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drm/nouveau/disp/dp: respect sink limits when selecting failsafe link configuration

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[ Upstream commit 13d03e9daf70dab032c03dc172e75bb98ad899c4 ]

Where possible, we want the failsafe link configuration (one which won't
hang the OR during modeset because of not enough bandwidth for the mode)
to also be supported by the sink.

This prevents "link rate unsupported by sink" messages when link training
fails.

Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Ben Skeggs 2019-05-10 11:57:04 +10:00 committed by Greg Kroah-Hartman
parent 4b3d4b81e5
commit 6257b7c80d
1 changed files with 9 additions and 2 deletions
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11
drivers/gpu/drm/nouveau/nvkm/engine/disp/dp.c
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@ -364,8 +364,15 @@ nvkm_dp_train(struct nvkm_dp *dp, u32 dataKBps)
* and it's better to have a failed modeset than that.
*/
for (cfg = nvkm_dp_rates; cfg->rate; cfg++) {
if (cfg->nr <= outp_nr && cfg->nr <= outp_bw)
failsafe = cfg;
if (cfg->nr <= outp_nr && cfg->nr <= outp_bw) {
/* Try to respect sink limits too when selecting
* lowest link configuration.
*/
if (!failsafe ||
(cfg->nr <= sink_nr && cfg->bw <= sink_bw))
failsafe = cfg;
}
if (failsafe && cfg[1].rate < dataKBps)
break;
}