On Tue, May 28, 2019 at 07:42:19PM -0600, Jeffrey Hugo wrote:
Do you know if the nexus 5 has a video or command mode panel? There is some glitchyness with vblanks and command mode panels.
Its in command mode. I know this because I see two 'pp done time out' messages, even on 4.17. Based on my understanding, the ping pong code is only applicable for command mode panels.
Actually, the ping pong element exists in both modes, but 'pp done time out' is a good indicator that it is command mode.
Are you also seeing vblank timeouts?
Yes, here's a snippet of the first one.
[ 2.556014] WARNING: CPU: 0 PID: 5 at drivers/gpu/drm/drm_atomic_helper.c:1429 drm_atomic_helper_wait_for_vblanks.part.1+0x288/0x290 [ 2.556020] [CRTC:49:crtc-0] vblank wait timed out [ 2.556023] Modules linked in: [ 2.556034] CPU: 0 PID: 5 Comm: kworker/0:0 Not tainted 5.2.0-rc1-00178-g72c3c1fd5f86-dirty #426 [ 2.556038] Hardware name: Generic DT based system [ 2.556056] Workqueue: events deferred_probe_work_func ...
Do you have busybox?
Can you run - sudo busybox devmem 0xFD900614 sudo busybox devmem 0xFD900714 sudo busybox devmem 0xFD900814 sudo busybox devmem 0xFD900914 sudo busybox devmem 0xFD900A14
# busybox devmem 0xFD900614 0x00020020 # busybox devmem 0xFD900714 0x00000000 # busybox devmem 0xFD900814 0x00000000 # busybox devmem 0xFD900914 0x00000000 # busybox devmem 0xFD900A14 0x00000000
I get the same values with the mainline kernel and 4.17.
Brian