Quoting Dhinakaran Pandiyan (2018-02-16 04:33:21)
> Preparing a framebuffer should not require a flush. _post_plane_update()
> takes care of flushing when a flip is scheduled, this should be
> sufficient for PSR and FBC.

Makes sense.
 
> Cc: Paulo Zanoni <paulo.r.zan...@intel.com>
> Cc: Ville Syrjälä <ville.syrj...@linux.intel.com>
> Cc: Chris Wilson <ch...@chris-wilson.co.uk>
> Signed-off-by: Dhinakaran Pandiyan <dhinakaran.pandi...@intel.com>

Also
Cc: Maarten Lankhorst <maarten.lankho...@linux.intel.com>
to validate the flow through atomic.
-Chris

> ---
>  drivers/gpu/drm/i915/intel_display.c | 6 ++----
>  1 file changed, 2 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/intel_display.c 
> b/drivers/gpu/drm/i915/intel_display.c
> index 24ca43424c44..c611855bf05a 100644
> --- a/drivers/gpu/drm/i915/intel_display.c
> +++ b/drivers/gpu/drm/i915/intel_display.c
> @@ -12717,12 +12717,10 @@ intel_prepare_plane_fb(struct drm_plane *plane,
>                 struct i915_vma *vma;
>  
>                 vma = intel_pin_and_fence_fb_obj(fb, new_state->rotation);
> -               if (!IS_ERR(vma)) {
> +               if (!IS_ERR(vma))
>                         to_intel_plane_state(new_state)->vma = vma;
> -                       intel_fb_obj_flush(obj, ORIGIN_DIRTYFB);
> -               } else {
> +               else
>                         ret =  PTR_ERR(vma);
> -               }
>         }
>  
>         i915_gem_object_wait_priority(obj, 0, I915_PRIORITY_DISPLAY);
> -- 
> 2.14.1
> 
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