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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>
This commit is contained in:
Vivek Natarajan 2010-10-30 22:05:13 +05:30 committed by John W. Linville
parent 5f841b4130
commit 10598c124e
3 changed files with 14 additions and 0 deletions
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1
drivers/net/wireless/ath/ath9k/ath9k.h
View File

@ -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;

8
drivers/net/wireless/ath/ath9k/init.c
View File

@ -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);

5
drivers/net/wireless/ath/ath9k/main.c
View File

@ -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");