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Commit 8aeab995 authored by Alexey Brodkin's avatar Alexey Brodkin
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drm/arcpgu: use dedicated memory area for frame buffer 



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: default avatarAlexey Brodkin <abrodkin@synopsys.com>
Cc: Dave Airlie <airlied@gmail.com>
Cc: Daniel Vetter <daniel@ffwll.ch>
Cc: linux-kernel@vger.kernel.org
Cc: linux-snps-arc@lists.infradead.org
parent b89359bd

drivers/gpu/drm/arc/arcpgu_drv.c

+6 −0
Original line number Original line Diff line number Diff line
@@ -19,6 +19,7 @@ 
#include <drm/drm_fb_cma_helper.h>

#include <drm/drm_fb_cma_helper.h>

#include <drm/drm_gem_cma_helper.h>

#include <drm/drm_gem_cma_helper.h>

#include <drm/drm_atomic_helper.h>

#include <drm/drm_atomic_helper.h>

#include <linux/of_reserved_mem.h>





#include "arcpgu.h"

#include "arcpgu.h"

#include "arcpgu_regs.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",

	dev_info(drm->dev, "arc_pgu ID: 0x%x\n",

		 arc_pgu_read(arcpgu, ARCPGU_REG_ID));

		 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)))

	if (dma_set_mask_and_coherent(drm->dev, DMA_BIT_MASK(32)))

		return -ENODEV;

		return -ENODEV;