drm/format-helper: Streamline blit-helper interface

Move destination-buffer clipping from format-helper blit function into
caller. Rename drm_fb_blit_rect_dstclip() to drm_fb_blit_toio(). Done for
consistency with the rest of the interface. Remove drm_fb_blit_dstclip(),
which isn't required.

Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Reviewed-by: Noralf Trønnes <noralf@tronnes.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20211110103702.374-6-tzimmermann@suse.de

drivers/gpu/drm/drm_format_helper.c

@@ -472,7 +472,7 @@ void drm_fb_xrgb8888_to_gray8(void *dst, unsigned int dst_pitch, const void *vad
 EXPORT_SYMBOL(drm_fb_xrgb8888_to_gray8);
 
 /**
- * drm_fb_blit_rect_dstclip - Copy parts of a framebuffer to display memory
+ * drm_fb_blit_toio - Copy parts of a framebuffer to display memory
  * @dst:	The display memory to copy to
  * @dst_pitch:	Number of bytes between two consecutive scanlines within dst
  * @dst_format:	FOURCC code of the display's color format
@@ -484,17 +484,14 @@ EXPORT_SYMBOL(drm_fb_xrgb8888_to_gray8);
  * formats of the display and the framebuffer mismatch, the blit function
  * will attempt to convert between them.
  *
- * Use drm_fb_blit_dstclip() to copy the full framebuffer.
- *
  * Returns:
  * 0 on success, or
  * -EINVAL if the color-format conversion failed, or
  * a negative error code otherwise.
  */
-int drm_fb_blit_rect_dstclip(void __iomem *dst, unsigned int dst_pitch,
-			     uint32_t dst_format, void *vmap,
-			     struct drm_framebuffer *fb,
-			     struct drm_rect *clip)
+int drm_fb_blit_toio(void __iomem *dst, unsigned int dst_pitch, uint32_t dst_format,
+		     const void *vmap, const struct drm_framebuffer *fb,
+		     const struct drm_rect *clip)
 {
 	uint32_t fb_format = fb->format->format;
 
@@ -505,57 +502,21 @@ int drm_fb_blit_rect_dstclip(void __iomem *dst, unsigned int dst_pitch,
 		dst_format = DRM_FORMAT_XRGB8888;
 
 	if (dst_format == fb_format) {
-		dst += clip_offset(clip, dst_pitch, fb->format->cpp[0]);
 		drm_fb_memcpy_toio(dst, dst_pitch, vmap, fb, clip);
 		return 0;
 
 	} else if (dst_format == DRM_FORMAT_RGB565) {
 		if (fb_format == DRM_FORMAT_XRGB8888) {
-			dst += clip_offset(clip, dst_pitch, fb->format->cpp[0]);
-			drm_fb_xrgb8888_to_rgb565_toio(dst, dst_pitch, vmap, fb, clip,
-						       false);
+			drm_fb_xrgb8888_to_rgb565_toio(dst, dst_pitch, vmap, fb, clip, false);
 			return 0;
 		}
 	} else if (dst_format == DRM_FORMAT_RGB888) {
 		if (fb_format == DRM_FORMAT_XRGB8888) {
-			dst += clip_offset(clip, dst_pitch, fb->format->cpp[0]);
 			drm_fb_xrgb8888_to_rgb888_toio(dst, dst_pitch, vmap, fb, clip);
 			return 0;
 		}
 	}
 
 	return -EINVAL;
 }
-EXPORT_SYMBOL(drm_fb_blit_rect_dstclip);
-
-/**
- * drm_fb_blit_dstclip - Copy framebuffer to display memory
- * @dst:	The display memory to copy to
- * @dst_pitch:	Number of bytes between two consecutive scanlines within dst
- * @dst_format:	FOURCC code of the display's color format
- * @vmap:	The framebuffer memory to copy from
- * @fb:		The framebuffer to copy from
- *
- * This function copies a full framebuffer to display memory. If the formats
- * of the display and the framebuffer mismatch, the copy function will
- * attempt to convert between them.
- *
- * See drm_fb_blit_rect_dstclip() for more information.
- *
- * Returns:
- * 0 on success, or a negative error code otherwise.
- */
-int drm_fb_blit_dstclip(void __iomem *dst, unsigned int dst_pitch,
-			uint32_t dst_format, void *vmap,
-			struct drm_framebuffer *fb)
-{
-	struct drm_rect fullscreen = {
-		.x1 = 0,
-		.x2 = fb->width,
-		.y1 = 0,
-		.y2 = fb->height,
-	};
-	return drm_fb_blit_rect_dstclip(dst, dst_pitch, dst_format, vmap, fb,
-					&fullscreen);
-}
-EXPORT_SYMBOL(drm_fb_blit_dstclip);
+EXPORT_SYMBOL(drm_fb_blit_toio);

