[PATCH v2 4/6] drm: add dstclip parameter to drm_fb_xrgb8888_to_rgb565()

[Gerd Hoffmann <kraxel@redhat.com>]

When set apply clipping logic to destination too.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
---
 include/drm/drm_fb_helper.h        | 3 ++-
 drivers/gpu/drm/drm_fb_helper.c    | 8 +++++++-
 drivers/gpu/drm/tinydrm/mipi-dbi.c | 2 +-
 3 files changed, 10 insertions(+), 3 deletions(-)

diff --git a/include/drm/drm_fb_helper.h b/include/drm/drm_fb_helper.h
index 0350c7e9d6ba..1406057e1a93 100644
--- a/include/drm/drm_fb_helper.h
+++ b/include/drm/drm_fb_helper.h
@@ -646,6 +646,7 @@ void drm_fb_memcpy(void *dst, void *vaddr, struct drm_framebuffer *fb,
 		   struct drm_rect *clip, bool dstclip);
 void drm_fb_xrgb8888_to_rgb565(u16 *dst, void *vaddr,
 			       struct drm_framebuffer *fb,
-			       struct drm_rect *clip, bool swap);
+			       struct drm_rect *clip,
+			       bool swap, bool dstclip);
 
 #endif
diff --git a/drivers/gpu/drm/drm_fb_helper.c b/drivers/gpu/drm/drm_fb_helper.c
index 087e49741094..2c9286702c3f 100644
--- a/drivers/gpu/drm/drm_fb_helper.c
+++ b/drivers/gpu/drm/drm_fb_helper.c
@@ -3388,13 +3388,15 @@ EXPORT_SYMBOL(drm_fb_memcpy);
  * @fb: DRM framebuffer
  * @clip: Clip rectangle area to copy
  * @swap: Swap bytes
+ * @dstclip: Clip destination too.
  *
  * Drivers can use this function for RGB565 devices that don't natively
  * support XRGB8888.
  */
 void drm_fb_xrgb8888_to_rgb565(u16 *dst, void *vaddr,
 			       struct drm_framebuffer *fb,
-			       struct drm_rect *clip, bool swap)
+			       struct drm_rect *clip,
+			       bool swap, bool dstclip)
 {
 	size_t len = (clip->x2 - clip->x1) * sizeof(u32);
 	unsigned int x, y;
@@ -3405,6 +3407,8 @@ void drm_fb_xrgb8888_to_rgb565(u16 *dst, void *vaddr,
 	if (!buf)
 		return;
 
+	if (dstclip)
+		dst += clip->y1 * fb->width + clip->x1;
 	for (y = clip->y1; y < clip->y2; y++) {
 		src = vaddr + (y * fb->pitches[0]);
 		src += clip->x1;
@@ -3420,6 +3424,8 @@ void drm_fb_xrgb8888_to_rgb565(u16 *dst, void *vaddr,
 			else
 				*dst++ = val16;
 		}
+		if (dstclip)
+			dst += fb->width - (clip->x2 - clip->x1);
 	}
 
 	kfree(buf);
diff --git a/drivers/gpu/drm/tinydrm/mipi-dbi.c b/drivers/gpu/drm/tinydrm/mipi-dbi.c
index cf8df5fb7494..b2d74f8707db 100644
--- a/drivers/gpu/drm/tinydrm/mipi-dbi.c
+++ b/drivers/gpu/drm/tinydrm/mipi-dbi.c
@@ -224,7 +224,7 @@ int mipi_dbi_buf_copy(void *dst, struct drm_framebuffer *fb,
 			drm_fb_memcpy(dst, src, fb, clip, false);
 		break;
 	case DRM_FORMAT_XRGB8888:
-		drm_fb_xrgb8888_to_rgb565(dst, src, fb, clip, swap);
+		drm_fb_xrgb8888_to_rgb565(dst, src, fb, clip, swap, false);
 		break;
 	default:
 		dev_err_once(fb->dev->dev, "Format is not supported: %s\n",
-- 
2.18.1