Add XRGB8888 emulation support for devices that can only do RGB888.
Cc: Thomas Zimmermann tzimmermann@suse.de Reviewed-by: Daniel Vetter daniel.vetter@ffwll.ch Signed-off-by: Noralf Trønnes noralf@tronnes.org --- drivers/gpu/drm/drm_format_helper.c | 38 +++++++++++++++++++++++++++++ include/drm/drm_format_helper.h | 2 ++ 2 files changed, 40 insertions(+)
diff --git a/drivers/gpu/drm/drm_format_helper.c b/drivers/gpu/drm/drm_format_helper.c index dab4f382d469..69fde60e36b3 100644 --- a/drivers/gpu/drm/drm_format_helper.c +++ b/drivers/gpu/drm/drm_format_helper.c @@ -300,6 +300,44 @@ static void drm_fb_xrgb8888_to_rgb888_line(u8 *dbuf, u32 *sbuf, } }
+/** + * drm_fb_xrgb8888_to_rgb888 - Convert XRGB8888 to RGB888 clip buffer + * @dst: RGB888 destination buffer + * @src: XRGB8888 source buffer + * @fb: DRM framebuffer + * @clip: Clip rectangle area to copy + * + * Drivers can use this function for RGB888 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_rgb888(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_rgb888_line(dst, sbuf, width); + src += fb->pitches[0]; + dst += width * 3; + } + + kfree(sbuf); +} +EXPORT_SYMBOL(drm_fb_xrgb8888_to_rgb888); + /** * drm_fb_xrgb8888_to_rgb888_dstclip - Convert XRGB8888 to RGB888 clip buffer * @dst: RGB565 destination buffer (iomem) diff --git a/include/drm/drm_format_helper.h b/include/drm/drm_format_helper.h index d0809aff5cf8..e86925cf07b9 100644 --- a/include/drm/drm_format_helper.h +++ b/include/drm/drm_format_helper.h @@ -24,6 +24,8 @@ void drm_fb_xrgb8888_to_rgb565(void *dst, void *vaddr, void drm_fb_xrgb8888_to_rgb565_dstclip(void __iomem *dst, unsigned int dst_pitch, void *vaddr, struct drm_framebuffer *fb, struct drm_rect *clip, bool swab); +void drm_fb_xrgb8888_to_rgb888(void *dst, void *src, struct drm_framebuffer *fb, + struct drm_rect *clip); void drm_fb_xrgb8888_to_rgb888_dstclip(void __iomem *dst, unsigned int dst_pitch, void *vaddr, struct drm_framebuffer *fb, struct drm_rect *clip);