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drm/i915/dp: Fix potential infinite loop in 128b/132b SST

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Passing 0 as the step only works when there are other reasons to break
out of the BPP loop in intel_dp_mtp_tu_compute_config(). Otherwise, an
infinite loop might occur. Fix it by explicitly checking for 0 step.

Fixes: ef0a0757bb ("drm/i915/dp: compute config for 128b/132b SST w/o DSC")
Reported-by: Imre Deak <imre.deak@intel.com>
Closes: https://lore.kernel.org/r/Z6I0knh2Kt5T0JrT@ideak-desk.fi.intel.com
Reviewed-by: Imre Deak <imre.deak@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20250204154925.3001781-1-jani.nikula@intel.com
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
(cherry picked from commit a40e718d34d3d02c781c295466b013415f68c4f1)
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
This commit is contained in:
Jani Nikula 2025-02-04 17:49:25 +02:00 • committed by Rodrigo Vivi
parent 230b19bc2b
commit 069504f1fc
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1 changed files with 4 additions and 0 deletions
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4
drivers/gpu/drm/i915/display/intel_dp_mst.c
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@ -341,6 +341,10 @@ int intel_dp_mtp_tu_compute_config(struct intel_dp *intel_dp,
break;
}
/* Allow using zero step to indicate one try */
if (!step)
break;
}
if (slots < 0) {