HDMI 2.0 / CEA-861-F specs define a new CEA extension data block,
called hdmi-forum vendor specific data block (HF-VSDB). This block
contains information about sink's support for HDMI 2.0 compliant
features. These features are:
- Deep color YUV 420 support and BPC
- 3D flags for
- OSD Displarity
- Dual view signaling
- independent view signaling
- SCDC support
- Max TMDS char rate
- Scrambling support
This patch adds a parser function for this block, and add flags to
indicate support for new features, in drm_display_info structure.
Signed-off-by: Shashank Sharma <shashank.sharma@xxxxxxxxx>
---
drivers/gpu/drm/drm_edid.c | 73 +++++++++++++++++++++++++++++++++++++++++++++
include/drm/drm_connector.h | 48 +++++++++++++++++++++++++++++
include/drm/drm_edid.h | 5 ++++
include/linux/hdmi.h | 1 +
4 files changed, 127 insertions(+)
diff --git a/drivers/gpu/drm/drm_edid.c b/drivers/gpu/drm/drm_edid.c
index 336be31..b18bfe0 100644
--- a/drivers/gpu/drm/drm_edid.c
+++ b/drivers/gpu/drm/drm_edid.c
@@ -3223,6 +3223,27 @@ static int add_3d_struct_modes(struct drm_connector *connector, u16 structure,
return 0;
}
+static bool cea_db_is_hf_vsdb(const u8 *db)
+{
+ u8 len;
+ int hfvsdb_id;
+
+ if (cea_db_tag(db) != VENDOR_BLOCK)
+ return false;
+
+ len = cea_db_payload_len(db);
+ if (len < 7 || len > 31)
+ return false;
+
+ /* version should be 1 */
+ if (db[4] != 1)
+ return false;
+
+ hfvsdb_id = db[1] | (db[2] << 8) | (db[3] << 16);
+
+ return hfvsdb_id == HDMI_IEEE_OUI_HFVSDB;
+}
+
static bool cea_db_is_hdmi_vsdb(const u8 *db)
{
int hdmi_id;
@@ -3767,6 +3788,56 @@ bool drm_rgb_quant_range_selectable(struct edid *edid)
}
EXPORT_SYMBOL(drm_rgb_quant_range_selectable);
+static void drm_parse_yuv420_deep_color_info(struct drm_connector *connector,
+ const u8 *db)
+{
+ struct drm_display_info *info = &connector->display_info;
+
+ if (db[7] & DRM_EDID_YUV420_DC_48)
+ info->edid_yuv420_dc_modes |= DRM_EDID_YUV420_DC_48;
+ if (db[7] & DRM_EDID_YUV420_DC_36)
+ info->edid_yuv420_dc_modes |= DRM_EDID_YUV420_DC_36;
+ if (db[7] & DRM_EDID_YUV420_DC_30)
+ info->edid_yuv420_dc_modes |= DRM_EDID_YUV420_DC_30;
+
+ if (!info->edid_yuv420_dc_modes) {
+ DRM_DEBUG("%s: No YUV 420 deep color support in sink.\n",
+ connector->name);
+ return;
+ }
+}
+
+static void
+drm_parse_hf_vsdb(struct drm_connector *connector, const u8 *db)
+{
+ struct drm_display_info *info = &connector->display_info;
+
+ if (db[5]) {
+ /*
+ * If the sink supplies max tmds char rate in db,
+ * the actual max tmds rate = db[5] * 5Mhz.
