wl1271: Work around AP's with broken ps-poll functionality

Some AP's (such as Zyxel Prestige 600) have totally broken ps-poll
functionality. When powersave is enabled, these AP's will set the TIM bit for
a STA in beacons, but when the STA responds with a ps-poll, the AP does not
respond with data.

The wl1271 firmware is able to send an indication to the host, when this
problem occurs. This patch adds implementation, which temporarily disables
power-save in response to this indication, allowing the AP to transmit whatever
data it has buffered for the STA / whatever data is inbound at that time.

This patch does not make these AP's work reliably in PSM, but improves the
chances of inbound data getting through.

The side effect of this patch is increased power consumption when using a
faulty AP.

Signed-off-by: Juuso Oikarinen <juuso.oikarinen@nokia.com>
Reviewed-by: Teemu Paasikivi <ext-teemu.3.paasikivi@nokia.com>
Signed-off-by: Luciano Coelho <luciano.coelho@nokia.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 5 insertions, 0 deletions

diff --git a/drivers/net/wireless/wl12xx/wl1271.h b/drivers/net/wireless/wl12xx/wl1271.h
index 1b52ce6a84d7..cfdccdb86067 100644
--- a/drivers/net/wireless/wl12xx/wl1271.h
+++ b/drivers/net/wireless/wl12xx/wl1271.h
@@ -351,6 +351,7 @@ struct wl1271 {
 #define WL1271_FLAG_IRQ_RUNNING       (10)
 #define WL1271_FLAG_IDLE              (11)
 #define WL1271_FLAG_IDLE_REQUESTED    (12)
+#define WL1271_FLAG_PSPOLL_FAILURE    (13)
         unsigned long flags;
 
         struct wl1271_partition_set part;
@@ -445,6 +446,10 @@ struct wl1271 {
 
         struct completion *elp_compl;
         struct delayed_work elp_work;
+        struct delayed_work pspoll_work;
+
+        /* counter for ps-poll delivery failures */
+        int ps_poll_failures;
 
         /* retry counter for PSM entries */
         u8 psm_entry_retry;