target/linux/bcm27xx/patches-5.4/950-0359-staging-vchiq-Use-the-old-dma-controller-for-OF-conf.patch

   1 From 6aa74a52e014952b1a144def670a03a7deb0e112 Mon Sep 17 00:00:00 2001
   2 From: Dave Stevenson <dave.stevenson@raspberrypi.org>
   3 Date: Tue, 18 Jun 2019 12:15:50 +0100
   4 Subject: [PATCH] staging: vchiq: Use the old dma controller for OF
   5  config on platform devices
   6
   7 vchiq on Pi4 is no longer under the soc node, therefore it
   8 doesn't get the dma-ranges for the VPU.
   9
  10 Switch to using the configuration of the old dma controller as
  11 that will set the dma-ranges correctly.
  12
  13 Signed-off-by: Dave Stevenson <dave.stevenson@raspberrypi.org>
  14 ---
  15  .../interface/vchiq_arm/vchiq_arm.c             | 17 ++++++++++++++---
  16  1 file changed, 14 insertions(+), 3 deletions(-)
  17
  18 --- a/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_arm.c
  19 +++ b/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_arm.c
  20 @@ -3181,6 +3181,7 @@ vchiq_register_child(struct platform_dev
  21  {
  22         struct platform_device_info pdevinfo;
  23         struct platform_device *child;
  24 +       struct device_node *np;
  25
  26         memset(&pdevinfo, 0, sizeof(pdevinfo));
  27
  28 @@ -3196,10 +3197,20 @@ vchiq_register_child(struct platform_dev
  29         }
  30
  31         /*
  32 -        * We want the dma-ranges etc to be copied from the parent VCHIQ device
  33 -        * to be passed on to the children too.
  34 +        * We want the dma-ranges etc to be copied from a device with the
  35 +        * correct dma-ranges for the VPU.
  36 +        * VCHIQ on Pi4 is now under scb which doesn't get those dma-ranges.
  37 +        * Take the "dma" node as going to be suitable as it sees the world
  38 +        * through the same eyes as the VPU.
  39          */
  40 -       of_dma_configure(&new_dev->dev, pdev->dev.of_node, true);
  41 +       np = of_find_node_by_path("dma");
  42 +       if (!np)
  43 +               np = pdev->dev.of_node;
  44 +
  45 +       of_dma_configure(&child->dev, np, true);
  46 +
  47 +       if (np != pdev->dev.of_node)
  48 +               of_node_put(np);
  49
  50         return child;
  51  }