Re: [PATCH -v3 3/4] drm/i915: split intel_cursor_plane_update() into check() and commit()

["Ville Syrjälä" <ville.syrjala@linux.intel.com>]

On Wed, Sep 03, 2014 at 05:10:17PM -0300, Gustavo Padovan wrote:
> From: Gustavo Padovan <gustavo.padovan@collabora.co.uk>
> 
> Due to the upcoming atomic modesetting feature we need to separate
> some update functions into a check step that can fail and a commit
> step that should, ideally, never fail.
> 
> The commit part can still fail, but that should be solved in another
> upcoming patch.
> 
> Signed-off-by: Gustavo Padovan <gustavo.padovan@collabora.co.uk>
> ---
>  drivers/gpu/drm/i915/intel_display.c | 104 ++++++++++++++++++++++-------------
>  1 file changed, 67 insertions(+), 37 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
> index 22d3902..c3f1967 100644
> --- a/drivers/gpu/drm/i915/intel_display.c
> +++ b/drivers/gpu/drm/i915/intel_display.c
> @@ -11896,51 +11896,42 @@ intel_cursor_plane_disable(struct drm_plane *plane)
>  }
>  
>  static int
> -intel_cursor_plane_update(struct drm_plane *plane, struct drm_crtc *crtc,
> -			  struct drm_framebuffer *fb, int crtc_x, int crtc_y,
> -			  unsigned int crtc_w, unsigned int crtc_h,
> -			  uint32_t src_x, uint32_t src_y,
> -			  uint32_t src_w, uint32_t src_h)
> +intel_check_cursor_plane(struct drm_plane *plane,
> +			 struct intel_plane_state *state)
>  {
> -	struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
> -	struct intel_framebuffer *intel_fb = to_intel_framebuffer(fb);
> -	struct drm_i915_gem_object *obj = intel_fb->obj;
> -	struct drm_rect dest = {
> -		/* integer pixels */
> -		.x1 = crtc_x,
> -		.y1 = crtc_y,
> -		.x2 = crtc_x + crtc_w,
> -		.y2 = crtc_y + crtc_h,
> -	};
> -	struct drm_rect src = {
> -		/* 16.16 fixed point */
> -		.x1 = src_x,
> -		.y1 = src_y,
> -		.x2 = src_x + src_w,
> -		.y2 = src_y + src_h,
> -	};
> -	const struct drm_rect clip = {
> -		/* integer pixels */
> -		.x2 = intel_crtc->active ? intel_crtc->config.pipe_src_w : 0,
> -		.y2 = intel_crtc->active ? intel_crtc->config.pipe_src_h : 0,
> -	};
> -	bool visible;
> -	int ret;
> +	struct drm_crtc *crtc = state->crtc;
> +	struct drm_framebuffer *fb = state->fb;
> +	struct drm_rect *dest = &state->dst;
> +	struct drm_rect *src = &state->src;
> +	const struct drm_rect *clip = &state->clip;
>  
> -	ret = drm_plane_helper_check_update(plane, crtc, fb,
> -					    &src, &dest, &clip,
> +	return drm_plane_helper_check_update(plane, crtc, fb,
> +					    src, dest, clip,
>  					    DRM_PLANE_HELPER_NO_SCALING,
>  					    DRM_PLANE_HELPER_NO_SCALING,
> -					    true, true, &visible);
> -	if (ret)
> -		return ret;
> +					    true, true, &state->visible);
> +}
>  
> -	crtc->cursor_x = crtc_x;
> -	crtc->cursor_y = crtc_y;
> +static int
> +intel_commit_cursor_plane(struct drm_plane *plane,
> +			  struct intel_plane_state *state)
> +{
> +	struct drm_crtc *crtc = state->crtc;
> +	struct drm_framebuffer *fb = state->fb;
> +	struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
> +	struct intel_framebuffer *intel_fb = to_intel_framebuffer(fb);
> +	struct drm_i915_gem_object *obj = intel_fb->obj;
> +	struct drm_rect *dest = &state->dst;
> +	int crtc_w, crtc_h;
> +
> +	crtc->cursor_x = state->dst.x1;
> +	crtc->cursor_y = state->dst.y1;
>  	if (fb != crtc->cursor->fb) {
> +		crtc_w = drm_rect_width(dest);
> +		crtc_h = drm_rect_height(dest);

These would need to be the original unclipped coordinates since we
program the cursor hardware with those and the hardware clips itself.

>  		return intel_crtc_cursor_set_obj(crtc, obj, crtc_w, crtc_h);
>  	} else {
> -		intel_crtc_update_cursor(crtc, visible);
> +		intel_crtc_update_cursor(crtc, state->visible);
>  
>  		intel_frontbuffer_flip(crtc->dev,
>  				       INTEL_FRONTBUFFER_CURSOR(intel_crtc->pipe));
> @@ -11948,6 +11939,45 @@ intel_cursor_plane_update(struct drm_plane *plane, struct drm_crtc *crtc,
>  		return 0;
>  	}
>  }
> +
> +static int
> +intel_cursor_plane_update(struct drm_plane *plane, struct drm_crtc *crtc,
> +			  struct drm_framebuffer *fb, int crtc_x, int crtc_y,
> +			  unsigned int crtc_w, unsigned int crtc_h,
> +			  uint32_t src_x, uint32_t src_y,
> +			  uint32_t src_w, uint32_t src_h)
> +{
> +	struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
> +	struct intel_plane_state state;
> +	int ret;
> +
> +	state.crtc = crtc;
> +	state.fb = fb;
> +
> +	/* sample coordinates in 16.16 fixed point */
> +	state.src.x1 = src_x;
> +	state.src.x2 = src_x + src_w;
> +	state.src.y1 = src_y;
> +	state.src.y2 = src_y + src_h;
> +
> +	/* integer pixels */
> +	state.dst.x1 = crtc_x;
> +	state.dst.x2 = crtc_x + crtc_w;
> +	state.dst.y1 = crtc_y;
> +	state.dst.y2 = crtc_y + crtc_h;
> +
> +	state.clip.x1 = 0;
> +	state.clip.y1 = 0;
> +	state.clip.x2 = intel_crtc->active ? intel_crtc->config.pipe_src_w : 0;
> +	state.clip.y2 = intel_crtc->active ? intel_crtc->config.pipe_src_h : 0;
> +
> +	ret = intel_check_cursor_plane(plane, &state);
> +	if (ret)
> +		return ret;
> +
> +	return intel_commit_cursor_plane(plane, &state);
> +}
> +
>  static const struct drm_plane_funcs intel_cursor_plane_funcs = {
>  	.update_plane = intel_cursor_plane_update,
>  	.disable_plane = intel_cursor_plane_disable,
> -- 
> 1.9.3

-- 
Ville Syrjälä
Intel OTC