Comment # 1
on bug 107607
from Paul Menzel
Created attachment 141201 [details]
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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