drm/dp: retry AUX transactions 32 times (v1.1)
commit 19a93f04 upstream. At least on two MST devices I've tested with, when they are link training downstream, they are totally unable to handle aux ch msgs, so they defer like nuts. I tried 16, it wasn't enough, 32 seems better. This fixes one Dell 4k monitor and one of the MST hubs. v1.1: fixup comment (Tom). Acked-by:Alex Deucher <alexander.deucher@amd.com> Signed-off-by:
Dave Airlie <airlied@redhat.com> Signed-off-by:
Luis Henriques <luis.henriques@canonical.com>
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