From mboxrd@z Thu Jan 1 00:00:00 1970 From: Alexey.Brodkin@synopsys.com (Alexey Brodkin) Date: Thu, 28 Apr 2016 17:19:55 +0300 Subject: [PATCH 1/2 v2] drm/arcpgu: use dedicated memory area for frame buffer In-Reply-To: <1461853196-15599-1-git-send-email-abrodkin@synopsys.com> References: <1461853196-15599-1-git-send-email-abrodkin@synopsys.com> List-ID: Message-ID: <1461853196-15599-2-git-send-email-abrodkin@synopsys.com> To: linux-snps-arc@lists.infradead.org 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 Cc: Dave Airlie Cc: Daniel Vetter --- 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 #include #include +#include #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