wl12xx: implement SW Tx watchdog

Track freed FW blocks during Tx. If no blocks were freed during a
predefined timeout, initiate a HW recovery. This helps in situations
when the FW watchdog fails.

Don't trigger recovery during activities that can temporarily stop
Tx. This includes:
- scanning
- buffering packets for sleeping stations (AP role)
- ROC on any role

Signed-off-by: Arik Nemtsov <arik@wizery.com>
Signed-off-by: Eliad Peller <eliad@wizery.com>
Signed-off-by: Luciano Coelho <coelho@ti.com>

1 files changed, 8 insertions, 0 deletions

diff --git a/drivers/net/wireless/wl12xx/cmd.c b/drivers/net/wireless/wl12xx/cmd.c
index 1ef212f6440f..3414fc11e9ba 100644
--- a/drivers/net/wireless/wl12xx/cmd.c
+++ b/drivers/net/wireless/wl12xx/cmd.c
@@ -1818,6 +1818,14 @@ int wl12xx_croc(struct wl1271 *wl, u8 role_id)
                 goto out;
 
         __clear_bit(role_id, wl->roc_map);
+
+        /*
+         * Rearm the tx watchdog when removing the last ROC. This prevents
+         * recoveries due to just finished ROCs - when Tx hasn't yet had
+         * a chance to get out.
+         */
+        if (find_first_bit(wl->roc_map, WL12XX_MAX_ROLES) >= WL12XX_MAX_ROLES)
+                wl12xx_rearm_tx_watchdog_locked(wl);
 out:
         return ret;
 }