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>

1 files changed, 6 insertions, 0 deletions

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);