This replaces drm_fb_swab16() with drm_fb_swab() supporting 16 and 32-bit. Also make pixel line caching optional.
v2: - Bail out on cpp != 2 && 4 (Sam)
Reviewed-by: Sam Ravnborg sam@ravnborg.org Signed-off-by: Noralf Trønnes noralf@tronnes.org --- drivers/gpu/drm/drm_format_helper.c | 61 +++++++++++++++++++---------- drivers/gpu/drm/drm_mipi_dbi.c | 2 +- include/drm/drm_format_helper.h | 4 +- 3 files changed, 44 insertions(+), 23 deletions(-)
diff --git a/drivers/gpu/drm/drm_format_helper.c b/drivers/gpu/drm/drm_format_helper.c index 0897cb9aeaff..07c9999f1527 100644 --- a/drivers/gpu/drm/drm_format_helper.c +++ b/drivers/gpu/drm/drm_format_helper.c @@ -79,39 +79,60 @@ void drm_fb_memcpy_dstclip(void __iomem *dst, void *vaddr, EXPORT_SYMBOL(drm_fb_memcpy_dstclip);
/** - * drm_fb_swab16 - Swap bytes into clip buffer - * @dst: RGB565 destination buffer - * @vaddr: RGB565 source buffer + * drm_fb_swab - Swap bytes into clip buffer + * @dst: Destination buffer + * @src: Source buffer * @fb: DRM framebuffer * @clip: Clip rectangle area to copy + * @cached: Source buffer is mapped cached (eg. not write-combined) + * + * If @cached is false a temporary buffer is used to cache one pixel line at a + * time to speed up slow uncached reads. + * + * This function does not apply clipping on dst, i.e. the destination + * is a small buffer containing the clip rect only. */ -void drm_fb_swab16(u16 *dst, void *vaddr, struct drm_framebuffer *fb, - struct drm_rect *clip) +void drm_fb_swab(void *dst, void *src, struct drm_framebuffer *fb, + struct drm_rect *clip, bool cached) { - size_t len = (clip->x2 - clip->x1) * sizeof(u16); + u8 cpp = fb->format->cpp[0]; + size_t len = drm_rect_width(clip) * cpp; + u16 *src16, *dst16 = dst; + u32 *src32, *dst32 = dst; unsigned int x, y; - u16 *src, *buf; + void *buf = NULL;
- /* - * The cma memory is write-combined so reads are uncached. - * Speed up by fetching one line at a time. - */ - buf = kmalloc(len, GFP_KERNEL); - if (!buf) + if (WARN_ON_ONCE(cpp != 2 && cpp != 4)) return;
+ if (!cached) + buf = kmalloc(len, GFP_KERNEL); + + src += clip_offset(clip, fb->pitches[0], cpp); + for (y = clip->y1; y < clip->y2; y++) { - src = vaddr + (y * fb->pitches[0]); - src += clip->x1; - memcpy(buf, src, len); - src = buf; - for (x = clip->x1; x < clip->x2; x++) - *dst++ = swab16(*src++); + if (buf) { + memcpy(buf, src, len); + src16 = buf; + src32 = buf; + } else { + src16 = src; + src32 = src; + } + + for (x = clip->x1; x < clip->x2; x++) { + if (cpp == 4) + *dst32++ = swab32(*src32++); + else + *dst16++ = swab16(*src16++); + } + + src += fb->pitches[0]; }
kfree(buf); } -EXPORT_SYMBOL(drm_fb_swab16); +EXPORT_SYMBOL(drm_fb_swab);
static void drm_fb_xrgb8888_to_rgb565_line(u16 *dbuf, u32 *sbuf, unsigned int pixels, diff --git a/drivers/gpu/drm/drm_mipi_dbi.c b/drivers/gpu/drm/drm_mipi_dbi.c index 69e2b4122ce4..1447e26c0145 100644 --- a/drivers/gpu/drm/drm_mipi_dbi.c +++ b/drivers/gpu/drm/drm_mipi_dbi.c @@ -217,7 +217,7 @@ int mipi_dbi_buf_copy(void *dst, struct drm_framebuffer *fb, switch (fb->format->format) { case DRM_FORMAT_RGB565: if (swap) - drm_fb_swab16(dst, src, fb, clip); + drm_fb_swab(dst, src, fb, clip, !import_attach); else drm_fb_memcpy(dst, src, fb, clip); break; diff --git a/include/drm/drm_format_helper.h b/include/drm/drm_format_helper.h index ac220aa1a245..5f9e37032468 100644 --- a/include/drm/drm_format_helper.h +++ b/include/drm/drm_format_helper.h @@ -14,8 +14,8 @@ void drm_fb_memcpy(void *dst, void *vaddr, struct drm_framebuffer *fb, void drm_fb_memcpy_dstclip(void __iomem *dst, void *vaddr, struct drm_framebuffer *fb, struct drm_rect *clip); -void drm_fb_swab16(u16 *dst, void *vaddr, struct drm_framebuffer *fb, - 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_rgb565(void *dst, void *vaddr, struct drm_framebuffer *fb, struct drm_rect *clip, bool swab);