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From 9f0d49445428265cd6cf0862d94bc7f3dd1304d0 Mon Sep 17 00:00:00 2001
From: Phil Elwell <phil@raspberrypi.com>
Date: Tue, 21 Jul 2020 17:34:09 +0100
Subject: [PATCH] staging: vchiq_arm: children inherit DMA config
Although it is no longer necessary for vchiq's children to have a
different DMA configuration to the parent, they do still need to
explicitly to have their DMA configuration set - to be that of the
parent.
Signed-off-by: Phil Elwell <phil@raspberrypi.com>
---
.../vc04_services/interface/vchiq_arm/vchiq_arm.c | 10 ++++++++++
1 file changed, 10 insertions(+)
--- a/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_arm.c
+++ b/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_arm.c
@@ -3205,8 +3205,18 @@ vchiq_register_child(struct platform_dev
child->dev.of_node = np;
+ /*
+ * We want the dma-ranges etc to be copied from the parent VCHIQ device
+ * to be passed on to the children without a node of their own.
+ */
+ if (!np)
+ np = pdev->dev.of_node;
+
of_dma_configure(&child->dev, np, true);
+ if (np != pdev->dev.of_node)
+ of_node_put(np);
+
return child;
}
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