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drm/i915/dp: Return min bpc supported by source instead of 0

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Currently, intel_dp_dsc_max_src_input_bpc can return 0 for platforms not
supporting DSC, which could theoretically cause issues in clamp()
due to a low limit being greater than the high limit.

Instead, return the minimum bpc supported by the source to prevent
such issues.

Reported-by: Linux Kernel Functional Testing <lkft@linaro.org>
Closes: https://lore.kernel.org/all/CA+G9fYtNfM399_=_ff81zeRJv=0+z7oFJfPGmJgTp6yrJmU+1w@mail.gmail.com/
Fixes: 160672b86b ("drm/i915/dp: Use clamp for pipe_bpp limits with DSC")
Cc: Suraj Kandpal <suraj.kandpal@intel.com>
Cc: Jani Nikula <jani.nikula@linux.intel.com>
Cc: Rodrigo Vivi <rodrigo.vivi@intel.com>
Signed-off-by: Ankit Nautiyal <ankit.k.nautiyal@intel.com>
Reviewed-by: Suraj Kandpal <suraj.kandpal@intel.com>
Tested-by: Chaitanya Kumar Borah <chaitanya.kumar.borah@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20250131041342.3086716-1-ankit.k.nautiyal@intel.com
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
This commit is contained in:
Ankit Nautiyal 2025-01-31 09:43:42 +05:30 • committed by Rodrigo Vivi
parent 31c7265628
commit a67221b5eb
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GPG key ID: FA625F640EEB13CA
1 changed files with 1 additions and 1 deletions
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2
drivers/gpu/drm/i915/display/intel_dp.c
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@ -1791,7 +1791,7 @@ int intel_dp_dsc_max_src_input_bpc(struct intel_display *display)
if (DISPLAY_VER(display) == 11)
return 10;
return 0;
return intel_dp_dsc_min_src_input_bpc();
}
int intel_dp_dsc_compute_max_bpp(const struct intel_connector *connector,