From 8aeab995fa142523f376369e4ce0608df6727706 Mon Sep 17 00:00:00 2001 From: Alexey Brodkin Date: Wed, 27 Apr 2016 16:02:39 +0300 Subject: [PATCH] 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: Alexey Brodkin Cc: Dave Airlie Cc: Daniel Vetter Cc: linux-kernel@vger.kernel.org Cc: linux-snps-arc@lists.infradead.org --- 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 5b35e5dbae38..76e187a5bde0 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; -- 2.39.5