drm/amdgpu: Retry DDC probing on DVI on failure if we got an HPD interrupt
authorxurui <xurui@kylinos.cn>
Fri, 23 Dec 2022 09:28:58 +0000 (17:28 +0800)
committerAlex Deucher <alexander.deucher@amd.com>
Thu, 5 Jan 2023 16:42:09 +0000 (11:42 -0500)
commit90f56611fc5b54d55e94ded1d494d6090649bdb6
tree34b5552cfe696d20421afc424a85b38481d2fc06
parentf200521899d22ec37ddb927f6a5755d8eacbc9e5
drm/amdgpu: Retry DDC probing on DVI on failure if we got an HPD interrupt

HPD signals on DVI ports can be fired off before the pins required for
DDC probing actually make contact, due to the pins for HPD making
contact first. This results in a HPD signal being asserted but DDC
probing failing, resulting in hotplugging occasionally failing.

Rescheduling the hotplug work for a second when we run into an HPD
signal with a failing DDC probe usually gives enough time for the rest
of the connector's pins to make contact, and fixes this issue.

Signed-off-by: xurui <xurui@kylinos.cn>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
drivers/gpu/drm/amd/amdgpu/amdgpu.h
drivers/gpu/drm/amd/amdgpu/amdgpu_connectors.c
drivers/gpu/drm/amd/amdgpu/amdgpu_display.c
drivers/gpu/drm/amd/amdgpu/amdgpu_mode.h
drivers/gpu/drm/amd/amdgpu/dce_v10_0.c
drivers/gpu/drm/amd/amdgpu/dce_v11_0.c
drivers/gpu/drm/amd/amdgpu/dce_v6_0.c
drivers/gpu/drm/amd/amdgpu/dce_v8_0.c