Unverified Commit 09d6838f authored by Javier Martinez Canillas's avatar Javier Martinez Canillas
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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: default avatarThomas Zimmermann <tzimmermann@suse.de>
Signed-off-by: default avatarJavier Martinez Canillas <javierm@redhat.com>
Reviewed-by: default avatarThomas Zimmermann <tzimmermann@suse.de>
Link: https://patchwork.freedesktop.org/patch/msgid/20220927095249.1919385-1-javierm@redhat.com
parent 30b1a079

drivers/gpu/drm/solomon/ssd130x.c

+7 −0
Original line number Diff line number Diff line
@@ -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;