drm/edid: Fix minimum bpc supported with DSC1.2 for HDMI sink

[ Upstream commit 18feaf6d0784dcba888859109676adf1e0260dfd ]

HF-VSDB/SCDB has bits to advertise support for 16, 12 and 10 bpc.
If none of the bits are set, the minimum bpc supported with DSC is 8.

This patch corrects the min bpc supported to be 8, instead of 0.

Fixes: 76ee7b905678 ("drm/edid: Parse DSC1.2 cap fields from HFVSDB block")
Cc: Ankit Nautiyal <ankit.k.nautiyal@intel.com>
Cc: Uma Shankar <uma.shankar@intel.com>
Cc: Jani Nikula <jani.nikula@intel.com>
Cc: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
v2: s/DSC1.2/DSC 1.2

Signed-off-by: Ankit Nautiyal <ankit.k.nautiyal@intel.com>
Reviewed-by: Jani Nikula <jani.nikula@intel.com>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220916100551.2531750-2-ankit.k.nautiyal@intel.com
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/gpu/drm/drm_edid.c b/drivers/gpu/drm/drm_edid.c
index 6ab048ba8021ca8c68ea42a4b7ceeea6421cb931..d940c76419c5ab0b28f6195ac55ef8f238aab2f4 100644 (file)
--- a/drivers/gpu/drm/drm_edid.c
+++ b/drivers/gpu/drm/drm_edid.c
@@ -4942,7 +4942,8 @@ static void drm_parse_hdmi_forum_vsdb(struct drm_connector *connector,
                        else if (hf_vsdb[11] & DRM_EDID_DSC_10BPC)
                                hdmi_dsc->bpc_supported = 10;
                        else
-                               hdmi_dsc->bpc_supported = 0;
+                               /* Supports min 8 BPC if DSC 1.2 is supported*/
+                               hdmi_dsc->bpc_supported = 8;
 
                        dsc_max_frl_rate = (hf_vsdb[12] & DRM_EDID_DSC_MAX_FRL_RATE_MASK) >> 4;
                        drm_get_max_frl_rate(dsc_max_frl_rate, &hdmi_dsc->max_lanes,