[Bug 107607] Problems with MST display (REG_WAIT takes a while or times out)

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=107607

--- Comment #1 from Paul Menzel <pmenzel+bugs.freedesktop at molgen.mpg.de> ---
Created attachment 141201
  --> https://bugs.freedesktop.org/attachment.cgi?id=141201&action=edit
Linux 4.18+ messages with drm.debug=0xe

Here is a verbose log. I believe it’s related to DP 1.2 and the MST Dell
monitor.

[   15.113453] [drm:generic_reg_wait [amdgpu]] REG_WAIT taking a while: 24ms in
enc1_stream_encoder_dp_blank line:804
[   15.146724] [drm:generic_reg_wait [amdgpu]] REG_WAIT taking a while: 3ms in
optc1_disable_crtc line:513
[   23.953593] [drm:generic_reg_wait [amdgpu]] REG_WAIT taking a while: 5ms in
mpc1_assert_idle_mpcc line:103
[   24.003514] [drm:generic_reg_wait [amdgpu]] REG_WAIT taking a while: 7ms in
mpc1_assert_idle_mpcc line:103
[  100.425097] [drm:generic_reg_wait [amdgpu]] REG_WAIT taking a while: 6ms in
mpc1_assert_idle_mpcc line:103
[  100.441735] [drm:generic_reg_wait [amdgpu]] REG_WAIT taking a while: 7ms in
mpc1_assert_idle_mpcc line:103
[  104.509792] [drm:generic_reg_wait [amdgpu]] *ERROR* REG_WAIT timeout 10us *
3000 tries - enc1_stream_encoder_dp_blank line:804
[  104.509841] WARNING: CPU: 1 PID: 1550 at
drivers/gpu/drm/amd/amdgpu/../display/dc/dc_helper.c:254
generic_reg_wait+0xe7/0x160 [amdgpu]
[  104.509895] RIP: 0010:generic_reg_wait+0xe7/0x160 [amdgpu]
[  104.517863] [drm:generic_reg_wait [amdgpu]] REG_WAIT taking a while: 2ms in
optc1_disable_crtc line:513
[  108.605859] [drm:generic_reg_wait [amdgpu]] *ERROR* REG_WAIT timeout 10us *
3000 tries - enc1_stream_encoder_dp_blank line:804
[  108.605909] WARNING: CPU: 2 PID: 1550 at
drivers/gpu/drm/amd/amdgpu/../display/dc/dc_helper.c:254
generic_reg_wait+0xe7/0x160 [amdgpu]
[  108.605964] RIP: 0010:generic_reg_wait+0xe7/0x160 [amdgpu]
[  108.610990] [drm:generic_reg_wait [amdgpu]] REG_WAIT taking a while: 1ms in
optc1_disable_crtc line:513
[  110.529644] [drm:generic_reg_wait [amdgpu]] REG_WAIT taking a while: 3ms in
optc1_wait_for_state line:782
[  110.536052] [drm:generic_reg_wait [amdgpu]] REG_WAIT taking a while: 2ms in
optc1_wait_for_state line:782
[  115.561370] [drm:generic_reg_wait [amdgpu]] REG_WAIT taking a while: 2ms in
mpc1_assert_idle_mpcc line:103
[  115.578008] [drm:generic_reg_wait [amdgpu]] REG_WAIT taking a while: 5ms in
mpc1_assert_idle_mpcc line:103
[  115.686970] [drm:generic_reg_wait [amdgpu]] *ERROR* REG_WAIT timeout 10us *
3000 tries - enc1_stream_encoder_dp_blank line:804
[  115.687021] WARNING: CPU: 3 PID: 48 at
drivers/gpu/drm/amd/amdgpu/../display/dc/dc_helper.c:254
generic_reg_wait+0xe7/0x160 [amdgpu]
[  115.687079] RIP: 0010:generic_reg_wait+0xe7/0x160 [amdgpu]
[  115.694125] [drm:generic_reg_wait [amdgpu]] REG_WAIT taking a while: 2ms in
optc1_disable_crtc line:513
[  115.737576] [drm:generic_reg_wait [amdgpu]] *ERROR* REG_WAIT timeout 10us *
3000 tries - enc1_stream_encoder_dp_blank line:804
[  115.737626] WARNING: CPU: 3 PID: 48 at
drivers/gpu/drm/amd/amdgpu/../display/dc/dc_helper.c:254
generic_reg_wait+0xe7/0x160 [amdgpu]
[  115.737678] RIP: 0010:generic_reg_wait+0xe7/0x160 [amdgpu]
[  115.744042] [drm:generic_reg_wait [amdgpu]] REG_WAIT taking a while: 1ms in
optc1_disable_crtc line:513
[  116.250536] [drm:generic_reg_wait [amdgpu]] REG_WAIT taking a while: 1ms in
optc1_wait_for_state line:782
[  116.267508] [drm:generic_reg_wait [amdgpu]] REG_WAIT taking a while: 5ms in
mpc1_assert_idle_mpcc line:103
[  256.781411] [drm:generic_reg_wait [amdgpu]] REG_WAIT taking a while: 5ms in
mpc1_assert_idle_mpcc line:103
[  256.798049] [drm:generic_reg_wait [amdgpu]] REG_WAIT taking a while: 7ms in
mpc1_assert_idle_mpcc line:103
[  256.830971] [drm:generic_reg_wait [amdgpu]] REG_WAIT taking a while: 3ms in
optc1_disable_crtc line:513
[  256.864242] [drm:generic_reg_wait [amdgpu]] REG_WAIT taking a while: 5ms in
optc1_disable_crtc line:513
[  260.684885] [drm:generic_reg_wait [amdgpu]] REG_WAIT taking a while: 2ms in
optc1_wait_for_state line:782
[  260.701867] [drm:generic_reg_wait [amdgpu]] REG_WAIT taking a while: 6ms in
mpc1_assert_idle_mpcc line:103

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