drm/msm: add support for "stolen" mem
Add support to use the VRAM carveout (if specified in dtb) for fbdev
scanout buffer. This allows drm/msm to take over a bootloader splash-
screen, and avoids corruption on screen that results if the kernel uses
memory that is still being scanned out for itself.
Signed-off-by: Rob Clark <robdclark@gmail.com>
diff --git a/drivers/gpu/drm/msm/msm_gem.h b/drivers/gpu/drm/msm/msm_gem.h
index 8fbbd05..85d481e 100644
--- a/drivers/gpu/drm/msm/msm_gem.h
+++ b/drivers/gpu/drm/msm/msm_gem.h
@@ -21,6 +21,9 @@
#include <linux/reservation.h>
#include "msm_drv.h"
+/* Additional internal-use only BO flags: */
+#define MSM_BO_STOLEN 0x10000000 /* try to use stolen/splash memory */
+
struct msm_gem_object {
struct drm_gem_object base;
@@ -59,7 +62,7 @@
struct reservation_object _resv;
/* For physically contiguous buffers. Used when we don't have
- * an IOMMU.
+ * an IOMMU. Also used for stolen/splashscreen buffer.
*/
struct drm_mm_node *vram_node;
};