+ */
+ info->max_tmds_clock = db[5] * 5000;
+ DRM_DEBUG_KMS("HF-VSDB: max TMDS clock %d kHz\n",
+ info->max_tmds_clock);
+ }
+
+ if (db[6] & DRM_HFVSDB_SCDC_SUPPORT)
+ info->scdc_supported = true;
+ if (db[6] & DRM_HFVSDB_SCDC_RR_CAP)
+ info->scdc_rr_cap = true;
+ if (db[6] & DRM_HFVSDB_SCRAMBLING)
+ info->scrambling = true;
+ if (db[6] & DRM_HFVSDB_INDEPENDENT_VIEW)
+ info->independent_view_3d = true;
+ if (db[6] & DRM_HFVSDB_DUAL_VIEW)
+ info->dual_view_3d = true;
+ if (db[6] & DRM_HFVSDB_3D_OSD)
+ info->osd_disparity_3d = true;
+
+ drm_parse_yuv420_deep_color_info(connector, db);
+}
+
static void drm_parse_hdmi_deep_color_info(struct drm_connector *connector,
const u8 *hdmi)
{
@@ -3881,6 +3952,8 @@ static void drm_parse_cea_ext(struct drm_connector *connector,
if (cea_db_is_hdmi_vsdb(db))
drm_parse_hdmi_vsdb_video(connector, db);
+ if (cea_db_is_hf_vsdb(db))
+ drm_parse_hf_vsdb(connector, db);
}
}
diff --git a/include/drm/drm_connector.h b/include/drm/drm_connector.h
index 34f9741..d011dd5 100644
--- a/include/drm/drm_connector.h
+++ b/include/drm/drm_connector.h
@@ -167,6 +167,46 @@ struct drm_display_info {
*/
u32 bus_flags;
+#define DRM_HFVSDB_SCDC_SUPPORT (1<<7)
+#define DRM_HFVSDB_SCDC_RR_CAP (1<<6)
+#define DRM_HFVSDB_SCRAMBLING (1<<3)
+#define DRM_HFVSDB_INDEPENDENT_VIEW (1<<2)
+#define DRM_HFVSDB_DUAL_VIEW (1<<1)
+#define DRM_HFVSDB_3D_OSD (1<<0)
+
+ /**
+ * @scdc_supported: Sink supports SCDC functionality.
+ */
+ bool scdc_supported;
+
+ /**
+ * @scdc_rr_cap: Sink has SCDC read request capability.
+ */
+ bool scdc_rr_cap;
+
+ /**
+ * @scrambling: Sync supports scrambling for <=340 Mcsc TMDS
+ * char rates. Above 340 Mcsc rates, scrambling is always reqd.
+ */
+ bool scrambling;
+
+ /**
+ * @independent_view_3d: Sink supports 3d independent view signaling
+ * in HF-VSIF.
+ */
+ bool independent_view_3d;
+
+ /**
+ * @dual_view_3d: Sink supports 3d dual view signaling in HF-VSIF.
+ */
+ bool dual_view_3d;
+
+ /**
+ * @osd_disparity_3d: Sink supports 3d osd disparity indication
+ * in HF-VSIF.
+ */
+ bool osd_disparity_3d;
+
/**
* @max_tmds_clock: Maximum TMDS clock rate supported by the
* sink in kHz. 0 means undefined.
@@ -185,6 +225,14 @@ struct drm_display_info {
u8 edid_hdmi_dc_modes;
/**
+ * @edid_yuv420_dc_modes: bpc for deep color yuv420 encoding.
+ * various sinks can support 10/12/16 bit per channel deep
+ * color encoding. edid_yuv420_dc_modes = 0 means sink doesn't
+ * support deep color yuv420 encoding.
+ */
+ u8 edid_yuv420_dc_modes;
+
+ /**
* @cea_rev: CEA revision of the HDMI sink.
*/
u8 cea_rev;
diff --git a/include/drm/drm_edid.h b/include/drm/drm_edid.h
index 38eabf6..5df8b9c 100644
--- a/include/drm/drm_edid.h
+++ b/include/drm/drm_edid.h
@@ -212,6 +212,11 @@ struct detailed_timing {
#define DRM_EDID_HDMI_DC_30 (1 << 4)
#define DRM_EDID_HDMI_DC_Y444 (1 << 3)
+/* YUV 420 deep color modes */
+#define DRM_EDID_YUV420_DC_48 (1 << 6)
+#define DRM_EDID_YUV420_DC_36 (1 << 5)
+#define DRM_EDID_YUV420_DC_30 (1 << 5)
+
/* ELD Header Block */
#define DRM_ELD_HEADER_BLOCK_SIZE 4
diff --git a/include/linux/hdmi.h b/include/linux/hdmi.h
index edbb4fc..2d4e9ef 100644
--- a/include/linux/hdmi.h
+++ b/include/linux/hdmi.h
@@ -35,6 +35,7 @@ enum hdmi_infoframe_type {
};
#define HDMI_IEEE_OUI 0x000c03
+#define HDMI_IEEE_OUI_HFVSDB 0xC45DD8
#define HDMI_INFOFRAME_HEADER_SIZE 4
#define HDMI_AVI_INFOFRAME_SIZE 13
#define HDMI_SPD_INFOFRAME_SIZE 25
--
1.9.1
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