[Intel-gfx] [PATCH] drm/i915: Also call frontbuffer flip when disabling planes.

[Daniel Vetter]

On Mon, Aug 24, 2015 at 04:38:23PM -0700, Rodrigo Vivi wrote:
> We also need to call the frontbuffer flip to trigger proper
> invalidations when disabling planes. Otherwise we will miss
> screen updates when disabling sprites or cursor.
> 
> On core platforms where HW tracking also works, this issue
> is totally masked because HW tracking triggers PSR exit
> however on VLV/CHV that has only SW tracking we miss screen
> updates when disabling planes.
> 
> It was caught with kms_psr_sink_crc sprite_plane_onoff
> and cursor_plane_onoff subtests running on VLV/CHV.
> 
> This is probably a regression since I can also get this
> with the manual test case, but with so many changes on atomic
> modeset I couldn't track exactly when this was introduced.
> 
> Reviewed-by: Paulo Zanoni <paulo.r.zanoni at intel.com>
> Signed-off-by: Rodrigo Vivi <rodrigo.vivi at intel.com>

Queued for -next, thanks for the patch.
-Daniel

> ---
>  drivers/gpu/drm/i915/intel_display.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
> index f604ce1..930e5d0 100644
> --- a/drivers/gpu/drm/i915/intel_display.c
> +++ b/drivers/gpu/drm/i915/intel_display.c
> @@ -11627,7 +11627,7 @@ int intel_plane_atomic_calc_changes(struct drm_crtc_state *crtc_state,
>  		intel_crtc->atomic.update_wm_pre = true;
>  	}
>  
> -	if (visible)
> +	if (visible || was_visible)
>  		intel_crtc->atomic.fb_bits |=
>  			to_intel_plane(plane)->frontbuffer_bit;
>  
> -- 
> 2.4.3
> 
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-- 
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch