[PATCH 05/12] drm/format-helper: Rework XRGB8888-to-RGBG565 conversion

Thomas Zimmermann
Wed, 27 Jul 2022 11:33:05 -0000

Update XRGB8888-to-RGB565 conversion to support struct iosys_map
and convert all users. Although these are single-plane color formats,
the new interface supports multi-plane formats for consistency with
drm_fb_blit().

Signed-off-by: Thomas Zimmermann <tzimmermann at suse.de>
---
 drivers/gpu/drm/drm_format_helper.c | 59 +++++++++++------------------
 drivers/gpu/drm/drm_mipi_dbi.c      |  4 +-
 drivers/gpu/drm/gud/gud_pipe.c      |  3 +-
 drivers/gpu/drm/tiny/cirrus.c       |  3 +-
 include/drm/drm_format_helper.h     |  9 ++---
 5 files changed, 30 insertions(+), 48 deletions(-)

diff --git a/drivers/gpu/drm/drm_format_helper.c
b/drivers/gpu/drm/drm_format_helper.c
index 2b5c3746ff4a..8bf5655f5ce0 100644
--- a/drivers/gpu/drm/drm_format_helper.c
+++ b/drivers/gpu/drm/drm_format_helper.c
@@ -330,9 +330,9 @@ static void drm_fb_xrgb8888_to_rgb565_swab_line(void *dbuf,
const void *sbuf,

 /**
  * drm_fb_xrgb8888_to_rgb565 - Convert XRGB8888 to RGB565 clip buffer
- * @dst: RGB565 destination buffer
- * @dst_pitch: Number of bytes between two consecutive scanlines within dst
- * @vaddr: XRGB8888 source buffer
+ * @dst: Array of RGB565 destination buffers
+ * @dst_pitch: Array of numbers of bytes between two consecutive scanlines
within dst
+ * @vmap: Array of XRGB8888 source buffer
  * @fb: DRM framebuffer
  * @clip: Clip rectangle area to copy
  * @swab: Swap bytes
@@ -340,43 +340,31 @@ static void drm_fb_xrgb8888_to_rgb565_swab_line(void
*dbuf, const void *sbuf,
  * Drivers can use this function for RGB565 devices that don't natively
  * support XRGB8888.
  */
-void drm_fb_xrgb8888_to_rgb565(void *dst, unsigned int dst_pitch, const void
*vaddr,
-			       const struct drm_framebuffer *fb, const struct drm_rect *clip,
-			       bool swab)
+void drm_fb_xrgb8888_to_rgb565(struct iosys_map *dst, const unsigned int
*dst_pitch,
+			       const struct iosys_map *vmap, const struct drm_framebuffer *fb,
+			       const struct drm_rect *clip, bool swab)
 {
+	static const unsigned int default_dst_pitch[DRM_FORMAT_MAX_PLANES] = {
+		0, 0, 0, 0
+	};
+	void (*xfrm_line)(void *dbuf, const void *sbuf, unsigned int npixels);
+
 	if (swab)
-		drm_fb_xfrm(dst, dst_pitch, 2, vaddr, fb, clip, false,
-			    drm_fb_xrgb8888_to_rgb565_swab_line);
+		xfrm_line = drm_fb_xrgb8888_to_rgb565_swab_line;
 	else
-		drm_fb_xfrm(dst, dst_pitch, 2, vaddr, fb, clip, false,
-			    drm_fb_xrgb8888_to_rgb565_line);
-}
-EXPORT_SYMBOL(drm_fb_xrgb8888_to_rgb565);
+		xfrm_line = drm_fb_xrgb8888_to_rgb565_line;

