Now when ARC supports reserved memory areas and
per-device coherent DMA allocations we may switch ARC PGU
to use of those dedicated areas.
One of the benefits we may move frame-buffer area out
from IO Coherency aperture and so significantly
reduce IOC utilization allowing less demanding
peripherals to use all perks of IOC.
Signed-off-by: Alexey Brodkin <abrod...@synopsys.com>
Cc: Dave Airlie <airl...@gmail.com>
Cc: Daniel Vetter <dan...@ffwll.ch>
---
No changes v1 -> v2.
drivers/gpu/drm/arc/arcpgu_drv.c | 6 ++++++
1 file changed, 6 insertions(+)
diff --git a/drivers/gpu/drm/arc/arcpgu_drv.c b/drivers/gpu/drm/arc/arcpgu_drv.c
index 5b35e5db..76e187a 100644
--- a/drivers/gpu/drm/arc/arcpgu_drv.c
+++ b/drivers/gpu/drm/arc/arcpgu_drv.c
@@ -19,6 +19,7 @@
#include <drm/drm_fb_cma_helper.h>
#include <drm/drm_gem_cma_helper.h>
#include <drm/drm_atomic_helper.h>
+#include <linux/of_reserved_mem.h>
#include "arcpgu.h"
#include "arcpgu_regs.h"
@@ -135,6 +136,11 @@ static int arcpgu_load(struct drm_device *drm)
dev_info(drm->dev, "arc_pgu ID: 0x%x\n",
arc_pgu_read(arcpgu, ARCPGU_REG_ID));
+ /* Get the optional framebuffer memory resource */
+ ret = of_reserved_mem_device_init(drm->dev);
+ if (ret && ret != -ENODEV)
+ return ret;
+
if (dma_set_mask_and_coherent(drm->dev, DMA_BIT_MASK(32)))
return -ENODEV;
--
2.5.5
