Hi Am 24.10.21 um 13:32 schrieb Noralf Trønnes:
Den 22.10.2021 15.28, skrev Thomas Zimmermann:Move destination-buffer clipping from all format-helper conversion functions into callers. Support destination-buffer pitch. Only distinguish between system and I/O memory, but use same logic everywhere. Simply harmonize the interface and semantics of the existing code. Not all conversion helpers support all combinations of parameters. We have to add additional features when we need them. Signed-off-by: Thomas Zimmermann <tzimmermann@xxxxxxx> ---/** * drm_fb_xrgb8888_to_gray8 - Convert XRGB8888 to grayscale * @dst: 8-bit grayscale destination buffer + * @dst_pitch: Number of bytes between two consecutive scanlines within dst * @vaddr: XRGB8888 source buffer * @fb: DRM framebuffer * @clip: Clip rectangle area to copy @@ -415,16 +417,21 @@ EXPORT_SYMBOL(drm_fb_xrgb8888_to_rgb888_dstclip); * * ITU BT.601 is used for the RGB -> luma (brightness) conversion. */ -void drm_fb_xrgb8888_to_gray8(u8 *dst, void *vaddr, struct drm_framebuffer *fb, - 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) { unsigned int len = (clip->x2 - clip->x1) * sizeof(u32); unsigned int x, y; void *buf; - u32 *src; + u8 *dst8; + u32 *src32;if (WARN_ON(fb->format->format != DRM_FORMAT_XRGB8888))return; + + if (!dst_pitch)len is source length (should really have been named src_len) which results in a kernel crash:+ dst_pitch = len;This works: dst_pitch = drm_rect_width(clip);
Fixed in the next revision. Thank you so much! Best regards Thomas
With that fixed: Tested-by: Noralf Trønnes <noralf@xxxxxxxxxxx> Reviewed-by: Noralf Trønnes <noralf@xxxxxxxxxxx>+ /* * The cma memory is write-combined so reads are uncached. * Speed up by fetching one line at a time. @@ -433,20 +440,22 @@ void drm_fb_xrgb8888_to_gray8(u8 *dst, void *vaddr, struct drm_framebuffer *fb, if (!buf) return;+ vaddr += clip_offset(clip, fb->pitches[0], sizeof(u32));for (y = clip->y1; y < clip->y2; y++) { - src = vaddr + (y * fb->pitches[0]); - src += clip->x1; - memcpy(buf, src, len); - src = buf; + dst8 = dst; + src32 = memcpy(buf, vaddr, len); for (x = clip->x1; x < clip->x2; x++) { - u8 r = (*src & 0x00ff0000) >> 16; - u8 g = (*src & 0x0000ff00) >> 8; - u8 b = *src & 0x000000ff; + u8 r = (*src32 & 0x00ff0000) >> 16; + u8 g = (*src32 & 0x0000ff00) >> 8; + u8 b = *src32 & 0x000000ff;/* ITU BT.601: Y = 0.299 R + 0.587 G + 0.114 B */- *dst++ = (3 * r + 6 * g + b) / 10; - src++; + *dst8++ = (3 * r + 6 * g + b) / 10; + src32++; } + + vaddr += fb->pitches[0]; + dst += dst_pitch; }kfree(buf);
-- Thomas Zimmermann Graphics Driver Developer SUSE Software Solutions Germany GmbH Maxfeldstr. 5, 90409 Nürnberg, Germany (HRB 36809, AG Nürnberg) Geschäftsführer: Ivo Totev
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