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Subject[PATCH] drm/ssd130x: Synchronize access to dma-buf imported GEM BOs
Date
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 <tzimmermann@suse.de>
Signed-off-by: Javier Martinez Canillas <javierm@redhat.com>
---

drivers/gpu/drm/solomon/ssd130x.c | 7 +++++++
1 file changed, 7 insertions(+)

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;
--
2.37.3
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