drivers/gpu/drm/tiny/simpledrm.c

@@ -641,6 +641,8 @@ simpledrm_simple_display_pipe_enable(struct drm_simple_display_pipe *pipe,
 	struct drm_framebuffer *fb = plane_state->fb;
 	void *vmap = shadow_plane_state->data[0].vaddr; /* TODO: Use mapping abstraction */
 	struct drm_device *dev = &sdev->dev;
+	void __iomem *dst = sdev->screen_base;
+	struct drm_rect clip;
 	int idx;
 
 	if (!fb)
@@ -649,8 +651,11 @@ simpledrm_simple_display_pipe_enable(struct drm_simple_display_pipe *pipe,
 	if (!drm_dev_enter(dev, &idx))
 		return;
 
-	drm_fb_blit_dstclip(sdev->screen_base, sdev->pitch,
-			    sdev->format->format, vmap, fb);
+	drm_rect_init(&clip, 0, 0, fb->width, fb->height);
+
+	dst += drm_fb_clip_offset(sdev->pitch, sdev->format, &clip);
+	drm_fb_blit_toio(dst, sdev->pitch, sdev->format->format, vmap, fb, &clip);
+
 	drm_dev_exit(idx);
 }
 
@@ -680,6 +685,7 @@ simpledrm_simple_display_pipe_update(struct drm_simple_display_pipe *pipe,
 	void *vmap = shadow_plane_state->data[0].vaddr; /* TODO: Use mapping abstraction */
 	struct drm_framebuffer *fb = plane_state->fb;
 	struct drm_device *dev = &sdev->dev;
+	void __iomem *dst = sdev->screen_base;
 	struct drm_rect clip;
 	int idx;
 
@@ -692,8 +698,8 @@ simpledrm_simple_display_pipe_update(struct drm_simple_display_pipe *pipe,
 	if (!drm_dev_enter(dev, &idx))
 		return;
 
-	drm_fb_blit_rect_dstclip(sdev->screen_base, sdev->pitch,
-				 sdev->format->format, vmap, fb, &clip);
+	dst += drm_fb_clip_offset(sdev->pitch, sdev->format, &clip);
+	drm_fb_blit_toio(dst, sdev->pitch, sdev->format->format, vmap, fb, &clip);
 
 	drm_dev_exit(idx);
 }

include/drm/drm_format_helper.h

@@ -36,12 +36,8 @@ void drm_fb_xrgb8888_to_rgb888_toio(void __iomem *dst, unsigned int dst_pitch,
 void drm_fb_xrgb8888_to_gray8(void *dst, unsigned int dst_pitch, const void *vaddr,
 			      const struct drm_framebuffer *fb, const struct drm_rect *clip);
 
-int drm_fb_blit_rect_dstclip(void __iomem *dst, unsigned int dst_pitch,
-			     uint32_t dst_format, void *vmap,
-			     struct drm_framebuffer *fb,
-			     struct drm_rect *rect);
-int drm_fb_blit_dstclip(void __iomem *dst, unsigned int dst_pitch,
-			uint32_t dst_format, void *vmap,
-			struct drm_framebuffer *fb);
+int drm_fb_blit_toio(void __iomem *dst, unsigned int dst_pitch, uint32_t dst_format,
+		     const void *vmap, const struct drm_framebuffer *fb,
+		     const struct drm_rect *rect);
 
 #endif /* __LINUX_DRM_FORMAT_HELPER_H */