[PATCH] drm/amdgpu: Fix S3 resume failre.

[Andrey Grodzovsky]

On 07/19/2018 11:25 AM, Christian König wrote:
> Am 19.07.2018 um 17:19 schrieb Andrey Grodzovsky:
>> Problem:
>> FB is still not unpinned during the first run of amdgpu_bo_evict_vram
>> and so it's left for the second run, but during second run the SDMA for
>> moving buffer around already disabled and you have to do
>> it with CPU, but FB is not in visible VRAM and hence the eviction 
>> failure
>> leading later to resume failure.
>>
>> Fix:
>> When DAL in use get a pointer to FB from crtc->primary->state rather
>> then from crtc->primary which is not set for DAL since it supports
>> atomic KMS.
>
> Nice catch, but could we add a helper for unpinning them and just 
> unpin both instead of checking if DC is enabled or not?

They are mutually exclusive, once is only used in legacy drivers another 
only in atomic KMS drivers.

Andrey

>
> I think that would be a little bit cleaner.
>
> Christian.
>
>>
>> Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=107065
>> Fixes e00fb85 drm: Stop updating plane->crtc/fb/old_fb on atomic drivers
>> Signed-off-by: Andrey Grodzovsky <andrey.grodzovsky at amd.com>
>> ---
>>   drivers/gpu/drm/amd/amdgpu/amdgpu_device.c | 3 ++-
>>   1 file changed, 2 insertions(+), 1 deletion(-)
>>
>> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c 
>> b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
>> index 709e4a3..dd9ebf7 100644
>> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
>> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
>> @@ -2642,7 +2642,8 @@ int amdgpu_device_suspend(struct drm_device 
>> *dev, bool suspend, bool fbcon)
>>       /* unpin the front buffers and cursors */
>>       list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
>>           struct amdgpu_crtc *amdgpu_crtc = to_amdgpu_crtc(crtc);
>> -        struct drm_framebuffer *fb = crtc->primary->fb;
>> +         struct drm_framebuffer *fb = 
>> amdgpu_device_has_dc_support(adev) ?
>> +                 crtc->primary->state->fb : crtc->primary->fb;
>>           struct amdgpu_bo *robj;
>>             if (amdgpu_crtc->cursor_bo) {
>