[PATCH 4/5] drm/mgag200: Use managed interfaces for framebuffer write combining

[Thomas Zimmermann]

Replace arch_phys_wc_add() and arch_io_reserve_memtype_wc() with
the rsp managed functions. Allows for removing the cleanup code
for memory management

Signed-off-by: Thomas Zimmermann <tzimmerm...@suse.de>
---
 drivers/gpu/drm/mgag200/mgag200_drv.h |  2 --
 drivers/gpu/drm/mgag200/mgag200_mm.c  | 35 ++++++---------------------
 2 files changed, 7 insertions(+), 30 deletions(-)

diff --git a/drivers/gpu/drm/mgag200/mgag200_drv.h 
b/drivers/gpu/drm/mgag200/mgag200_drv.h
index 196f74a0834e..4368112023f7 100644
--- a/drivers/gpu/drm/mgag200/mgag200_drv.h
+++ b/drivers/gpu/drm/mgag200/mgag200_drv.h
@@ -224,8 +224,6 @@ struct mga_device {
 
        enum mga_type                   type;
 
-       int fb_mtrr;
-
        union {
                struct {
                        long ref_clk;
diff --git a/drivers/gpu/drm/mgag200/mgag200_mm.c 
b/drivers/gpu/drm/mgag200/mgag200_mm.c
index b667371b69a4..fa996d46feed 100644
--- a/drivers/gpu/drm/mgag200/mgag200_mm.c
+++ b/drivers/gpu/drm/mgag200/mgag200_mm.c
@@ -75,26 +75,12 @@ static size_t mgag200_probe_vram(struct mga_device *mdev, 
void __iomem *mem,
        return offset - 65536;
 }
 
-static void mgag200_mm_release(struct drm_device *dev, void *ptr)
-{
-       struct mga_device *mdev = to_mga_device(dev);
-       struct pci_dev *pdev = to_pci_dev(dev->dev);
-
-       mdev->vram_fb_available = 0;
-       iounmap(mdev->vram);
-       arch_io_free_memtype_wc(pci_resource_start(pdev, 0),
-                               pci_resource_len(pdev, 0));
-       arch_phys_wc_del(mdev->fb_mtrr);
-       mdev->fb_mtrr = 0;
-}
-
 int mgag200_mm_init(struct mga_device *mdev)
 {
        struct drm_device *dev = &mdev->base;
        struct pci_dev *pdev = to_pci_dev(dev->dev);
        u8 misc;
        resource_size_t start, len;
-       int ret;
 
        WREG_ECRT(0x04, 0x00);
 
@@ -112,15 +98,13 @@ int mgag200_mm_init(struct mga_device *mdev)
                return -ENXIO;
        }
 
-       arch_io_reserve_memtype_wc(start, len);
-
-       mdev->fb_mtrr = arch_phys_wc_add(start, len);
+       /* Don't fail on errors, but performance might be reduced. */
+       devm_arch_io_reserve_memtype_wc(dev->dev, start, len);
+       devm_arch_phys_wc_add(dev->dev, start, len);
 
-       mdev->vram = ioremap(start, len);
-       if (!mdev->vram) {
-               ret = -ENOMEM;
-               goto err_arch_phys_wc_del;
-       }
+       mdev->vram = devm_ioremap(dev->dev, start, len);
+       if (!mdev->vram)
+               return -ENOMEM;
 
        mdev->mc.vram_size = mgag200_probe_vram(mdev, mdev->vram, len);
        mdev->mc.vram_base = start;
@@ -128,10 +112,5 @@ int mgag200_mm_init(struct mga_device *mdev)
 
        mdev->vram_fb_available = mdev->mc.vram_size;
 
-       return drmm_add_action_or_reset(dev, mgag200_mm_release, NULL);
-
-err_arch_phys_wc_del:
-       arch_phys_wc_del(mdev->fb_mtrr);
-       arch_io_free_memtype_wc(start, len);
-       return ret;
+       return 0;
 }
-- 
2.33.0