Re: [PATCH] drm/amd/display: remove need of modeset flag for overlay planes

[Harry Wentland <harry.wentland-5C7GfCeVMHo@public.gmane.org>]

On 2018-04-27 06:27 AM, Shirish S wrote:
> This patch is in continuation to the
> "843e3c7 drm/amd/display: defer modeset check in dm_update_planes_state"
> where we started to eliminate the dependency on
> DRM_MODE_ATOMIC_ALLOW_MODESET to be set by the user space,
> which as such is not mandatory.
> 
> After deferring, this patch eliminates the dependency on the flag
> for overlay planes.
> 
> This has to be done in stages as its a pretty complex and requires thorough
> testing before we free primary planes as well from dependency on modeset
> flag.
> 
> Signed-off-by: Shirish S <shirish.s@amd.com>

After the offline discussion I'm okay to go ahead with this as it should be relatively self-contained and currently unblocks one use-case. We'll definitely need to address this code soon and find a good way to stop abusing the allow_modeset flag.

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

If this does cause unexpected fallout we can always revert and revisit.

Harry

> ---
>  drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c | 8 +++++---
>  1 file changed, 5 insertions(+), 3 deletions(-)
> 
> 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 1a63c04..87b661d 100644
> --- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
> +++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
> @@ -4174,7 +4174,7 @@ static void amdgpu_dm_commit_planes(struct drm_atomic_state *state,
>  		}
>  		spin_unlock_irqrestore(&crtc->dev->event_lock, flags);
>  
> -		if (!pflip_needed) {
> +		if (!pflip_needed || plane->type == DRM_PLANE_TYPE_OVERLAY) {
>  			WARN_ON(!dm_new_plane_state->dc_state);
>  
>  			plane_states_constructed[planes_count] = dm_new_plane_state->dc_state;
> @@ -4884,7 +4884,8 @@ static int dm_update_planes_state(struct dc *dc,
>  
>  		/* Remove any changed/removed planes */
>  		if (!enable) {
> -			if (pflip_needed)
> +			if (pflip_needed &&
> +			    plane && plane->type != DRM_PLANE_TYPE_OVERLAY)
>  				continue;
>  
>  			if (!old_plane_crtc)
> @@ -4931,7 +4932,8 @@ static int dm_update_planes_state(struct dc *dc,
>  			if (!dm_new_crtc_state->stream)
>  				continue;
>  
> -			if (pflip_needed)
> +			if (pflip_needed &&
> +			    plane && plane->type != DRM_PLANE_TYPE_OVERLAY)
>  				continue;
>  
>  			WARN_ON(dm_new_plane_state->dc_state);
> 
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