950-0298-staging-vchiq_arm-Set-up-dma-ranges-on-child-devices.patch

From f03f60a51efdf7fbc1f7d2c5b120a7de93ea6d9e Mon Sep 17 00:00:00 2001
From: Dave Stevenson <dave.stevenson@raspberrypi.org>
Date: Tue, 29 Jan 2019 16:13:25 +0000
Subject: [PATCH] staging: vchiq_arm: Set up dma ranges on child
 devices

The VCHIQ driver now loads the audio, camera, codec, and vc-sm
drivers as platform drivers. However they were not being given
the correct DMA configuration.

Call of_dma_configure with the parent (VCHIQ) parameters to be
inherited by the child.

Signed-off-by: Dave Stevenson <dave.stevenson@raspberrypi.org>
---
 .../vc04_services/interface/vchiq_arm/vchiq_arm.c   | 13 ++++++++++++-
 1 file changed, 12 insertions(+), 1 deletion(-)

--- a/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_arm.c
+++ b/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_arm.c
@@ -3585,6 +3585,7 @@ static struct platform_device *
 vchiq_register_child(struct platform_device *pdev, const char *name)
 {
 	struct platform_device_info pdevinfo;
+	struct platform_device *new_dev;
 
 	memset(&pdevinfo, 0, sizeof(pdevinfo));
 
@@ -3593,7 +3594,17 @@ vchiq_register_child(struct platform_dev
 	pdevinfo.id = PLATFORM_DEVID_NONE;
 	pdevinfo.dma_mask = DMA_BIT_MASK(32);
 
-	return platform_device_register_full(&pdevinfo);
+	new_dev = platform_device_register_full(&pdevinfo);
+	if (!new_dev)
+		return NULL;
+
+	/*
+	 * We want the dma-ranges etc to be copied from the parent VCHIQ device
+	 * to be passed on to the children too.
+	 */
+	of_dma_configure(&new_dev->dev, pdev->dev.of_node, true);
+
+	return new_dev;
 }
 
 static int vchiq_probe(struct platform_device *pdev)