6.7-stable review patch. If anyone has any objections, please let me know. ------------------ From: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx> commit ad26d56d080780bbfcc1696ca0c0cce3e2124ef6 upstream. 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@xxxxxxxxxxxxxxx Signed-off-by: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx> Link: https://patchwork.freedesktop.org/patch/msgid/20240208154552.14545-1-ville.syrjala@xxxxxxxxxxxxxxx Reviewed-by: Jani Nikula <jani.nikula@xxxxxxxxx> (cherry picked from commit 6061811d72e14f41f71b6a025510920b187bfcca) Signed-off-by: Joonas Lahtinen <joonas.lahtinen@xxxxxxxxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- drivers/gpu/drm/i915/display/intel_dp.c | 3 +++ 1 file changed, 3 insertions(+) --- a/drivers/gpu/drm/i915/display/intel_dp.c +++ b/drivers/gpu/drm/i915/display/intel_dp.c @@ -2275,6 +2275,9 @@ intel_dp_compute_config_limits(struct in 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);
