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drm/ssd130x: Synchronize access to dma-buf imported GEM BOs

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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>
Reviewed-by: Thomas Zimmermann <tzimmermann@suse.de>
Link: https://patchwork.freedesktop.org/patch/msgid/20220927095249.1919385-1-javierm@redhat.com
This commit is contained in:
Javier Martinez Canillas 2022-09-27 11:52:49 +02:00
parent 30b1a0797e
commit 09d6838f37
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GPG Key ID: C751E590D63F3D69
1 changed files with 7 additions and 0 deletions
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7
drivers/gpu/drm/solomon/ssd130x.c
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@ -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;