brcmfmac: prohibit ACPI power management for brcmfmac driver

ACPI will manage WiFi chip's power state during suspend/resume
process on some tablet platforms(such as ASUS T100TA). This is
not supported by brcmfmac driver now, and the context of WiFi
chip will be damaged after resume. This patch informs ACPI not
to manage WiFi chip's power state.

Signed-off-by: Zhonghui Fu <zhonghui.fu@linux.intel.com>
Acked-by: Arend van Spriel <arend@broadcom.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>

diff --git a/drivers/net/wireless/brcm80211/brcmfmac/bcmsdh.c b/drivers/net/wireless/brcm80211/brcmfmac/bcmsdh.c
index 8a69544485a93d7bf7ac87452fd2dffb407382ab..b0d0ff5d82c0966265baff054093c2073ca55f02 100644 (file)
--- a/drivers/net/wireless/brcm80211/brcmfmac/bcmsdh.c
+++ b/drivers/net/wireless/brcm80211/brcmfmac/bcmsdh.c
@@ -33,6 +33,7 @@
 #include <linux/suspend.h>
 #include <linux/errno.h>
 #include <linux/module.h>
+#include <linux/acpi.h>
 #include <net/cfg80211.h>
 
 #include <defs.h>
@@ -1122,6 +1123,8 @@ static int brcmf_ops_sdio_probe(struct sdio_func *func,
        int err;
        struct brcmf_sdio_dev *sdiodev;
        struct brcmf_bus *bus_if;
+       struct device *dev;
+       struct acpi_device *adev;
 
        brcmf_dbg(SDIO, "Enter\n");
        brcmf_dbg(SDIO, "Class=%x\n", func->class);
@@ -1129,6 +1132,12 @@ static int brcmf_ops_sdio_probe(struct sdio_func *func,
        brcmf_dbg(SDIO, "sdio device ID: 0x%04x\n", func->device);
        brcmf_dbg(SDIO, "Function#: %d\n", func->num);
 
+       /* prohibit ACPI power management for this device */
+       dev = &func->dev;
+       adev = ACPI_COMPANION(dev);
+       if (adev)
+               adev->flags.power_manageable = 0;
+
        /* Consume func num 1 but dont do anything with it. */
        if (func->num == 1)
                return 0;