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drm/format-helper: Add destination-buffer pitch to drm_fb_swab()

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Add destination-buffer pitch as argument to drm_fb_swab(). Done for
consistency with the rest of the interface.

v2:
	* update documentation (Noralf)

Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Tested-by: Noralf Trønnes <noralf@tronnes.org>
Reviewed-by: Noralf Trønnes <noralf@tronnes.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20211110103702.374-4-tzimmermann@suse.de
This commit is contained in:
Thomas Zimmermann
2021-11-10 11:36:56 +01:00
parent 27bd66dd64
commit 3e3543c8a1
4 changed files with 21 additions and 9 deletions
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21
drivers/gpu/drm/drm_format_helper.c
View File

@@ -101,6 +101,7 @@ EXPORT_SYMBOL(drm_fb_memcpy_toio);
/**
* drm_fb_swab - Swap bytes into clip buffer
* @dst: Destination buffer
* @dst_pitch: Number of bytes between two consecutive scanlines within dst
* @src: Source buffer
* @fb: DRM framebuffer
* @clip: Clip rectangle area to copy
@@ -110,21 +111,27 @@ EXPORT_SYMBOL(drm_fb_memcpy_toio);
* 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.
* is at the top-left corner.
*/
void drm_fb_swab(void *dst, void *src, struct drm_framebuffer *fb,
struct drm_rect *clip, bool cached)
void drm_fb_swab(void *dst, unsigned int dst_pitch, const void *src,
const struct drm_framebuffer *fb, const struct drm_rect *clip,
bool cached)
{
u8 cpp = fb->format->cpp[0];
size_t len = drm_rect_width(clip) * cpp;
u16 *src16, *dst16 = dst;
u32 *src32, *dst32 = dst;
const u16 *src16;
const u32 *src32;
u16 *dst16;
u32 *dst32;
unsigned int x, y;
void *buf = NULL;
if (WARN_ON_ONCE(cpp != 2 && cpp != 4))
return;
if (!dst_pitch)
dst_pitch = len;
if (!cached)
buf = kmalloc(len, GFP_KERNEL);
@@ -140,6 +147,9 @@ void drm_fb_swab(void *dst, void *src, struct drm_framebuffer *fb,
src32 = src;
}
dst16 = dst;
dst32 = dst;
for (x = clip->x1; x < clip->x2; x++) {
if (cpp == 4)
*dst32++ = swab32(*src32++);
@@ -148,6 +158,7 @@ void drm_fb_swab(void *dst, void *src, struct drm_framebuffer *fb,
}
src += fb->pitches[0];
dst += dst_pitch;
}
kfree(buf);