drm/format-helper: Pass destination pitch to drm_fb_memcpy_dstclip()

The memcpy's destination buffer might have a different pitch than the
source. Support different pitches as function argument.

Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Acked-by: Maxime Ripard <maxime@cerno.tech>
Tested-by: nerdopolis <bluescreen_avenger@verizon.net>
Link: https://patchwork.freedesktop.org/patch/msgid/20210430105840.30515-2-tzimmermann@suse.de

drivers/gpu/drm/drm_format_helper.c

@@ -52,19 +52,20 @@ EXPORT_SYMBOL(drm_fb_memcpy);
 /**
  * drm_fb_memcpy_dstclip - Copy clip buffer
  * @dst: Destination buffer (iomem)
+ * @dst_pitch: Number of bytes between two consecutive scanlines within dst
  * @vaddr: Source buffer
  * @fb: DRM framebuffer
  * @clip: Clip rectangle area to copy
  *
  * This function applies clipping on dst, i.e. the destination is a
  * full (iomem) framebuffer but only the clip rect content is copied over.
  */
-void drm_fb_memcpy_dstclip(void __iomem *dst, void *vaddr,
-			   struct drm_framebuffer *fb,
+void drm_fb_memcpy_dstclip(void __iomem *dst, unsigned int dst_pitch,
+			   void *vaddr, struct drm_framebuffer *fb,
 			   struct drm_rect *clip)
 {
 	unsigned int cpp = fb->format->cpp[0];
-	unsigned int offset = clip_offset(clip, fb->pitches[0], cpp);
+	unsigned int offset = clip_offset(clip, dst_pitch, cpp);
 	size_t len = (clip->x2 - clip->x1) * cpp;
 	unsigned int y, lines = clip->y2 - clip->y1;
 
@@ -73,7 +74,7 @@ void drm_fb_memcpy_dstclip(void __iomem *dst, void *vaddr,
 	for (y = 0; y < lines; y++) {
 		memcpy_toio(dst, vaddr, len);
 		vaddr += fb->pitches[0];
-		dst += fb->pitches[0];
+		dst += dst_pitch;
 	}
 }
 EXPORT_SYMBOL(drm_fb_memcpy_dstclip);

drivers/gpu/drm/mgag200/mgag200_mode.c

@@ -1554,7 +1554,7 @@ mgag200_handle_damage(struct mga_device *mdev, struct drm_framebuffer *fb,
 {
 	void *vmap = map->vaddr; /* TODO: Use mapping abstraction properly */
 
-	drm_fb_memcpy_dstclip(mdev->vram, vmap, fb, clip);
+	drm_fb_memcpy_dstclip(mdev->vram, fb->pitches[0], vmap, fb, clip);
 
 	/* Always scanout image at VRAM offset 0 */
 	mgag200_set_startadd(mdev, (u32)0);

drivers/gpu/drm/tiny/cirrus.c

@@ -324,7 +324,7 @@ static int cirrus_fb_blit_rect(struct drm_framebuffer *fb, const struct dma_buf_
 		return -ENODEV;
 
 	if (cirrus->cpp == fb->format->cpp[0])
-		drm_fb_memcpy_dstclip(cirrus->vram,
+		drm_fb_memcpy_dstclip(cirrus->vram, fb->pitches[0],
 				      vmap, fb, rect);
 
 	else if (fb->format->cpp[0] == 4 && cirrus->cpp == 2)

include/drm/drm_format_helper.h

@@ -11,7 +11,7 @@ struct drm_rect;
 
 void drm_fb_memcpy(void *dst, void *vaddr, struct drm_framebuffer *fb,
 		   struct drm_rect *clip);
-void drm_fb_memcpy_dstclip(void __iomem *dst, void *vaddr,
+void drm_fb_memcpy_dstclip(void __iomem *dst, unsigned int dst_pitch, void *vaddr,
 			   struct drm_framebuffer *fb,
 			   struct drm_rect *clip);
 void drm_fb_swab(void *dst, void *src, struct drm_framebuffer *fb,