[PATCH] ath9k: add a quirk to set use_msi automatically

[AceLan Kao]

Some platform(BIOS) blocks legacy interrupts (INTx), and only allows MSI
for WLAN device. So adding a quirk to list those machines and set
use_msi automatically.
Adding the following platforms to the quirk.
   Dell Inspiron 24-3460
   Dell Inspiron 3472
   Dell Inspiron 14-3473
   Dell Vostro 3262
   Dell Vostro 15-3572

Signed-off-by: AceLan Kao <acelan....@canonical.com>
---
 drivers/net/wireless/ath/ath9k/init.c | 53 +++++++++++++++++++++++++++++++++++
 1 file changed, 53 insertions(+)

diff --git a/drivers/net/wireless/ath/ath9k/init.c 
b/drivers/net/wireless/ath/ath9k/init.c
index 43adead..e479fae 100644
--- a/drivers/net/wireless/ath/ath9k/init.c
+++ b/drivers/net/wireless/ath/ath9k/init.c
@@ -23,6 +23,7 @@
 #include <linux/of.h>
 #include <linux/of_net.h>
 #include <linux/relay.h>
+#include <linux/dmi.h>
 #include <net/ieee80211_radiotap.h>
 
 #include "ath9k.h"
@@ -96,6 +97,56 @@ static const struct ieee80211_tpt_blink ath9k_tpt_blink[] = {
 };
 #endif
 
+static int __init set_use_msi(const struct dmi_system_id *dmi)
+{
+       ath9k_use_msi = 1;
+       return 1;
+}
+
+static const struct dmi_system_id ath9k_quirks[] __initconst = {
+       {
+               .callback = set_use_msi,
+               .ident = "Dell Inspiron 24-3460",
+               .matches = {
+                       DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
+                       DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 24-3460"),
+               },
+       },
+       {
+               .callback = set_use_msi,
+               .ident = "Dell Vostro 3262",
+               .matches = {
+                       DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
+                       DMI_MATCH(DMI_PRODUCT_NAME, "Vostro 3262"),
+               },
+       },
+       {
+               .callback = set_use_msi,
+               .ident = "Dell Inspiron 3472",
+               .matches = {
+                       DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
+                       DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 3472"),
+               },
+       },
+       {
+               .callback = set_use_msi,
+               .ident = "Dell Vostro 15-3572",
+               .matches = {
+                       DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
+                       DMI_MATCH(DMI_PRODUCT_NAME, "Vostro 15-3572"),
+               },
+       },
+       {
+               .callback = set_use_msi,
+               .ident = "Dell Inspiron 14-3473",
+               .matches = {
+                       DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
+                       DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 14-3473"),
+               },
+       },
+       {}
+};
+
 static void ath9k_deinit_softc(struct ath_softc *sc);
 
 static void ath9k_op_ps_wakeup(struct ath_common *common)
@@ -1104,6 +1155,8 @@ static int __init ath9k_init(void)
                goto err_pci_exit;
        }
 
+       dmi_check_system(ath9k_quirks);
+
        return 0;
 
  err_pci_exit:
-- 
2.7.4