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drm/display/dp: Assume 8 bpc support when DSC is supported

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As per DP v1.4, a DP DSC Sink device shall support 8bpc in DPCD 6Ah.
Apparently some panels that do support DSC, are not setting the bit for
8bpc.

So always assume 8bpc support by DSC decoder, when DSC is claimed to be
supported.

v2: Use helper to get check dsc support. (Ankit)
v3: Fix styling and other typos. (Jani)

Signed-off-by: Ankit Nautiyal <ankit.k.nautiyal@intel.com>
Acked-by: Maxime Ripard <mripard@kernel.org>
Reviewed-by: Stanislav Lisovskiy <stanislav.lisovskiy@intel.com>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20230824125121.840298-2-ankit.k.nautiyal@intel.com
This commit is contained in:
Ankit Nautiyal 2023-08-24 18:21:20 +05:30 committed by Jani Nikula
parent b3bca7b8fa
commit 10eaac085b
1 changed files with 6 additions and 2 deletions
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8
drivers/gpu/drm/display/drm_dp_helper.c
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@ -2449,12 +2449,16 @@ int drm_dp_dsc_sink_supported_input_bpcs(const u8 dsc_dpcd[DP_DSC_RECEIVER_CAP_S
int num_bpc = 0;
u8 color_depth = dsc_dpcd[DP_DSC_DEC_COLOR_DEPTH_CAP - DP_DSC_SUPPORT];
if (!drm_dp_sink_supports_dsc(dsc_dpcd))
return 0;
if (color_depth & DP_DSC_12_BPC)
dsc_bpc[num_bpc++] = 12;
if (color_depth & DP_DSC_10_BPC)
dsc_bpc[num_bpc++] = 10;
if (color_depth & DP_DSC_8_BPC)
dsc_bpc[num_bpc++] = 8;
/* A DP DSC Sink device shall support 8 bpc. */
dsc_bpc[num_bpc++] = 8;
return num_bpc;
}