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

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

On 2021-11-10 10:26, Alex Deucher wrote:
> Disable vblanks immediately to save power.  I think this was
> missed when we merged DC support.
> 
> Bug: https://gitlab.freedesktop.org/drm/amd/-/issues/1781
> Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

Reviewed-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, 3 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_irq.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_irq.c
> index cc2e0c9cfe0a..4f3c62adccbd 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_irq.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_irq.c
> @@ -333,7 +333,6 @@ 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 1371432c8f11..652c973e6daa 100644
> --- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
> +++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
> @@ -1590,6 +1590,9 @@ static int amdgpu_dm_init(struct amdgpu_device *adev)
>  	adev_to_drm(adev)->mode_config.cursor_width = adev->dm.dc->caps.max_cursor_size;
>  	adev_to_drm(adev)->mode_config.cursor_height = adev->dm.dc->caps.max_cursor_size;
>  
> +	/* Disable vblank IRQs aggressively for power-saving */
> +	adev_to_drm(adev)->vblank_disable_immediate = true;
> +
>  	if (drm_vblank_init(adev_to_drm(adev), adev->dm.display_indexes_num)) {
>  		DRM_ERROR(
>  		"amdgpu: failed to initialize sw for display support.\n");
>