[PATCH 5.18 262/879] drm/format-helper: Rename drm_fb_xrgb8888_to_mono_reversed()

Greg Kroah-Hartman
2022-06-07T22:32:08Z

From: Geert Uytterhoeven <geert@linux-m68k.org>

[ Upstream commit 9b13a3fcd35fc24045d2fd0f0e13ddd8d7985b4b ]

There is no "reversed" handling in drm_fb_xrgb8888_to_mono_reversed():
the function just converts from color to grayscale, and reduces the
number of grayscale levels from 256 to 2 (i.e. brightness 0-127 is
mapped to 0, 128-255 to 1). All "reversed" handling is done in the
repaper driver, where this function originated.

Hence make this clear by renaming drm_fb_xrgb8888_to_mono_reversed() to
drm_fb_xrgb8888_to_mono(), and documenting the black/white pixel
mapping.

Fixes: bcf8b616deb87941 ("drm/format-helper: Add drm_fb_xrgb8888_to_mono_reversed()")
Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
Acked-by: Javier Martinez Canillas <javierm@redhat.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Javier Martinez Canillas <javierm@redhat.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220317081830.1211400-2-geert@linux-m68k.org
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/gpu/drm/drm_format_helper.c | 31 ++++++++++++++---------------
drivers/gpu/drm/solomon/ssd130x.c | 2 +-
drivers/gpu/drm/tiny/repaper.c | 2 +-
include/drm/drm_format_helper.h | 5 ++---
4 files changed, 19 insertions(+), 21 deletions(-)

diff --git a/drivers/gpu/drm/drm_format_helper.c b/drivers/gpu/drm/drm_format_helper.c
index bc0f49773868..5d9d0c695845 100644
--- a/drivers/gpu/drm/drm_format_helper.c
+++ b/drivers/gpu/drm/drm_format_helper.c
@@ -594,8 +594,8 @@ int drm_fb_blit_toio(void __iomem *dst, unsigned int dst_pitch, uint32_t dst_for
}
EXPORT_SYMBOL(drm_fb_blit_toio);

-static void drm_fb_gray8_to_mono_reversed_line(u8 *dst, const u8 *src, unsigned int pixels,
- unsigned int start_offset, unsigned int end_len)
+static void drm_fb_gray8_to_mono_line(u8 *dst, const u8 *src, unsigned int pixels,
+ unsigned int start_offset, unsigned int end_len)
{
unsigned int xb, i;

@@ -621,8 +621,8 @@ static void drm_fb_gray8_to_mono_reversed_line(u8 *dst, const u8 *src, unsigned
}

/**
- * drm_fb_xrgb8888_to_mono_reversed - Convert XRGB8888 to reversed monochrome
- * @dst: reversed monochrome destination buffer
+ * 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
* @src: XRGB8888 source buffer
* @fb: DRM framebuffer
@@ -633,10 +633,10 @@ static void drm_fb_gray8_to_mono_reversed_line(u8 *dst, const u8 *src, unsigned
* and use this function to convert to the native format.
*
* This function uses drm_fb_xrgb8888_to_gray8() to convert to grayscale and
- * then the result is converted from grayscale to reversed monohrome.
+ * then the result is converted from grayscale to monochrome.
*/
-void drm_fb_xrgb8888_to_mono_reversed(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(void *dst, unsigned int dst_pitch, const void *vaddr,
+ const struct drm_framebuffer *fb, const struct drm_rect *clip)
{
unsigned int linepixels = drm_rect_width(clip);
unsigned int lines = clip->y2 - clip->y1;
@@ -652,8 +652,8 @@ void drm_fb_xrgb8888_to_mono_reversed(void *dst, unsigned int dst_pitch, const v
return;

