wl12xx: Increase low & high TX watermarks

The current TX watermark settings cause the driver to stop queues too
frequently. Among other things, this can have a negative impact on WMM
prioritization, since mac80211 sorts pending packets by their ACs.

Fix this by increasing the high watermark to 256 packets. Increase the
low watermark to 32 to minimize periods with queues being stopped.
Signed-off-by: Ido Yariv <ido@wizery.com>
Signed-off-by: Luciano Coelho <coelho@ti.com>

drivers/net/wireless/wl12xx/wl12xx.h

@@ -639,8 +639,8 @@ size_t wl12xx_copy_fwlog(struct wl1271 *wl, u8 *memblock, size_t maxlen);
 
 #define WL1271_DEFAULT_POWER_LEVEL 0
 
-#define WL1271_TX_QUEUE_LOW_WATERMARK  10
-#define WL1271_TX_QUEUE_HIGH_WATERMARK 25
+#define WL1271_TX_QUEUE_LOW_WATERMARK  32
+#define WL1271_TX_QUEUE_HIGH_WATERMARK 256
 
 #define WL1271_DEFERRED_QUEUE_LIMIT    64