-/**
- * drm_fb_xrgb8888_to_rgb565_toio - Convert XRGB8888 to RGB565 clip buffer
- * @dst: RGB565 destination buffer (iomem)
- * @dst_pitch: Number of bytes between two consecutive scanlines within dst
- * @vaddr: XRGB8888 source buffer
- * @fb: DRM framebuffer
- * @clip: Clip rectangle area to copy
- * @swab: Swap bytes
- *
- * Drivers can use this function for RGB565 devices that don't natively
- * support XRGB8888.
- */
-void drm_fb_xrgb8888_to_rgb565_toio(void __iomem *dst, unsigned int dst_pitch,
-				    const void *vaddr, const struct drm_framebuffer *fb,
-				    const struct drm_rect *clip, bool swab)
-{
-	if (swab)
-		drm_fb_xfrm_toio(dst, dst_pitch, 2, vaddr, fb, clip, false,
-				 drm_fb_xrgb8888_to_rgb565_swab_line);
+	if (!dst_pitch)
+		dst_pitch = default_dst_pitch;
+
+	if (dst[0].is_iomem)
+		drm_fb_xfrm_toio(dst[0].vaddr_iomem, dst_pitch[0], 2, vmap[0].vaddr, fb,
clip,
+				 false, xfrm_line);
 	else
-		drm_fb_xfrm_toio(dst, dst_pitch, 2, vaddr, fb, clip, false,
-				 drm_fb_xrgb8888_to_rgb565_line);
+		drm_fb_xfrm(dst[0].vaddr, dst_pitch[0], 2, vmap[0].vaddr, fb, clip,
+			    false, xfrm_line);
 }
-EXPORT_SYMBOL(drm_fb_xrgb8888_to_rgb565_toio);
+EXPORT_SYMBOL(drm_fb_xrgb8888_to_rgb565);

 static void drm_fb_xrgb8888_to_rgb888_line(void *dbuf, const void *sbuf,
unsigned int pixels)
 {
@@ -605,8 +593,7 @@ int drm_fb_blit(struct iosys_map *dst, const unsigned int
*dst_pitch, uint32_t d

 	} else if (dst_format == DRM_FORMAT_RGB565) {
 		if (fb_format == DRM_FORMAT_XRGB8888) {
-			drm_fb_xrgb8888_to_rgb565_toio(dst[0].vaddr_iomem, dst_pitch[0],
-						       vmap[0].vaddr, fb, clip, false);
+			drm_fb_xrgb8888_to_rgb565(dst, dst_pitch, vmap, fb, clip, false);
 			return 0;
 		}
 	} else if (dst_format == DRM_FORMAT_RGB888) {
diff --git a/drivers/gpu/drm/drm_mipi_dbi.c b/drivers/gpu/drm/drm_mipi_dbi.c
index 973a75585cad..d0bdbcb96705 100644
--- a/drivers/gpu/drm/drm_mipi_dbi.c
+++ b/drivers/gpu/drm/drm_mipi_dbi.c
@@ -206,7 +206,6 @@ int mipi_dbi_buf_copy(void *dst, struct drm_framebuffer *fb,
 	struct iosys_map map[DRM_FORMAT_MAX_PLANES];
 	struct iosys_map data[DRM_FORMAT_MAX_PLANES];
 	struct iosys_map dst_map = IOSYS_MAP_INIT_VADDR(dst);
-	void *src;
 	int ret;

 	ret = drm_gem_fb_begin_cpu_access(fb, DMA_FROM_DEVICE);
@@ -216,7 +215,6 @@ int mipi_dbi_buf_copy(void *dst, struct drm_framebuffer *fb,
 	ret = drm_gem_fb_vmap(fb, map, data);
 	if (ret)
 		goto out_drm_gem_fb_end_cpu_access;
-	src = data[0].vaddr; /* TODO: Use mapping abstraction properly */

