[PATCH] drm: arcpgu: Fix mmap() callback

[Jose Abreu]

Now that ARC properly supports DMA mmapping we can use the
standard CMA helper to map dumb buffers. This makes ARC PGU
works with standard DRM consumer applications like, for
example, mpv via DRM.

This fixes the use of dumb buffers.

Signed-off-by: Jose Abreu <joabreu at synopsys.com>
Fixes: 0c4250e7b15e ("drm: Add support of ARC PGU display controller")
Cc: Carlos Palminha <palminha at synopsys.com>
Cc: Alexey Brodkin <abrodkin at synopsys.com>
Cc: Daniel Vetter <daniel.vetter at ffwll.ch>
Cc: Dave Airlie <airlied at linux.ie>
---
 drivers/gpu/drm/arc/arcpgu_drv.c | 14 +-------------
 1 file changed, 1 insertion(+), 13 deletions(-)

diff --git a/drivers/gpu/drm/arc/arcpgu_drv.c b/drivers/gpu/drm/arc/arcpgu_drv.c
index 1926b20..890bc87 100644
--- a/drivers/gpu/drm/arc/arcpgu_drv.c
+++ b/drivers/gpu/drm/arc/arcpgu_drv.c
@@ -48,18 +48,6 @@ static void arcpgu_setup_mode_config(struct drm_device *drm)
 	drm->mode_config.funcs = &arcpgu_drm_modecfg_funcs;
 }
 
-static int arcpgu_gem_mmap(struct file *filp, struct vm_area_struct *vma)
-{
-	int ret;
-
-	ret = drm_gem_mmap(filp, vma);
-	if (ret)
-		return ret;
-
-	vma->vm_page_prot = pgprot_noncached(vm_get_page_prot(vma->vm_flags));
-	return 0;
-}
-
 static const struct file_operations arcpgu_drm_ops = {
 	.owner = THIS_MODULE,
 	.open = drm_open,
@@ -69,7 +57,7 @@ static int arcpgu_gem_mmap(struct file *filp, struct vm_area_struct *vma)
 	.poll = drm_poll,
 	.read = drm_read,
 	.llseek = no_llseek,
-	.mmap = arcpgu_gem_mmap,
+	.mmap = drm_gem_cma_mmap,
 };
 
 static void arcpgu_lastclose(struct drm_device *drm)
-- 
1.9.1