From: Mohammed Shafi Shajakhan<mshajakhan@xxxxxxxxxxx>
The DMA latency issue is observed only in Intel pinetrail platforms but
in the driver we had a default PM-QOS value of 55. This caused
unnecessary power consumption and battery drain in other platforms.
Remove the pm-qos thing in the driver code and address the
throughput issue in
Intel pinetrail platfroms in user space using any one of the scripts
in below links:
http://www.kernel.org/pub/linux/kernel/people/mcgrof/scripts/cpudmalatency.c
http://johannes.sipsolutions.net/files/netlatency.c.txt
More details can be found in the following bugzilla link:
https://bugzilla.kernel.org/show_bug.cgi?id=27532
Signed-off-by: Mohammed Shafi Shajakhan<mshajakhan@xxxxxxxxxxx>
---
drivers/net/wireless/ath/ath9k/ath9k.h | 5 -----
drivers/net/wireless/ath/ath9k/init.c | 7 -------
drivers/net/wireless/ath/ath9k/main.c | 8 --------
3 files changed, 0 insertions(+), 20 deletions(-)
diff --git a/drivers/net/wireless/ath/ath9k/ath9k.h
b/drivers/net/wireless/ath/ath9k/ath9k.h
index ba436cd..0052f64 100644
--- a/drivers/net/wireless/ath/ath9k/ath9k.h
+++ b/drivers/net/wireless/ath/ath9k/ath9k.h
@@ -21,7 +21,6 @@
#include<linux/device.h>
#include<linux/leds.h>
#include<linux/completion.h>
-#include<linux/pm_qos_params.h>
#include "debug.h"
#include "common.h"
@@ -57,8 +56,6 @@ struct ath_node;
#define A_MAX(a, b) ((a)> (b) ? (a) : (b))
-#define ATH9K_PM_QOS_DEFAULT_VALUE 55
-
#define TSF_TO_TU(_h,_l) \
((((u32)(_h))<< 22) | (((u32)(_l))>> 10))
@@ -650,7 +647,6 @@ struct ath_softc {
struct ath_ant_comb ant_comb;
- struct pm_qos_request_list pm_qos_req;
};
void ath9k_tasklet(unsigned long data);
@@ -665,7 +661,6 @@ static inline void ath_read_cachesize(struct
ath_common *common, int *csz)
extern struct ieee80211_ops ath9k_ops;
extern int ath9k_modparam_nohwcrypt;
extern int led_blink;
-extern int ath9k_pm_qos_value;
extern bool is_ath9k_unloaded;
irqreturn_t ath_isr(int irq, void *dev);
diff --git a/drivers/net/wireless/ath/ath9k/init.c
b/drivers/net/wireless/ath/ath9k/init.c
index e5c1eea..8fed4e4 100644
--- a/drivers/net/wireless/ath/ath9k/init.c
+++ b/drivers/net/wireless/ath/ath9k/init.c
@@ -41,9 +41,6 @@ static int ath9k_btcoex_enable;
module_param_named(btcoex_enable, ath9k_btcoex_enable, int, 0444);
MODULE_PARM_DESC(btcoex_enable, "Enable wifi-BT coexistence");
-int ath9k_pm_qos_value = ATH9K_PM_QOS_DEFAULT_VALUE;
-module_param_named(pmqos, ath9k_pm_qos_value, int, S_IRUSR |
S_IRGRP | S_IROTH);
-MODULE_PARM_DESC(pmqos, "User specified PM-QOS value");
bool is_ath9k_unloaded;
/* We use the hw_value as an index into our private channel
structure */
@@ -760,9 +757,6 @@ 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(&sc->pm_qos_req, PM_QOS_CPU_DMA_LATENCY,
- PM_QOS_DEFAULT_VALUE);
-
return 0;
error_world:
@@ -819,7 +813,6 @@ void ath9k_deinit_device(struct ath_softc *sc)
ath9k_ps_restore(sc);
ieee80211_unregister_hw(hw);
- pm_qos_remove_request(&sc->pm_qos_req);
ath_rx_cleanup(sc);
ath_tx_cleanup(sc);
ath9k_deinit_softc(sc);
diff --git a/drivers/net/wireless/ath/ath9k/main.c
b/drivers/net/wireless/ath/ath9k/main.c
index 4f568b8..1d2c7c3 100644
--- a/drivers/net/wireless/ath/ath9k/main.c
+++ b/drivers/net/wireless/ath/ath9k/main.c
@@ -1117,12 +1117,6 @@ static int ath9k_start(struct ieee80211_hw *hw)
ath9k_btcoex_timer_resume(sc);
}
- /* User has the option to provide pm-qos value as a module
- * parameter rather than using the default value of
- * 'ATH9K_PM_QOS_DEFAULT_VALUE'.
- */
- pm_qos_update_request(&sc->pm_qos_req, ath9k_pm_qos_value);
-
if (ah->caps.pcie_lcr_extsync_en&&
common->bus_ops->extn_synch_en)
common->bus_ops->extn_synch_en(common);
@@ -1267,8 +1261,6 @@ static void ath9k_stop(struct ieee80211_hw *hw)
sc->sc_flags |= SC_OP_INVALID;
- pm_qos_update_request(&sc->pm_qos_req, PM_QOS_DEFAULT_VALUE);
-
mutex_unlock(&sc->mutex);
ath_dbg(common, ATH_DBG_CONFIG, "Driver halt\n");
--
1.7.0.4
