package/kernel/mac80211/patches/366-brcmfmac-prohibit-ACPI-power-management-for-brcmfmac.patch

   1 From: "Fu, Zhonghui" <zhonghui.fu@linux.intel.com>
   2 Date: Mon, 11 May 2015 10:41:32 +0800
   3 Subject: [PATCH] brcmfmac: prohibit ACPI power management for brcmfmac driver
   4
   5 ACPI will manage WiFi chip's power state during suspend/resume
   6 process on some tablet platforms(such as ASUS T100TA). This is
   7 not supported by brcmfmac driver now, and the context of WiFi
   8 chip will be damaged after resume. This patch informs ACPI not
   9 to manage WiFi chip's power state.
  10
  11 Signed-off-by: Zhonghui Fu <zhonghui.fu@linux.intel.com>
  12 Acked-by: Arend van Spriel <arend@broadcom.com>
  13 Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
  14 ---
  15
  16 --- a/drivers/net/wireless/brcm80211/brcmfmac/bcmsdh.c
  17 +++ b/drivers/net/wireless/brcm80211/brcmfmac/bcmsdh.c
  18 @@ -33,6 +33,7 @@
  19  #include <linux/suspend.h>
  20  #include <linux/errno.h>
  21  #include <linux/module.h>
  22 +#include <linux/acpi.h>
  23  #include <net/cfg80211.h>
  24
  25  #include <defs.h>
  26 @@ -1122,6 +1123,8 @@ static int brcmf_ops_sdio_probe(struct s
  27         int err;
  28         struct brcmf_sdio_dev *sdiodev;
  29         struct brcmf_bus *bus_if;
  30 +       struct device *dev;
  31 +       struct acpi_device *adev;
  32
  33         brcmf_dbg(SDIO, "Enter\n");
  34         brcmf_dbg(SDIO, "Class=%x\n", func->class);
  35 @@ -1129,6 +1132,12 @@ static int brcmf_ops_sdio_probe(struct s
  36         brcmf_dbg(SDIO, "sdio device ID: 0x%04x\n", func->device);
  37         brcmf_dbg(SDIO, "Function#: %d\n", func->num);
  38
  39 +       /* prohibit ACPI power management for this device */
  40 +       dev = &func->dev;
  41 +       adev = ACPI_COMPANION(dev);
  42 +       if (adev)
  43 +               adev->flags.power_manageable = 0;
  44 +
  45         /* Consume func num 1 but dont do anything with it. */
  46         if (func->num == 1)
  47                 return 0;