[Intel-gfx] [PATCH] drm/i915: Skip fence installation for objects with rotated views (v2)

[Ville Syrjälä]

On Mon, Oct 26, 2015 at 06:23:26PM -0700, Vivek Kasireddy wrote:
> While pinning a fb object to the display plane, only install a fence
> if the object is using a normal view. This corresponds with the
> behavior found in i915_gem_object_do_pin() where the fencability
> criteria is determined only for objects with normal views.
> 
> v2:
> Look at the object's map_and_fenceable flag to determine whether to
> install a fence or not (Chris).
> 
> Cc: Chris Wilson <chris at chris-wilson.co.uk>
> Cc: Tvrtko Ursulin <tvrtko.ursulin at intel.com>
> Cc: Daniel Vetter <daniel at ffwll.ch>
> Signed-off-by: Vivek Kasireddy <vivek.kasireddy at intel.com>
> ---
>  drivers/gpu/drm/i915/intel_display.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
> index 52fb3f2..108c000 100644
> --- a/drivers/gpu/drm/i915/intel_display.c
> +++ b/drivers/gpu/drm/i915/intel_display.c
> @@ -2357,7 +2357,8 @@ intel_pin_and_fence_fb_obj(struct drm_plane *plane,
>  	 * framebuffer compression.  For simplicity, we always install
>  	 * a fence as the cost is not that onerous.
>  	 */
> -	ret = i915_gem_object_get_fence(obj);
> +	if (obj->map_and_fenceable)

This will now get the fence and pin it for the 90/270 view as well,
even though the fence doesn't even cover that particualr gtt mapping.

> +		ret = i915_gem_object_get_fence(obj);
>  	if (ret == -EDEADLK) {
>  		/*
>  		 * -EDEADLK means there are no free fences
> -- 
> 2.4.3
> 
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-- 
Ville Syrjälä
Intel OTC