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drm/format-helper: Add drm_fb_xrgb8888_to_xrgb2101010_toio()

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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>
Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Link: https://patchwork.freedesktop.org/patch/msgid/20211212062407.138309-3-marcan@marcan.st
This commit is contained in:
Hector Martin 2021-12-12 15:24:06 +09:00 committed by Thomas Zimmermann
parent 2f92ea2162
commit 877691b987
2 changed files with 67 additions and 0 deletions
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64
drivers/gpu/drm/drm_format_helper.c
View File

@ -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;

3
include/drm/drm_format_helper.h
View File

@ -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);
void drm_fb_xrgb8888_to_gray8(void *dst, unsigned int dst_pitch, const void *vaddr,
const struct drm_framebuffer *fb, const struct drm_rect *clip);