This one looks a bit strange. It only changes the argument list of fimd_win_set_pixfmt() but the commit message that it actually fixes something.
The corresponding upstream commit: https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=66367461e573321f0fbb0be0391165b5a54d5fe4 With best wishes, Tobias Marek Szyprowski wrote: > This patch fixes trashed display of buffers cropped to very small width. > Even if DMA is unstable and causes tearing when changing the burst size, > it is still better than displaying a garbage. > > Signed-off-by: Marek Szyprowski <m.szyprow...@samsung.com> > --- > drivers/gpu/drm/exynos/exynos_drm_fimd.c | 24 +++++++++++------------- > 1 file changed, 11 insertions(+), 13 deletions(-) > > diff --git a/drivers/gpu/drm/exynos/exynos_drm_fimd.c > b/drivers/gpu/drm/exynos/exynos_drm_fimd.c > index 44226b2b46c7..6c04ff6432d4 100644 > --- a/drivers/gpu/drm/exynos/exynos_drm_fimd.c > +++ b/drivers/gpu/drm/exynos/exynos_drm_fimd.c > @@ -487,7 +487,7 @@ static void fimd_commit(struct exynos_drm_crtc *crtc) > > > static void fimd_win_set_pixfmt(struct fimd_context *ctx, unsigned int win, > - struct drm_framebuffer *fb) > + uint32_t pixel_format, int width) > { > unsigned long val; > > @@ -498,11 +498,11 @@ static void fimd_win_set_pixfmt(struct fimd_context > *ctx, unsigned int win, > * So the request format is ARGB8888 then change it to XRGB8888. > */ > if (ctx->driver_data->has_limited_fmt && !win) { > - if (fb->pixel_format == DRM_FORMAT_ARGB8888) > - fb->pixel_format = DRM_FORMAT_XRGB8888; > + if (pixel_format == DRM_FORMAT_ARGB8888) > + pixel_format = DRM_FORMAT_XRGB8888; > } > > - switch (fb->pixel_format) { > + switch (pixel_format) { > case DRM_FORMAT_C8: > val |= WINCON0_BPPMODE_8BPP_PALETTE; > val |= WINCONx_BURSTLEN_8WORD; > @@ -538,17 +538,15 @@ static void fimd_win_set_pixfmt(struct fimd_context > *ctx, unsigned int win, > break; > } > > - DRM_DEBUG_KMS("bpp = %d\n", fb->bits_per_pixel); > - > /* > - * In case of exynos, setting dma-burst to 16Word causes permanent > - * tearing for very small buffers, e.g. cursor buffer. Burst Mode > - * switching which is based on plane size is not recommended as > - * plane size varies alot towards the end of the screen and rapid > - * movement causes unstable DMA which results into iommu crash/tear. > + * Setting dma-burst to 16Word causes permanent tearing for very small > + * buffers, e.g. cursor buffer. Burst Mode switching which based on > + * plane size is not recommended as plane size varies alot towards the > + * end of the screen and rapid movement causes unstable DMA, but it is > + * still better to change dma-burst than displaying garbage. > */ > > - if (fb->width < MIN_FB_WIDTH_FOR_16WORD_BURST) { > + if (width < MIN_FB_WIDTH_FOR_16WORD_BURST) { > val &= ~WINCONx_BURSTLEN_MASK; > val |= WINCONx_BURSTLEN_4WORD; > } > @@ -723,7 +721,7 @@ static void fimd_update_plane(struct exynos_drm_crtc > *crtc, > DRM_DEBUG_KMS("osd size = 0x%x\n", (unsigned int)val); > } > > - fimd_win_set_pixfmt(ctx, win, fb); > + fimd_win_set_pixfmt(ctx, win, fb->pixel_format, state->src.w); > > /* hardware window 0 doesn't support color key. */ > if (win != 0) > -- To unsubscribe from this list: send the line "unsubscribe linux-samsung-soc" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
