target/linux/layerscape/patches-5.4/701-net-0147-bus-fsl-mc-Allocate-mc-portal-from-root-dprc-contain.patch

   1 From 703972946a42cf1f83bf50cf389d618d61b69500 Mon Sep 17 00:00:00 2001
   2 From: Bharat Bhushan <Bharat.Bhushan@nxp.com>
   3 Date: Mon, 10 Dec 2018 14:42:51 +0530
   4 Subject: [PATCH] bus: fsl-mc: Allocate mc-portal from root dprc container
   5
   6 Root dprc container have allocate-able mc-portals which
   7 can be allocated by kernel drivers.
   8
   9 As per current design mc-portal is allocated from parent
  10 dprc container if requesting device is not root-dprc.
  11 This works fine if the requesting device is child of
  12 root dprc container, because their parent is root-dprc
  13 container. But if request device is grandchild of root
  14 dprc container then it tries to allocate from it's parent
  15 root dprc-container and it fails.
  16
  17 Signed-off-by: Ioana Ciornei <ioana.ciornei@nxp.com>
  18 Signed-off-by: Bharat Bhushan <Bharat.Bhushan@nxp.com>
  19 ---
  20  drivers/bus/fsl-mc/mc-io.c | 10 ++++++----
  21  1 file changed, 6 insertions(+), 4 deletions(-)
  22
  23 --- a/drivers/bus/fsl-mc/mc-io.c
  24 +++ b/drivers/bus/fsl-mc/mc-io.c
  25 @@ -174,14 +174,16 @@ int __must_check fsl_mc_portal_allocate(
  26         int error = -EINVAL;
  27         struct fsl_mc_resource *resource = NULL;
  28         struct fsl_mc_io *mc_io = NULL;
  29 +       struct device *root_dprc_dev;
  30
  31 -       if (mc_dev->flags & FSL_MC_IS_DPRC) {
  32 +       if (fsl_mc_is_root_dprc(&mc_dev->dev)) {
  33                 mc_bus_dev = mc_dev;
  34         } else {
  35 -               if (!dev_is_fsl_mc(mc_dev->dev.parent))
  36 -                       return error;
  37 +               fsl_mc_get_root_dprc(&mc_dev->dev, &root_dprc_dev);
  38 +               if (WARN_ON(!root_dprc_dev))
  39 +                       return -EINVAL;
  40
  41 -               mc_bus_dev = to_fsl_mc_device(mc_dev->dev.parent);
  42 +               mc_bus_dev = to_fsl_mc_device(root_dprc_dev);
  43         }
  44
  45         mc_bus = to_fsl_mc_bus(mc_bus_dev);