This is a note to let you know that I've just added the patch titled
drm/edid: Fix minimum bpc supported with DSC1.2 for HDMI sink
to the 6.1-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
drm-edid-fix-minimum-bpc-supported-with-dsc1.2-for-h.patch
and it can be found in the queue-6.1 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 2a378018749c5e96afc0551454826afc6e7fc9a0
Author: Ankit Nautiyal <ankit.k.nautiyal@xxxxxxxxx>
Date: Fri Sep 16 15:35:48 2022 +0530
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@xxxxxxxxx>
Cc: Uma Shankar <uma.shankar@xxxxxxxxx>
Cc: Jani Nikula <jani.nikula@xxxxxxxxx>
Cc: Maarten Lankhorst <maarten.lankhorst@xxxxxxxxxxxxxxx>
v2: s/DSC1.2/DSC 1.2
Signed-off-by: Ankit Nautiyal <ankit.k.nautiyal@xxxxxxxxx>
Reviewed-by: Jani Nikula <jani.nikula@xxxxxxxxx>
Signed-off-by: Jani Nikula <jani.nikula@xxxxxxxxx>
Link: https://patchwork.freedesktop.org/patch/msgid/20220916100551.2531750-2-ankit.k.nautiyal@xxxxxxxxx
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/gpu/drm/drm_edid.c b/drivers/gpu/drm/drm_edid.c
index b36abfa915813..9d82de4c0a8b0 100644
--- 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,
