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Commit 10598c12 authored by Vivek Natarajan's avatar Vivek Natarajan Committed by John W. Linville
Browse files

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: default avatarVivek Natarajan <vnatarajan@atheros.com>
CC: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: default avatarJohn W. Linville <linville@tuxdriver.com>
parent 5f841b41

drivers/net/wireless/ath/ath9k/ath9k.h

+1 −0
Original line number Diff line number Diff line
@@ -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;

drivers/net/wireless/ath/ath9k/init.c

+8 −0
Original line number Diff line number Diff line
@@ -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);

drivers/net/wireless/ath/ath9k/main.c

+5 −0
Original line number Diff line number Diff line
@@ -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");