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 b36abfa..9d82de4 100644 (file)
--- a/drivers/gpu/drm/drm_edid.c
+++ b/drivers/gpu/drm/drm_edid.c
@@ -5827,7 +5827,8 @@ static void drm_parse_hdmi_forum_scds(struct drm_connector *connector,
                        else if (hf_scds[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_scds[12] & DRM_EDID_DSC_MAX_FRL_RATE_MASK) >> 4;
                        drm_get_max_frl_rate(dsc_max_frl_rate, &hdmi_dsc->max_lanes,