Am 12.12.21 um 07:24 schrieb Hector Martin:
Add XRGB8888 emulation support for devices that can only do XRGB2101010.
This is chiefly useful for simpledrm on Apple devices where the bootloader-provided framebuffer is 10-bit.
Signed-off-by: Hector Martin marcan@marcan.st
Reviewed-by: Thomas Zimmermann tzimmermann@suse.de
drivers/gpu/drm/drm_format_helper.c | 64 +++++++++++++++++++++++++++++ include/drm/drm_format_helper.h | 3 ++ 2 files changed, 67 insertions(+)
diff --git a/drivers/gpu/drm/drm_format_helper.c b/drivers/gpu/drm/drm_format_helper.c index dbe3e830096e..0f28dd2bdd72 100644 --- a/drivers/gpu/drm/drm_format_helper.c +++ b/drivers/gpu/drm/drm_format_helper.c @@ -409,6 +409,61 @@ void drm_fb_xrgb8888_to_rgb888_toio(void __iomem *dst, unsigned int dst_pitch, } EXPORT_SYMBOL(drm_fb_xrgb8888_to_rgb888_toio);
+static void drm_fb_xrgb8888_to_xrgb2101010_line(u32 *dbuf, const u32 *sbuf,
unsigned int pixels)+{
- unsigned int x;
- u32 val32;
- for (x = 0; x < pixels; x++) {
val32 = ((sbuf[x] & 0x000000FF) << 2) |((sbuf[x] & 0x0000FF00) << 4) |((sbuf[x] & 0x00FF0000) << 6);*dbuf++ = val32 | ((val32 >> 8) & 0x00300C03);- }
+}
+/**
- drm_fb_xrgb8888_to_xrgb2101010_toio - Convert XRGB8888 to XRGB2101010 clip
- buffer
- @dst: XRGB2101010 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
- Drivers can use this function for XRGB2101010 devices that don't natively
- support XRGB8888.
- */
+void drm_fb_xrgb8888_to_xrgb2101010_toio(void __iomem *dst,
unsigned int dst_pitch, const void *vaddr,const struct drm_framebuffer *fb,const struct drm_rect *clip)+{
- size_t linepixels = clip->x2 - clip->x1;
- size_t dst_len = linepixels * sizeof(u32);
- unsigned int y, lines = clip->y2 - clip->y1;
- void *dbuf;
- if (!dst_pitch)
dst_pitch = dst_len;- dbuf = kmalloc(dst_len, GFP_KERNEL);
- if (!dbuf)
return;- vaddr += clip_offset(clip, fb->pitches[0], sizeof(u32));
- for (y = 0; y < lines; y++) {
drm_fb_xrgb8888_to_xrgb2101010_line(dbuf, vaddr, linepixels);memcpy_toio(dst, dbuf, dst_len);vaddr += fb->pitches[0];dst += dst_pitch;- }
- kfree(dbuf);
+} +EXPORT_SYMBOL(drm_fb_xrgb8888_to_xrgb2101010_toio);
- /**
- drm_fb_xrgb8888_to_gray8 - Convert XRGB8888 to grayscale
- @dst: 8-bit grayscale destination buffer
@@ -500,6 +555,10 @@ int drm_fb_blit_toio(void __iomem *dst, unsigned int dst_pitch, uint32_t dst_for fb_format = DRM_FORMAT_XRGB8888; if (dst_format == DRM_FORMAT_ARGB8888) dst_format = DRM_FORMAT_XRGB8888;
if (fb_format == DRM_FORMAT_ARGB2101010)
fb_format = DRM_FORMAT_XRGB2101010;if (dst_format == DRM_FORMAT_ARGB2101010)
dst_format = DRM_FORMAT_XRGB2101010;if (dst_format == fb_format) { drm_fb_memcpy_toio(dst, dst_pitch, vmap, fb, clip);
@@ -515,6 +574,11 @@ int drm_fb_blit_toio(void __iomem *dst, unsigned int dst_pitch, uint32_t dst_for drm_fb_xrgb8888_to_rgb888_toio(dst, dst_pitch, vmap, fb, clip); return 0; }
} else if (dst_format == DRM_FORMAT_XRGB2101010) {
if (fb_format == DRM_FORMAT_XRGB8888) {drm_fb_xrgb8888_to_xrgb2101010_toio(dst, dst_pitch, vmap, fb, clip);return 0;}}
return -EINVAL;
diff --git a/include/drm/drm_format_helper.h b/include/drm/drm_format_helper.h index 97e4c3223af3..b30ed5de0a33 100644 --- a/include/drm/drm_format_helper.h +++ b/include/drm/drm_format_helper.h @@ -33,6 +33,9 @@ void drm_fb_xrgb8888_to_rgb888(void *dst, unsigned int dst_pitch, const void *sr void drm_fb_xrgb8888_to_rgb888_toio(void __iomem *dst, unsigned int dst_pitch, const void *vaddr, const struct drm_framebuffer *fb, const struct drm_rect *clip); +void drm_fb_xrgb8888_to_xrgb2101010_toio(void __iomem *dst, unsigned int dst_pitch,
const void *vaddr, const struct drm_framebuffer *fb,const struct drm_rect *clip);