ath9k: Fix a DMA latency issue for Intel Pinetrail platforms.

Throughput was severely affected in Intel Pinetrail platforms
because of a DMA problem in C3 state. This patch fixes this
issue.

Signed-off-by: Vivek Natarajan <vnatarajan@atheros.com>
CC: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

diff --git a/drivers/net/wireless/ath/ath9k/ath9k.h b/drivers/net/wireless/ath/ath9k/ath9k.h
index 9b8e7e3fcebdbed0471be6ad0e412ee628057b78..170d44a35ccbd2ca06886be2be2ed8c1cd5dcf25 100644 (file)
--- a/drivers/net/wireless/ath/ath9k/ath9k.h
+++ b/drivers/net/wireless/ath/ath9k/ath9k.h
@@ -675,6 +675,7 @@ static inline void ath_read_cachesize(struct ath_common *common, int *csz)
 }
 
 extern struct ieee80211_ops ath9k_ops;
+extern struct pm_qos_request_list ath9k_pm_qos_req;
 extern int modparam_nohwcrypt;
 extern int led_blink;
 

diff --git a/drivers/net/wireless/ath/ath9k/init.c b/drivers/net/wireless/ath/ath9k/init.c
index 95b41db0d86b5b945189ba2c6fd1034043c26811..6a0d99eff404b77417856c7f1b7c035eb079359e 100644 (file)
--- a/drivers/net/wireless/ath/ath9k/init.c
+++ b/drivers/net/wireless/ath/ath9k/init.c
@@ -15,6 +15,7 @@
  */
 
 #include <linux/slab.h>
+#include <linux/pm_qos_params.h>
 
 #include "ath9k.h"
 
@@ -179,6 +180,8 @@ static const struct ath_ops ath9k_common_ops = {
        .write = ath9k_iowrite32,
 };
 
+struct pm_qos_request_list ath9k_pm_qos_req;
+
 /**************************/
 /*     Initialization     */
 /**************************/
@@ -756,6 +759,9 @@ int ath9k_init_device(u16 devid, struct ath_softc *sc, u16 subsysid,
        ath_init_leds(sc);
        ath_start_rfkill_poll(sc);
 
+       pm_qos_add_request(&ath9k_pm_qos_req, PM_QOS_CPU_DMA_LATENCY,
+                          PM_QOS_DEFAULT_VALUE);
+
        return 0;
 
 error_world:
@@ -811,6 +817,8 @@ void ath9k_deinit_device(struct ath_softc *sc)
 
        ath9k_ps_wakeup(sc);
 
+       pm_qos_remove_request(&ath9k_pm_qos_req);
+
        wiphy_rfkill_stop_polling(sc->hw->wiphy);
        ath_deinit_leds(sc);
 

diff --git a/drivers/net/wireless/ath/ath9k/main.c b/drivers/net/wireless/ath/ath9k/main.c
index cf6fa54a2fa3a618e85bb477a6a7da626a083510..09dcdd7882e6830ff8723832341e2755ecd7f08f 100644 (file)
--- a/drivers/net/wireless/ath/ath9k/main.c
+++ b/drivers/net/wireless/ath/ath9k/main.c
@@ -15,6 +15,7 @@
  */
 
 #include <linux/nl80211.h>
+#include <linux/pm_qos_params.h>
 #include "ath9k.h"
 #include "btcoex.h"
 
@@ -1239,6 +1240,8 @@ static int ath9k_start(struct ieee80211_hw *hw)
                        ath9k_btcoex_timer_resume(sc);
        }
 
+       pm_qos_update_request(&ath9k_pm_qos_req, 55);
+
 mutex_unlock:
        mutex_unlock(&sc->mutex);
 
@@ -1416,6 +1419,8 @@ static void ath9k_stop(struct ieee80211_hw *hw)
 
        sc->sc_flags |= SC_OP_INVALID;
 
+       pm_qos_update_request(&ath9k_pm_qos_req, PM_QOS_DEFAULT_VALUE);
+
        mutex_unlock(&sc->mutex);
 
        ath_print(common, ATH_DBG_CONFIG, "Driver halt\n");