 	switch (fb->format->format) {
 	case DRM_FORMAT_RGB565:
@@ -226,7 +224,7 @@ int mipi_dbi_buf_copy(void *dst, struct drm_framebuffer *fb,
 			drm_fb_memcpy(&dst_map, NULL, data, fb, clip);
 		break;
 	case DRM_FORMAT_XRGB8888:
-		drm_fb_xrgb8888_to_rgb565(dst, 0, src, fb, clip, swap);
+		drm_fb_xrgb8888_to_rgb565(&dst_map, NULL, data, fb, clip, swap);
 		break;
 	default:
 		drm_err_once(fb->dev, "Format is not supported: %p4cc\n",
diff --git a/drivers/gpu/drm/gud/gud_pipe.c b/drivers/gpu/drm/gud/gud_pipe.c
index 426a3ae6cc50..a43eb6645352 100644
--- a/drivers/gpu/drm/gud/gud_pipe.c
+++ b/drivers/gpu/drm/gud/gud_pipe.c
@@ -198,7 +198,8 @@ static int gud_prep_flush(struct gud_device *gdrm, struct
drm_framebuffer *fb,
 		} else if (format->format == DRM_FORMAT_RGB332) {
 			drm_fb_xrgb8888_to_rgb332(&dst, NULL, map_data, fb, rect);
 		} else if (format->format == DRM_FORMAT_RGB565) {
-			drm_fb_xrgb8888_to_rgb565(buf, 0, vaddr, fb, rect, gud_is_big_endian());
+			drm_fb_xrgb8888_to_rgb565(&dst, NULL, map_data, fb, rect,
+						  gud_is_big_endian());
 		} else if (format->format == DRM_FORMAT_RGB888) {
 			drm_fb_xrgb8888_to_rgb888(buf, 0, vaddr, fb, rect);
 		} else {
diff --git a/drivers/gpu/drm/tiny/cirrus.c b/drivers/gpu/drm/tiny/cirrus.c
index 73fb9f63d227..9cd398e4700b 100644
--- a/drivers/gpu/drm/tiny/cirrus.c
+++ b/drivers/gpu/drm/tiny/cirrus.c
@@ -335,8 +335,7 @@ static int cirrus_fb_blit_rect(struct drm_framebuffer *fb,

 	} else if (fb->format->cpp[0] == 4 && cirrus->cpp == 2) {
 		iosys_map_incr(&dst, drm_fb_clip_offset(cirrus->pitch, fb->format,
rect));
-		drm_fb_xrgb8888_to_rgb565_toio(dst.vaddr_iomem, cirrus->pitch, vaddr, fb,
rect,
-					       false);
+		drm_fb_xrgb8888_to_rgb565(&dst, &cirrus->pitch, vmap, fb, rect,
false);

 	} else if (fb->format->cpp[0] == 4 && cirrus->cpp == 3) {
 		iosys_map_incr(&dst, drm_fb_clip_offset(cirrus->pitch, fb->format,
rect));
diff --git a/include/drm/drm_format_helper.h b/include/drm/drm_format_helper.h
index 3c28f099e3ed..9f1d45d7ce84 100644
--- a/include/drm/drm_format_helper.h
+++ b/include/drm/drm_format_helper.h
@@ -23,12 +23,9 @@ void drm_fb_swab(struct iosys_map *dst, const unsigned int
*dst_pitch,
 void drm_fb_xrgb8888_to_rgb332(struct iosys_map *dst, const unsigned int
*dst_pitch,
 			       const struct iosys_map *vmap, const struct drm_framebuffer *fb,
 			       const struct drm_rect *clip);
-void drm_fb_xrgb8888_to_rgb565(void *dst, unsigned int dst_pitch, const void
*vaddr,
-			       const struct drm_framebuffer *fb, const struct drm_rect *clip,
-			       bool swab);
-void drm_fb_xrgb8888_to_rgb565_toio(void __iomem *dst, unsigned int dst_pitch,
-				    const void *vaddr, const struct drm_framebuffer *fb,
-				    const struct drm_rect *clip, bool swab);
+void drm_fb_xrgb8888_to_rgb565(struct iosys_map *dst, const unsigned int
*dst_pitch,
+			       const struct iosys_map *vmap, const struct drm_framebuffer *fb,
+			       const struct drm_rect *clip, bool swab);
 void drm_fb_xrgb8888_to_rgb888(void *dst, unsigned int dst_pitch, const void
*src,
 			       const struct drm_framebuffer *fb, const struct drm_rect *clip);
 void drm_fb_xrgb8888_to_rgb888_toio(void __iomem *dst, unsigned int dst_pitch,
--
2.37.1