[Intel-gfx] [RFC 09/13] drm/edid: Parse DSC1.2 cap fields from HFVSDB block

[Ankit Nautiyal]

This patch parses HFVSDB fields for DSC1.2 capabilities of an
HDMI2.1 sink. These fields are required by a source to understand the
DSC capability of the sink, to set appropriate PPS parameters,
before transmitting compressed data stream.

Signed-off-by: Ankit Nautiyal <ankit.k.nautiyal at intel.com>
---
 drivers/gpu/drm/drm_edid.c  | 19 +++++++++++++++++++
 include/drm/drm_connector.h | 32 ++++++++++++++++++++++++++++++++
 2 files changed, 51 insertions(+)

diff --git a/drivers/gpu/drm/drm_edid.c b/drivers/gpu/drm/drm_edid.c
index 8afb136e73f5..feee19657a7a 100644
--- a/drivers/gpu/drm/drm_edid.c
+++ b/drivers/gpu/drm/drm_edid.c
@@ -4889,10 +4889,29 @@ static void drm_parse_hdmi_21_additional_fields(struct drm_connector *connector,
 {
 	struct drm_hdmi_info *hdmi = &connector->display_info.hdmi;
 	u8 max_frl_rate;
+	u8 dsc_max_frl_rate;
 
 	max_frl_rate = db[7] & DRM_EDID_MAX_FRL_RATE_MASK;
 	drm_get_max_frl_rate(max_frl_rate, &hdmi->max_lanes,
 			     &hdmi->max_frl_rate_per_lane);
+
+	hdmi->dsc_1p2 = db[11] & DRM_EDID_DSC_1P2;
+        hdmi->dsc_native_420 = db[11] & DRM_EDID_DSC_NATIVE_420;
+	hdmi->dsc_all_bpp = db[11] & DRM_EDID_DSC_ALL_BPP;
+
+	if (db[11] & DRM_EDID_DSC_16BPC)
+		hdmi->dsc_bpc_supported = 16;
+	else if (db[11] & DRM_EDID_DSC_12BPC)
+		hdmi->dsc_bpc_supported = 12;
+	else if (db[11] & DRM_EDID_DSC_10BPC)
+		hdmi->dsc_bpc_supported = 10;
+	else
+		hdmi->dsc_bpc_supported = 0;
+
+	dsc_max_frl_rate = db[12] & DRM_EDID_DSC_MAX_FRL_RATE;
+	drm_get_max_frl_rate(dsc_max_frl_rate, &hdmi->dsc_max_lanes,
+			     &hdmi->dsc_max_frl_rate_per_lane);
+	hdmi->dsc_total_chunk_kbytes = db[13] & DRM_EDID_DSC_TOTAL_CHUNK_KBYTES;
 }
 
 static void drm_parse_ycbcr420_deep_color_info(struct drm_connector *connector,
diff --git a/include/drm/drm_connector.h b/include/drm/drm_connector.h
index f351bf10c076..7100012f9c0f 100644
--- a/include/drm/drm_connector.h
+++ b/include/drm/drm_connector.h
@@ -213,6 +213,38 @@ struct drm_hdmi_info {
 
 	/** @max_lanes: supported by sink */
 	u8 max_lanes;
+
+	/** @dsc_1p2: flag for dsc1.2 support by sink */
+	bool dsc_1p2;
+
+	/** @dsc_native_420: Does sink support DSC with 4:2:0 compression */
+	bool dsc_native_420;
+
+	/**
+	 * @dsc_all_bpp: Does sink support all bpp with 4:4:4: or 4:2:2
+	 * compressed formats
+	 */
+	bool dsc_all_bpp;
+
+	/**
+	 * @dsc_bpc_supported: compressed bpc supported by sink : 10, 12 or 16 bpc
+	 */
+	u8 dsc_bpc_supported;
+
+	/** @dsc_max_slices: maximum number of Horizontal slices supported by */
+	u8 dsc_max_slices;
+
+	/** @dsc_clk_per_slice : max pixel clock in MHz supported per slice */
+	u8 dsc_clk_per_slice;
+
+	/** @dsc_max_lanes : dsc max lanes supported for Fixed rate Link training */
+	u8 dsc_max_lanes;
+
+	/** @dsc_max_frl_rate_per_lane : maximum frl rate with DSC per lane */
+	u8 dsc_max_frl_rate_per_lane;
+
+	/** @dsc_total_chunk_kbytes: max size of chunks in KBs supported per line*/
+	u8 dsc_total_chunk_kbytes;
 };
 
 /**
-- 
2.17.1