[Intel-gfx] [PATCH 6/8] drm/i915: Allow up to 32KB stride on SKL+ "sprites"

[Daniel Vetter]

On Fri, Dec 22, 2017 at 09:22:29PM +0200, Ville Syrjala wrote:
> From: Ville Syrjälä <ville.syrjala at linux.intel.com>
> 
> SKL+ "sprites" no longer have 16KB max stride limit that earlier
> platforms had. Bump up the limit to 32KB.
> 
> Cc: Ben Widawsky <ben at bwidawsk.net>
> Cc: Jason Ekstrand <jason at jlekstrand.net>
> Cc: Daniel Stone <daniels at collabora.com>
> Signed-off-by: Ville Syrjälä <ville.syrjala at linux.intel.com>
> ---
>  drivers/gpu/drm/i915/intel_sprite.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/i915/intel_sprite.c b/drivers/gpu/drm/i915/intel_sprite.c
> index cb06acff283d..94188488db05 100644
> --- a/drivers/gpu/drm/i915/intel_sprite.c
> +++ b/drivers/gpu/drm/i915/intel_sprite.c
> @@ -865,6 +865,7 @@ intel_check_sprite_plane(struct intel_plane *plane,
>  	struct drm_rect *src = &state->base.src;
>  	struct drm_rect *dst = &state->base.dst;
>  	const struct drm_rect *clip = &state->clip;
> +	int max_stride = INTEL_GEN(dev_priv) >= 9 ? 32768 : 16384;
>  	int hscale, vscale;
>  	int max_scale, min_scale;
>  	bool can_scale;
> @@ -885,7 +886,7 @@ intel_check_sprite_plane(struct intel_plane *plane,
>  	}
>  
>  	/* FIXME check all gen limits */
> -	if (fb->width < 3 || fb->height < 3 || fb->pitches[0] > 16384) {
> +	if (fb->width < 3 || fb->height < 3 || fb->pitches[0] > max_stride) {
>  		DRM_DEBUG_KMS("Unsuitable framebuffer for plane\n");
>  		return -EINVAL;

Since pre-gen9 sprites are special, and since we're already validating the
overall sprite limits in intel_fb_pitch_limit I'd push this into a new if
condition like

	if (gen < 9 && pichtes[0] > KB(16)) {
  		DRM_DEBUG_KMS("Invalid stride\n");
  		return -EINVAL;
	}

With or without that bikeshed:

Reviewed-by: Daniel Vetter <daniel.vetter at ffwll.ch>
-- 
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch