linux-kernel - [065/272] ath9k_hw: Fix system hang when resuming from S3/S4

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Message-Id: <20110216001431.632671786@clark.kroah.org>
Date:	Tue, 15 Feb 2011 16:12:02 -0800
From:	Greg KH <gregkh@...e.de>
To:	linux-kernel@...r.kernel.org, stable@...nel.org
Cc:	stable-review@...nel.org, torvalds@...ux-foundation.org,
	akpm@...ux-foundation.org, alan@...rguk.ukuu.org.uk,
	Jack Lee <jlee@...eros.com>,
	Rajkumar Manoharan <rmanoharan@...eros.com>,
	"John W. Linville" <linville@...driver.com>
Subject: [065/272] ath9k_hw: Fix system hang when resuming from S3/S4

2.6.37-stable review patch.  If anyone has any objections, please let us know.

------------------

From: Rajkumar Manoharan <rmanoharan@...eros.com>

commit 5b64aa72ead6f8be488d2be7af579f0d69fb7a6e upstream.

The bit 6 & 7 of AR_WA (0x4004) should be enabled only
for the chips that are supporting L0s functionality
while resuming back from S3/S4.

Enabling these bits for AR9280 is causing system hang
within a few S3/S4-resume cycles.

Cc: Jack Lee <jlee@...eros.com>
Signed-off-by: Rajkumar Manoharan <rmanoharan@...eros.com>
Signed-off-by: John W. Linville <linville@...driver.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>

---
 drivers/net/wireless/ath/ath9k/ar9002_hw.c |    3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

--- a/drivers/net/wireless/ath/ath9k/ar9002_hw.c
+++ b/drivers/net/wireless/ath/ath9k/ar9002_hw.c
@@ -444,9 +444,8 @@ static void ar9002_hw_configpcipowersave
 		}
 
 		/* WAR for ASPM system hang */
-		if (AR_SREV_9280(ah) || AR_SREV_9285(ah) || AR_SREV_9287(ah)) {
+		if (AR_SREV_9285(ah) || AR_SREV_9287(ah))
 			val |= (AR_WA_BIT6 | AR_WA_BIT7);
-		}
 
 		if (AR_SREV_9285E_20(ah))
 			val |= AR_WA_BIT23;


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