openwrt_lede/target/linux/layerscape/patches-4.4/3032-arm64-Add-pdev_archdata-for-dmamask.patch

From f7e48669bb75f3b52e9f3ce1a5d885c49b7c4712 Mon Sep 17 00:00:00 2001
From: Cristian Sovaiala <cristian.sovaiala@freescale.com>
Date: Thu, 4 Jun 2015 18:27:20 +0300
Subject: [PATCH 32/70] arm64: Add pdev_archdata for dmamask

The dma_mask for a device structure is a pointer. This pointer
needs to be set up before the dma mask can actually be set. Most
frameworks in the kernel take care of setting this up properly but
platform devices that don't follow a regular bus structure may not
ever have this set. As a result, checks such as dma_capable will
always return false on a raw platform device and dma_set_mask will
always return -EIO. Fix this by adding a dma_mask in the
platform_device archdata and setting it to be the dma_mask. Devices
used in other frameworks can change this as needed.

Signed-off-by: Laura Abbott <lauraa@codeaurora.org>
---
 arch/arm64/include/asm/device.h |    1 +
 arch/arm64/kernel/setup.c       |    7 +++++++
 2 files changed, 8 insertions(+)

--- a/arch/arm64/include/asm/device.h
+++ b/arch/arm64/include/asm/device.h
@@ -25,6 +25,7 @@ struct dev_archdata {
 };
 
 struct pdev_archdata {
+	u64 dma_mask;
 };
 
 #endif
--- a/arch/arm64/kernel/setup.c
+++ b/arch/arm64/kernel/setup.c
@@ -44,6 +44,7 @@
 #include <linux/of_platform.h>
 #include <linux/efi.h>
 #include <linux/psci.h>
+#include <linux/dma-mapping.h>
 
 #include <asm/acpi.h>
 #include <asm/fixmap.h>
@@ -381,3 +382,9 @@ static int __init topology_init(void)
 	return 0;
 }
 subsys_initcall(topology_init);
+
+void arch_setup_pdev_archdata(struct platform_device *pdev)
+{
+	pdev->archdata.dma_mask = DMA_BIT_MASK(32);
+	pdev->dev.dma_mask = &pdev->archdata.dma_mask;
+}