_36;
+ DRM_DEBUG("%s: HDMI sink does deep color 36.\n",
+ connector->name);
+ }
+
+ if (hdmi[6] & DRM_EDID_HDMI_DC_48) {
+ dc_bpc = 16;
+ info->edid_hdmi_dc_modes |= DRM_EDID_HDMI_DC_48;
+ DRM_DEBUG("%s: HDMI sink does deep color 48.\n",
+ connector->name);
+ }
+
+ if (dc_bpc == 0) {
+ DRM_DEBUG("%s: No deep color support on this HDMI sink.\n",
+ connector->name);
+ return;
+ }
+
+ DRM_DEBUG("%s: Assigning HDMI sink color depth as %d bpc.\n",
+ connector->name, dc_bpc);
+ info->bpc = dc_bpc;
/*
- * Because HDMI identifier is in Vendor Specific Block,
- * search it from all data blocks of CEA extension.
+ * Deep color support mandates RGB444 support for all video
+ * modes and forbids YCRCB422 support for all video modes per
+ * HDMI 1.3 spec.
*/
- 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;
- info->edid_hdmi_dc_modes |= DRM_EDID_HDMI_DC_30;
- DRM_DEBUG("%s: HDMI sink does deep color 30.\n",
- connector->name);
- }
+ info->color_formats = DRM_COLOR_FORMAT_RGB444;
- if (hdmi[6] & DRM_EDID_HDMI_DC_36) {
- dc_bpc = 12;
- info->edid_hdmi_dc_modes |= DRM_EDID_HDMI_DC_36;
- DRM_DEBUG("%s: HDMI sink does deep color 36.\n",
- connector->name);
- }
+ /* 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",
+ connector->name);
+ }
- if (hdmi[6] & DRM_EDID_HDMI_DC_48) {
- dc_bpc = 16;
- info->edid_hdmi_dc_modes |= DRM_EDID_HDMI_DC_48;
- DRM_DEBUG("%s: HDMI sink does deep color 48.\n",
- connector->name);
- }
+ /*
+ * 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",
+ connector->name);
+ }
+}
- if (dc_bpc > 0) {
- DRM_DEBUG("%s: Assigning HDMI sink color depth as %d bpc.\n",
- connector->name, 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",
- connector->name);
- }
+static void drm_parse_cea_ext(struct drm_connector *connector,
+ struct edid *edid)
+{
+ struct drm_display_info *info = &connector->display_info;
+ const u8 *edid_ext;
+ int i, start, end;
- /*
- * 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",
- connector->name);
- }
+ edid_ext = drm_find_cea_extension(edid);
+ if (!edid_ext)
+ return;
- return true;
- }
- else {
- DRM_DEBUG("%s: No deep color support on this HDMI sink.\n",
- connector->name);
- }
- }
- }
+ info->cea_rev = edid_ext[1];
- return false;
+ /* 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;
+
+ if (cea_db_offsets(edid_ext, &start, &end))
+ return;
+
+ for_each_cea_db(edid_ext, i, start, end) {
+ const u8 *db = &edid_ext[i];
+
+ if (!cea_db_is_hdmi_vsdb(db))
+ continue;
+
+ drm_parse_hdmi_deep_color_info(connector, db);
+ }
}
-static void drm_add_display_info(struct edid *edid,
- struct drm_connector *connector)
+static void drm_add_display_info(struct drm_connector *connector,
+ struct edid *edid)
{
struct drm_display_info *info = &connector->display_info;
- u8 *edid_ext;
info->width_mm = edid->width_cm * 10;
info->height_mm = edid->height_cm * 10;
@@ -3846,21 +3851,7 @@ static void drm_add_display_info(struct edid *edid,
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;
- }
-
- /* HDMI deep color modes supported? Assign to info, if so */
- drm_assign_hdmi_deep_color_info(edid, connector);
+ drm_parse_cea_ext(connector, edid);
/*
* Digital sink with "DFP 1.x compliant TMDS" according to EDID 1.3?
@@ -4096,7 +4087,7 @@ 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);
+ drm_add_display_info(connector, edid);
if (quirks & EDID_QUIRK_FORCE_6BPC)
connector->display_info.bpc = 6;
generated by cgit v1.2.3 (git 2.39.0) at 2025-01-23 17:08:27 +0300