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

   1 From f7e48669bb75f3b52e9f3ce1a5d885c49b7c4712 Mon Sep 17 00:00:00 2001
   2 From: Cristian Sovaiala <cristian.sovaiala@freescale.com>
   3 Date: Thu, 4 Jun 2015 18:27:20 +0300
   4 Subject: [PATCH 32/70] arm64: Add pdev_archdata for dmamask
   5
   6 The dma_mask for a device structure is a pointer. This pointer
   7 needs to be set up before the dma mask can actually be set. Most
   8 frameworks in the kernel take care of setting this up properly but
   9 platform devices that don't follow a regular bus structure may not
  10 ever have this set. As a result, checks such as dma_capable will
  11 always return false on a raw platform device and dma_set_mask will
  12 always return -EIO. Fix this by adding a dma_mask in the
  13 platform_device archdata and setting it to be the dma_mask. Devices
  14 used in other frameworks can change this as needed.
  15
  16 Signed-off-by: Laura Abbott <lauraa@codeaurora.org>
  17 ---
  18  arch/arm64/include/asm/device.h |    1 +
  19  arch/arm64/kernel/setup.c       |    7 +++++++
  20  2 files changed, 8 insertions(+)
  21
  22 --- a/arch/arm64/include/asm/device.h
  23 +++ b/arch/arm64/include/asm/device.h
  24 @@ -25,6 +25,7 @@ struct dev_archdata {
  25  };
  26
  27  struct pdev_archdata {
  28 +       u64 dma_mask;
  29  };
  30
  31  #endif
  32 --- a/arch/arm64/kernel/setup.c
  33 +++ b/arch/arm64/kernel/setup.c
  34 @@ -44,6 +44,7 @@
  35  #include <linux/of_platform.h>
  36  #include <linux/efi.h>
  37  #include <linux/psci.h>
  38 +#include <linux/dma-mapping.h>
  39
  40  #include <asm/acpi.h>
  41  #include <asm/fixmap.h>
  42 @@ -381,3 +382,9 @@ static int __init topology_init(void)
  43         return 0;
  44  }
  45  subsys_initcall(topology_init);
  46 +
  47 +void arch_setup_pdev_archdata(struct platform_device *pdev)
  48 +{
  49 +       pdev->archdata.dma_mask = DMA_BIT_MASK(32);
  50 +       pdev->dev.dma_mask = &pdev->archdata.dma_mask;
  51 +}