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drm/i915/dp: Limit SST link rate to <=8.1Gbps

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Limit the link rate to HBR3 or below (<=8.1Gbps) in SST mode.
UHBR (10Gbps+) link rates require 128b/132b channel encoding
which we have not yet hooked up into the SST/no-sideband codepaths.

Cc: stable@vger.kernel.org
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240208154552.14545-1-ville.syrjala@linux.intel.com
Reviewed-by: Jani Nikula <jani.nikula@intel.com>
This commit is contained in:
Ville Syrjälä 2024-02-08 17:45:52 +02:00
parent 6074be620c
commit 6061811d72
1 changed files with 3 additions and 0 deletions
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3
drivers/gpu/drm/i915/display/intel_dp.c
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@ -2356,6 +2356,9 @@ intel_dp_compute_config_limits(struct intel_dp *intel_dp,
limits->min_rate = intel_dp_common_rate(intel_dp, 0);
limits->max_rate = intel_dp_max_link_rate(intel_dp);
/* FIXME 128b/132b SST support missing */
limits->max_rate = min(limits->max_rate, 810000);
limits->min_lane_count = 1;
limits->max_lane_count = intel_dp_max_lane_count(intel_dp);