libertas: fix power save issue in libertas_sdio module

The problem: "iwconfig ethX power on" returns error

The cause: "ps_supported" flag was never set for SD8385/8686

The fix: check firmware capabilities returned by GET_HW_SPEC command.
Set "ps_supported" to 1 if FW_CAPINFO_PS bit is on. This fix applies
to SDIO interface only.

Signed-off-by: Bing Zhao <bzhao@marvell.com>
Acked-by: Dan Williams <dcbw@redhat.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

2 files changed, 7 insertions, 0 deletions

diff --git a/drivers/net/wireless/libertas/defs.h b/drivers/net/wireless/libertas/defs.h
index 6388b05df4fc..e8dfde39abfc 100644
--- a/drivers/net/wireless/libertas/defs.h
+++ b/drivers/net/wireless/libertas/defs.h
@@ -265,6 +265,7 @@ static inline void lbs_deb_hex(unsigned int grp, const char *prompt, u8 *buf, in
 
 #define CMD_F_HOSTCMD           (1 << 0)
 #define FW_CAPINFO_WPA          (1 << 0)
+#define FW_CAPINFO_PS           (1 << 1)
 #define FW_CAPINFO_FIRMWARE_UPGRADE     (1 << 13)
 #define FW_CAPINFO_BOOT2_UPGRADE        (1<<14)
 #define FW_CAPINFO_PERSISTENT_CONFIG    (1<<15)
diff --git a/drivers/net/wireless/libertas/if_sdio.c b/drivers/net/wireless/libertas/if_sdio.c
index 4519d7314f47..987836865ea5 100644
--- a/drivers/net/wireless/libertas/if_sdio.c
+++ b/drivers/net/wireless/libertas/if_sdio.c
@@ -209,6 +209,9 @@ static int if_sdio_handle_event(struct if_sdio_card *card,
                 event = sdio_readb(card->func, IF_SDIO_EVENT, &ret);
                 if (ret)
                         goto out;
+
+                /* right shift 3 bits to get the event id */
+                event >>= 3;
         } else {
                 if (size < 4) {
                         lbs_deb_sdio("event packet too small (%d bytes)\n",
@@ -921,6 +924,9 @@ static int if_sdio_probe(struct sdio_func *func,
         if (ret)
                 goto err_activate_card;
 
+        if (priv->fwcapinfo & FW_CAPINFO_PS)
+                priv->ps_supported = 1;
+
 out:
         lbs_deb_leave_args(LBS_DEB_SDIO, "ret %d", ret);