[PATCH 11/12] drm/format-helper: Rework XRGB8888-to-MONO conversion

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

Update XRGB8888-to-MONO 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 | 28 +++++++++++++++++++---------
 drivers/gpu/drm/solomon/ssd130x.c   |  7 ++++---
 drivers/gpu/drm/tiny/repaper.c      |  6 +++++-
 include/drm/drm_format_helper.h     |  5 +++--
 4 files changed, 31 insertions(+), 15 deletions(-)

diff --git a/drivers/gpu/drm/drm_format_helper.c
b/drivers/gpu/drm/drm_format_helper.c
index 521932fac491..d296d181659d 100644
--- a/drivers/gpu/drm/drm_format_helper.c
+++ b/drivers/gpu/drm/drm_format_helper.c
@@ -680,9 +680,9 @@ static void drm_fb_gray8_to_mono_line(void *dbuf, const void
*sbuf, unsigned int

 /**
  * drm_fb_xrgb8888_to_mono - Convert XRGB8888 to monochrome
- * @dst: monochrome destination buffer (0=black, 1=white)
- * @dst_pitch: Number of bytes between two consecutive scanlines within dst
- * @vaddr: XRGB8888 source buffer
+ * @dst: Array of monochrome destination buffers (0=black, 1=white)
+ * @dst_pitch: Array of numbers of bytes between two consecutive scanlines
within dst
+ * @vmap: Array of XRGB8888 source buffers
  * @fb: DRM framebuffer
  * @clip: Clip rectangle area to copy
  *
@@ -700,26 +700,36 @@ static void drm_fb_gray8_to_mono_line(void *dbuf, const
void *sbuf, unsigned int
  * x-coordinate that is a multiple of 8, then the caller must take care itself
  * of supplying a suitable clip rectangle.
  */
-void drm_fb_xrgb8888_to_mono(void *dst, unsigned int dst_pitch, const void
*vaddr,
-			     const struct drm_framebuffer *fb, const struct drm_rect *clip)
+void drm_fb_xrgb8888_to_mono(struct iosys_map *dst, const unsigned int
*dst_pitch,
+			     const struct iosys_map *vmap, const struct drm_framebuffer *fb,
+			     const struct drm_rect *clip)
 {
+	static const unsigned int default_dst_pitch[DRM_FORMAT_MAX_PLANES] = {
+		0, 0, 0, 0
+	};
 	unsigned int linepixels = drm_rect_width(clip);
 	unsigned int lines = drm_rect_height(clip);
 	unsigned int cpp = fb->format->cpp[0];
 	unsigned int len_src32 = linepixels * cpp;
 	struct drm_device *dev = fb->dev;
+	void *vaddr = vmap[0].vaddr;
+	unsigned int dst_pitch_0;
 	unsigned int y;
-	u8 *mono = dst, *gray8;
+	u8 *mono = dst[0].vaddr, *gray8;
 	u32 *src32;

 	if (drm_WARN_ON(dev, fb->format->format != DRM_FORMAT_XRGB8888))
 		return;

+	if (!dst_pitch)
+		dst_pitch = default_dst_pitch;
+	dst_pitch_0 = dst_pitch[0];
+
 	/*
 	 * The mono destination buffer contains 1 bit per pixel
 	 */
-	if (!dst_pitch)
-		dst_pitch = DIV_ROUND_UP(linepixels, 8);
+	if (!dst_pitch_0)
+		dst_pitch_0 = DIV_ROUND_UP(linepixels, 8);

 	/*
 	 * The cma memory is write-combined so reads are uncached.
@@ -744,7 +754,7 @@ void drm_fb_xrgb8888_to_mono(void *dst, unsigned int
dst_pitch, const void *vadd
 		drm_fb_xrgb8888_to_gray8_line(gray8, src32, linepixels);
 		drm_fb_gray8_to_mono_line(mono, gray8, linepixels);
 		vaddr += fb->pitches[0];
-		mono += dst_pitch;
+		mono += dst_pitch_0;
 	}

 	kfree(src32);
diff --git a/drivers/gpu/drm/solomon/ssd130x.c
b/drivers/gpu/drm/solomon/ssd130x.c
index 5a3e3b78cd9e..aa7329a65c98 100644
--- a/drivers/gpu/drm/solomon/ssd130x.c
+++ b/drivers/gpu/drm/solomon/ssd130x.c
@@ -537,11 +537,11 @@ static void ssd130x_clear_screen(struct ssd130x_device
*ssd130x)
 	kfree(buf);
 }

