Commit ad26d56d authored by Ville Syrjälä's avatar Ville Syrjälä Committed by Joonas Lahtinen
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drm/i915/dp: Limit SST link rate to <=8.1Gbps 



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: default avatarVille Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240208154552.14545-1-ville.syrjala@linux.intel.com


Reviewed-by: default avatarJani Nikula <jani.nikula@intel.com>
(cherry picked from commit 6061811d)
Signed-off-by: default avatarJoonas Lahtinen <joonas.lahtinen@linux.intel.com>
parent 962ac2dc

drivers/gpu/drm/i915/display/intel_dp.c

+3 −0
Original line number Diff line number Diff line
@@ -2355,6 +2355,9 @@ 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);