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52 lines
1.6 KiB
52 lines
1.6 KiB
8 years ago
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From f7e48669bb75f3b52e9f3ce1a5d885c49b7c4712 Mon Sep 17 00:00:00 2001
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From: Cristian Sovaiala <cristian.sovaiala@freescale.com>
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Date: Thu, 4 Jun 2015 18:27:20 +0300
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Subject: [PATCH 32/70] arm64: Add pdev_archdata for dmamask
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The dma_mask for a device structure is a pointer. This pointer
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needs to be set up before the dma mask can actually be set. Most
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frameworks in the kernel take care of setting this up properly but
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platform devices that don't follow a regular bus structure may not
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ever have this set. As a result, checks such as dma_capable will
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always return false on a raw platform device and dma_set_mask will
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always return -EIO. Fix this by adding a dma_mask in the
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platform_device archdata and setting it to be the dma_mask. Devices
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used in other frameworks can change this as needed.
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Signed-off-by: Laura Abbott <lauraa@codeaurora.org>
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---
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arch/arm64/include/asm/device.h | 1 +
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arch/arm64/kernel/setup.c | 7 +++++++
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2 files changed, 8 insertions(+)
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--- a/arch/arm64/include/asm/device.h
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+++ b/arch/arm64/include/asm/device.h
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@@ -25,6 +25,7 @@ struct dev_archdata {
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};
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struct pdev_archdata {
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+ u64 dma_mask;
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};
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#endif
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--- a/arch/arm64/kernel/setup.c
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+++ b/arch/arm64/kernel/setup.c
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@@ -44,6 +44,7 @@
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#include <linux/of_platform.h>
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#include <linux/efi.h>
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#include <linux/psci.h>
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+#include <linux/dma-mapping.h>
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#include <asm/acpi.h>
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#include <asm/fixmap.h>
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@@ -381,3 +382,9 @@ static int __init topology_init(void)
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return 0;
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}
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subsys_initcall(topology_init);
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+
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+void arch_setup_pdev_archdata(struct platform_device *pdev)
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+{
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+ pdev->archdata.dma_mask = DMA_BIT_MASK(32);
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+ pdev->dev.dma_mask = &pdev->archdata.dma_mask;
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+}
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