drm/tegra: Store pointer to vmap'ed framebuffer in screen_buffer

Tegra uses DMA-able memory, which has to be acessed with CPU ops
for system-memory. Store the framebuffer's vmap address in struct
fb_info.screen_buffer. The currently used field 'screen_base' is
for I/O memory.

Suggested-by: Thierry Reding <[email protected]>
Signed-off-by: Thomas Zimmermann <[email protected]>
Cc: Thierry Reding <[email protected]>
Cc: Mikko Perttunen <[email protected]>
Reviewed-by: Javier Martinez Canillas <[email protected]>
Acked-by: Thierry Reding <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

Author: Thomas Zimmermann

drivers/gpu/drm/tegra/fbdev.c

@@ -133,7 +133,7 @@ static int tegra_fbdev_probe(struct drm_fb_helper *helper,
 	}
 
 	info->flags |= FBINFO_VIRTFB;
-	info->screen_base = (void __iomem *)bo->vaddr + offset;
+	info->screen_buffer = bo->vaddr + offset;
 	info->screen_size = size;
 	info->fix.smem_start = (unsigned long)(bo->iova + offset);
 	info->fix.smem_len = size;