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

From 703972946a42cf1f83bf50cf389d618d61b69500 Mon Sep 17 00:00:00 2001
From: Bharat Bhushan <Bharat.Bhushan@nxp.com>
Date: Mon, 10 Dec 2018 14:42:51 +0530
Subject: [PATCH] bus: fsl-mc: Allocate mc-portal from root dprc container

Root dprc container have allocate-able mc-portals which
can be allocated by kernel drivers.

As per current design mc-portal is allocated from parent
dprc container if requesting device is not root-dprc.
This works fine if the requesting device is child of
root dprc container, because their parent is root-dprc
container. But if request device is grandchild of root
dprc container then it tries to allocate from it's parent
root dprc-container and it fails.

Signed-off-by: Ioana Ciornei <ioana.ciornei@nxp.com>
Signed-off-by: Bharat Bhushan <Bharat.Bhushan@nxp.com>
---
 drivers/bus/fsl-mc/mc-io.c | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

--- a/drivers/bus/fsl-mc/mc-io.c
+++ b/drivers/bus/fsl-mc/mc-io.c
@@ -174,14 +174,16 @@ int __must_check fsl_mc_portal_allocate(
 	int error = -EINVAL;
 	struct fsl_mc_resource *resource = NULL;
 	struct fsl_mc_io *mc_io = NULL;
+	struct device *root_dprc_dev;
 
-	if (mc_dev->flags & FSL_MC_IS_DPRC) {
+	if (fsl_mc_is_root_dprc(&mc_dev->dev)) {
 		mc_bus_dev = mc_dev;
 	} else {
-		if (!dev_is_fsl_mc(mc_dev->dev.parent))
-			return error;
+		fsl_mc_get_root_dprc(&mc_dev->dev, &root_dprc_dev);
+		if (WARN_ON(!root_dprc_dev))
+			return -EINVAL;
 
-		mc_bus_dev = to_fsl_mc_device(mc_dev->dev.parent);
+		mc_bus_dev = to_fsl_mc_device(root_dprc_dev);
 	}
 
 	mc_bus = to_fsl_mc_bus(mc_bus_dev);