target/linux/bcm27xx/patches-5.4/950-0751-drm-vc4-Adopt-the-dma-configuration-from-the-HVS-or-.patch

   1 From 13c11f40ded81f258178936e9fa22788e59b82cf Mon Sep 17 00:00:00 2001
   2 From: Dave Stevenson <dave.stevenson@raspberrypi.com>
   3 Date: Tue, 19 May 2020 14:54:28 +0100
   4 Subject: [PATCH] drm/vc4: Adopt the dma configuration from the HVS or
   5  V3D component
   6
   7 vc4_drv isn't necessarily under the /soc node in DT as it is a
   8 virtual device, but it is the one that does the allocations.
   9 The DMA addresses are consumed by primarily the HVS or V3D, and
  10 those require VideoCore cache alias address mapping, and so will be
  11 under /soc.
  12
  13 During probe find the a suitable device node for HVS or V3D,
  14 and adopt the DMA configuration of that node.
  15
  16 Signed-off-by: Dave Stevenson <dave.stevenson@raspberrypi.com>
  17 ---
  18  drivers/gpu/drm/vc4/vc4_drv.c | 18 ++++++++++++++++++
  19  1 file changed, 18 insertions(+)
  20
  21 --- a/drivers/gpu/drm/vc4/vc4_drv.c
  22 +++ b/drivers/gpu/drm/vc4/vc4_drv.c
  23 @@ -249,6 +249,14 @@ static void vc4_match_add_drivers(struct
  24         }
  25  }
  26
  27 +const struct of_device_id vc4_dma_range_matches[] = {
  28 +       { .compatible = "brcm,bcm2835-hvs" },
  29 +       { .compatible = "brcm,bcm2835-v3d" },
  30 +       { .compatible = "brcm,cygnus-v3d" },
  31 +       { .compatible = "brcm,vc4-v3d" },
  32 +       {}
  33 +};
  34 +
  35  static int vc4_drm_bind(struct device *dev)
  36  {
  37         struct platform_device *pdev = to_platform_device(dev);
  38 @@ -269,6 +277,16 @@ static int vc4_drm_bind(struct device *d
  39                 vc4_drm_driver.driver_features &= ~DRIVER_RENDER;
  40         of_node_put(node);
  41
  42 +       node = of_find_matching_node_and_match(NULL, vc4_dma_range_matches,
  43 +                                              NULL);
  44 +       if (node) {
  45 +               ret = of_dma_configure(dev, node, true);
  46 +               of_node_put(node);
  47 +
  48 +               if (ret)
  49 +                       return ret;
  50 +       }
  51 +
  52         drm = drm_dev_alloc(&vc4_drm_driver, dev);
  53         if (IS_ERR(drm))
  54                 return PTR_ERR(drm);