From 09d6838f377e273e112bb20eba1e569c62e1ceb4 Mon Sep 17 00:00:00 2001 From: Javier Martinez Canillas Date: Tue, 27 Sep 2022 11:52:49 +0200 Subject: drm/ssd130x: Synchronize access to dma-buf imported GEM BOs Synchronize CPU access to GEM BOs with other drivers when updating the screen buffer. Imported DMA buffers might otherwise contain stale data. Suggested-by: Thomas Zimmermann Signed-off-by: Javier Martinez Canillas Reviewed-by: Thomas Zimmermann Link: https://patchwork.freedesktop.org/patch/msgid/20220927095249.1919385-1-javierm@redhat.com --- drivers/gpu/drm/solomon/ssd130x.c | 7 +++++++ 1 file changed, 7 insertions(+) (limited to 'drivers/gpu/drm/solomon') diff --git a/drivers/gpu/drm/solomon/ssd130x.c b/drivers/gpu/drm/solomon/ssd130x.c index a537692100d1..bc41a5ae810a 100644 --- a/drivers/gpu/drm/solomon/ssd130x.c +++ b/drivers/gpu/drm/solomon/ssd130x.c @@ -555,11 +555,18 @@ static int ssd130x_fb_blit_rect(struct drm_framebuffer *fb, const struct iosys_m if (!buf) return -ENOMEM; + ret = drm_gem_fb_begin_cpu_access(fb, DMA_FROM_DEVICE); + if (ret) + goto out_free; + iosys_map_set_vaddr(&dst, buf); drm_fb_xrgb8888_to_mono(&dst, &dst_pitch, vmap, fb, rect); + drm_gem_fb_end_cpu_access(fb, DMA_FROM_DEVICE); + ssd130x_update_rect(ssd130x, buf, rect); +out_free: kfree(buf); return ret; -- cgit v1.2.3