Re: [PATCH] Revert "drm/amdgpu/display: set vblank_disable_immediate for DC"

[Harry Wentland <harry.wentland@amd.com>]

On 2022-06-20 18:38, Alex Deucher wrote:
> This reverts commit 92020e81ddbeac351ea4a19bcf01743f32b9c800.
> 
> This causes stuttering and timeouts with DMCUB for some users
> so revert it until we understand why and and safely enable it
> to save power.
> 
> Bug: https://gitlab.freedesktop.org/drm/amd/-/issues/1887
> Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
> Cc: Nicholas Kazlauskas <nicholas.kazlauskas@amd.com>

Acked-by: Harry Wentland <harry.wentland@amd.com>

Harry

> ---
>  drivers/gpu/drm/amd/amdgpu/amdgpu_irq.c           | 1 +
>  drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c | 3 ---
>  2 files changed, 1 insertion(+), 3 deletions(-)
> 
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_irq.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_irq.c
> index b4cf8717f554..89011bae7588 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_irq.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_irq.c
> @@ -320,6 +320,7 @@ int amdgpu_irq_init(struct amdgpu_device *adev)
>  	if (!amdgpu_device_has_dc_support(adev)) {
>  		if (!adev->enable_virtual_display)
>  			/* Disable vblank IRQs aggressively for power-saving */
> +			/* XXX: can this be enabled for DC? */
>  			adev_to_drm(adev)->vblank_disable_immediate = true;
>  
>  		r = drm_vblank_init(adev_to_drm(adev), adev->mode_info.num_crtc);
> diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
> index c2bc7db85d7e..24959cb85c48 100644
> --- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
> +++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
> @@ -4293,9 +4293,6 @@ static int amdgpu_dm_initialize_drm_device(struct amdgpu_device *adev)
>  		}
>  	}
>  
> -	/* Disable vblank IRQs aggressively for power-saving. */
> -	adev_to_drm(adev)->vblank_disable_immediate = true;
> -
>  	/* loops over all connectors on the board */
>  	for (i = 0; i < link_cnt; i++) {
>  		struct dc_link *link = NULL;