-static int ssd130x_fb_blit_rect(struct drm_framebuffer *fb, const struct
iosys_map *map,
+static int ssd130x_fb_blit_rect(struct drm_framebuffer *fb, const struct
iosys_map *vmap,
 				struct drm_rect *rect)
 {
 	struct ssd130x_device *ssd130x = drm_to_ssd130x(fb->dev);
-	void *vmap = map->vaddr; /* TODO: Use mapping abstraction properly */
+	struct iosys_map dst;
 	unsigned int dst_pitch;
 	int ret = 0;
 	u8 *buf = NULL;
@@ -555,7 +555,8 @@ static int ssd130x_fb_blit_rect(struct drm_framebuffer *fb,
const struct iosys_m
 	if (!buf)
 		return -ENOMEM;

-	drm_fb_xrgb8888_to_mono(buf, dst_pitch, vmap, fb, rect);
+	iosys_map_set_vaddr(&dst, buf);
+	drm_fb_xrgb8888_to_mono(&dst, &dst_pitch, vmap, fb, rect);

 	ssd130x_update_rect(ssd130x, buf, rect);

diff --git a/drivers/gpu/drm/tiny/repaper.c b/drivers/gpu/drm/tiny/repaper.c
index 013790c45d0a..0cdf6ab8fcc5 100644
--- a/drivers/gpu/drm/tiny/repaper.c
+++ b/drivers/gpu/drm/tiny/repaper.c
@@ -513,6 +513,8 @@ static int repaper_fb_dirty(struct drm_framebuffer *fb)
 {
 	struct drm_gem_cma_object *cma_obj = drm_fb_cma_get_gem_obj(fb, 0);
 	struct repaper_epd *epd = drm_to_epd(fb->dev);
+	unsigned int dst_pitch = 0;
+	struct iosys_map dst, vmap;
 	struct drm_rect clip;
 	int idx, ret = 0;
 	u8 *buf = NULL;
@@ -541,7 +543,9 @@ static int repaper_fb_dirty(struct drm_framebuffer *fb)
 	if (ret)
 		goto out_free;

-	drm_fb_xrgb8888_to_mono(buf, 0, cma_obj->vaddr, fb, &clip);
+	iosys_map_set_vaddr(&dst, buf);
+	iosys_map_set_vaddr(&vmap, cma_obj->vaddr);
+	drm_fb_xrgb8888_to_mono(&dst, &dst_pitch, &vmap, fb, &clip);

 	drm_gem_fb_end_cpu_access(fb, DMA_FROM_DEVICE);

diff --git a/include/drm/drm_format_helper.h b/include/drm/drm_format_helper.h
index 68087c982497..1e1d8f356cc1 100644
--- a/include/drm/drm_format_helper.h
+++ b/include/drm/drm_format_helper.h
@@ -40,7 +40,8 @@ int drm_fb_blit(struct iosys_map *dst, const unsigned int
*dst_pitch, uint32_t d
 		const struct iosys_map *vmap, const struct drm_framebuffer *fb,
 		const struct drm_rect *rect);

-void drm_fb_xrgb8888_to_mono(void *dst, unsigned int dst_pitch, const void
*src,
-			     const struct drm_framebuffer *fb, const struct drm_rect *clip);
+void drm_fb_xrgb8888_to_mono(struct iosys_map *dst, const unsigned int
*dst_pitch,
+			     const struct iosys_map *vmap, const struct drm_framebuffer *fb,
+			     const struct drm_rect *clip);

 #endif /* __LINUX_DRM_FORMAT_HELPER_H */
--
2.37.1