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drm/format-helper: Add drm_fb_xrgb8888_to_rgb332() 

Add XRGB8888 emulation support for devices that can only do RGB332.

v2:
- Support Big Endian (Daniel)

Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Acked-by: Thomas Zimmermann <tzimmermann@suse.de>
Signed-off-by: Noralf Trønnes <noralf@tronnes.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20210929191201.34456-3-noralf@tronnes.org
This commit is contained in:
Noralf Trønnes 2021-09-29 21:11:57 +02:00
parent a0b1d355b9
commit cee0b7cbf1
2 changed files with 52 additions and 0 deletions
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50
drivers/gpu/drm/drm_format_helper.c
View File

@ -135,6 +135,56 @@ void drm_fb_swab(void *dst, void *src, struct drm_framebuffer *fb,
}
EXPORT_SYMBOL(drm_fb_swab);
static void drm_fb_xrgb8888_to_rgb332_line(u8 *dbuf, __le32 *sbuf, unsigned int pixels)
{
unsigned int x;
u32 pix;
for (x = 0; x < pixels; x++) {
pix = le32_to_cpu(sbuf[x]);
dbuf[x] = ((pix & 0x00e00000) >> 16) |
((pix & 0x0000e000) >> 11) |
((pix & 0x000000c0) >> 6);
}
}
/**
* drm_fb_xrgb8888_to_rgb332 - Convert XRGB8888 to RGB332 clip buffer
* @dst: RGB332 destination buffer
* @src: XRGB8888 source buffer
* @fb: DRM framebuffer
* @clip: Clip rectangle area to copy
*
* Drivers can use this function for RGB332 devices that don't natively support XRGB8888.
*
* This function does not apply clipping on dst, i.e. the destination is a small buffer
* containing the clip rect only.
*/
void drm_fb_xrgb8888_to_rgb332(void *dst, void *src, struct drm_framebuffer *fb,
struct drm_rect *clip)
{
size_t width = drm_rect_width(clip);
size_t src_len = width * sizeof(u32);
unsigned int y;
void *sbuf;
/* Use a buffer to speed up access on buffers with uncached read mapping (i.e. WC) */
sbuf = kmalloc(src_len, GFP_KERNEL);
if (!sbuf)
return;
src += clip_offset(clip, fb->pitches[0], sizeof(u32));
for (y = 0; y < drm_rect_height(clip); y++) {
memcpy(sbuf, src, src_len);
drm_fb_xrgb8888_to_rgb332_line(dst, sbuf, width);
src += fb->pitches[0];
dst += width;
}
kfree(sbuf);
}
EXPORT_SYMBOL(drm_fb_xrgb8888_to_rgb332);
static void drm_fb_xrgb8888_to_rgb565_line(u16 *dbuf, u32 *sbuf,
unsigned int pixels,
bool swab)

2
include/drm/drm_format_helper.h
View File

@ -16,6 +16,8 @@ void drm_fb_memcpy_dstclip(void __iomem *dst, unsigned int dst_pitch, void *vadd
struct drm_rect *clip);
void drm_fb_swab(void *dst, void *src, struct drm_framebuffer *fb,
struct drm_rect *clip, bool cached);
void drm_fb_xrgb8888_to_rgb332(void *dst, void *vaddr, struct drm_framebuffer *fb,
struct drm_rect *clip);
void drm_fb_xrgb8888_to_rgb565(void *dst, void *vaddr,
struct drm_framebuffer *fb,
struct drm_rect *clip, bool swab);