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ath9k: Fix ath9k prevents CPU to enter C3 states

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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

This reverts the following commits:

	98c316e348
	4dc3530df7
	10598c124e

Signed-off-by: Mohammed Shafi Shajakhan <mshajakhan@atheros.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Mohammed Shafi Shajakhan
2011-02-15 21:29:32 +05:30
committed by John W. Linville
parent a7b545f7fe
commit 0f5cd45960
3 changed files with 0 additions and 22 deletions
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8
drivers/net/wireless/ath/ath9k/main.c
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@@ -1173,12 +1173,6 @@ 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);
@@ -1345,8 +1339,6 @@ 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");