[Intel-gfx] [RFC] drm/i915: Add gen check for fb size

[Daniel Vetter]

On Fri, Jul 10, 2015 at 04:45:12PM +0530, Vandana Kannan wrote:
> From gen7, the platform can support fb of size < 3x3.
> Adding this check for gen along with fb width & height.
> Note: IVB is gen7 but its not clear if it can support width < 3 and
> height < 3.
> 
> This patch has been tested in Android environment.
> 
> Signed-off-by: Vandana Kannan <vandana.kannan at intel.com>

What exactly are you usinga  3x3 framebuffer for? Imo this needs userspace
plus igt testcases and all that, but really not sure why this would be
worth it ever.
-Daniel

> ---
>  drivers/gpu/drm/i915/intel_sprite.c | 7 ++++++-
>  1 file changed, 6 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/i915/intel_sprite.c b/drivers/gpu/drm/i915/intel_sprite.c
> index cd21525..310d0a7 100644
> --- a/drivers/gpu/drm/i915/intel_sprite.c
> +++ b/drivers/gpu/drm/i915/intel_sprite.c
> @@ -770,8 +770,13 @@ intel_check_sprite_plane(struct drm_plane *plane,
>  		return -EINVAL;
>  	}
>  
> +	if (INTEL_INFO(dev)->gen < 7 && (fb->width < 3 || fb->height < 3)) {
> +		DRM_DEBUG_KMS("Unsuitable framebuffer for plane\n");
> +		return -EINVAL;
> +	}
> +
>  	/* FIXME check all gen limits */
> -	if (fb->width < 3 || fb->height < 3 || fb->pitches[0] > 16384) {
> +	if (fb->pitches[0] > 16384) {
>  		DRM_DEBUG_KMS("Unsuitable framebuffer for plane\n");
>  		return -EINVAL;
>  	}
> -- 
> 2.0.1
> 
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-- 
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch