target/linux/bcm27xx/patches-5.15/950-0473-staging-vchiq_arm-children-inherit-DMA-config.patch

   1 From dad69811fe68eade1b9899efd0186402f65742e0 Mon Sep 17 00:00:00 2001
   2 From: Phil Elwell <phil@raspberrypi.com>
   3 Date: Tue, 21 Jul 2020 17:34:09 +0100
   4 Subject: [PATCH] staging: vchiq_arm: children inherit DMA config
   5
   6 Although it is no longer necessary for vchiq's children to have a
   7 different DMA configuration to the parent, they do still need to
   8 explicitly to have their DMA configuration set - to be that of the
   9 parent.
  10
  11 Signed-off-by: Phil Elwell <phil@raspberrypi.com>
  12 ---
  13  .../vc04_services/interface/vchiq_arm/vchiq_arm.c      | 10 ++++++++++
  14  1 file changed, 10 insertions(+)
  15
  16 --- a/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_arm.c
  17 +++ b/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_arm.c
  18 @@ -1864,8 +1864,18 @@ vchiq_register_child(struct platform_dev
  19
  20         child->dev.of_node = np;
  21
  22 +       /*
  23 +        * We want the dma-ranges etc to be copied from the parent VCHIQ device
  24 +        * to be passed on to the children without a node of their own.
  25 +        */
  26 +       if (!np)
  27 +               np = pdev->dev.of_node;
  28 +
  29         of_dma_configure(&child->dev, np, true);
  30
  31 +       if (np != pdev->dev.of_node)
  32 +               of_node_put(np);
  33 +
  34         return child;
  35  }
  36