/*
- * The reversed mono destination buffer contains 1 bit per pixel
- * and destination scanlines have to be in multiple of 8 pixels.
+ * The mono destination buffer contains 1 bit per pixel and
+ * destination scanlines have to be in multiple of 8 pixels.
*/
if (!dst_pitch)
dst_pitch = DIV_ROUND_UP(linepixels, 8);
@@ -664,9 +664,9 @@ void drm_fb_xrgb8888_to_mono_reversed(void *dst, unsigned int dst_pitch, const v
* The cma memory is write-combined so reads are uncached.
* Speed up by fetching one line at a time.
*
- * Also, format conversion from XR24 to reversed monochrome
- * are done line-by-line but are converted to 8-bit grayscale
- * as an intermediate step.
+ * Also, format conversion from XR24 to monochrome are done
+ * line-by-line but are converted to 8-bit grayscale as an
+ * intermediate step.
*
* Allocate a buffer to be used for both copying from the cma
* memory and to store the intermediate grayscale line pixels.
@@ -683,7 +683,7 @@ void drm_fb_xrgb8888_to_mono_reversed(void *dst, unsigned int dst_pitch, const v
* are not aligned to multiple of 8.
*
* Calculate if the start and end pixels are not aligned and set the
- * offsets for the reversed mono line conversion function to adjust.
+ * offsets for the mono line conversion function to adjust.
*/
start_offset = clip->x1 % 8;
end_len = clip->x2 % 8;
@@ -692,12 +692,11 @@ void drm_fb_xrgb8888_to_mono_reversed(void *dst, unsigned int dst_pitch, const v
for (y = 0; y < lines; y++) {
src32 = memcpy(src32, vaddr, len_src32);
drm_fb_xrgb8888_to_gray8_line(gray8, src32, linepixels);
- drm_fb_gray8_to_mono_reversed_line(mono, gray8, dst_pitch,
- start_offset, end_len);
+ drm_fb_gray8_to_mono_line(mono, gray8, dst_pitch, start_offset, end_len);
vaddr += fb->pitches[0];
mono += dst_pitch;
}

kfree(src32);
}
-EXPORT_SYMBOL(drm_fb_xrgb8888_to_mono_reversed);
+EXPORT_SYMBOL(drm_fb_xrgb8888_to_mono);
diff --git a/drivers/gpu/drm/solomon/ssd130x.c b/drivers/gpu/drm/solomon/ssd130x.c
index d08d86ef07bc..caee851efd57 100644
--- a/drivers/gpu/drm/solomon/ssd130x.c
+++ b/drivers/gpu/drm/solomon/ssd130x.c
@@ -458,7 +458,7 @@ static int ssd130x_fb_blit_rect(struct drm_framebuffer *fb, const struct iosys_m
if (!buf)
return -ENOMEM;

- drm_fb_xrgb8888_to_mono_reversed(buf, 0, vmap, fb, rect);
+ drm_fb_xrgb8888_to_mono(buf, 0, 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 37b6bb90e46e..a096fb8b83e9 100644
--- a/drivers/gpu/drm/tiny/repaper.c
+++ b/drivers/gpu/drm/tiny/repaper.c
@@ -540,7 +540,7 @@ static int repaper_fb_dirty(struct drm_framebuffer *fb)
if (ret)
goto out_free;

- drm_fb_xrgb8888_to_mono_reversed(buf, 0, cma_obj->vaddr, fb, &clip);
+ drm_fb_xrgb8888_to_mono(buf, 0, cma_obj->vaddr, 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 0b0937c0b2f6..55145eca0782 100644
--- a/include/drm/drm_format_helper.h
+++ b/include/drm/drm_format_helper.h
@@ -43,8 +43,7 @@ int drm_fb_blit_toio(void __iomem *dst, unsigned int dst_pitch, uint32_t dst_for
const void *vmap, const struct drm_framebuffer *fb,
const struct drm_rect *rect);

-void drm_fb_xrgb8888_to_mono_reversed(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(void *dst, unsigned int dst_pitch, const void *src,
+ const struct drm_framebuffer *fb, const struct drm_rect *clip);

#endif /* __LINUX_DRM_FORMAT_HELPER_H */
--
2.35.1