linux-kernel - [ 058/147] ath9k: Disable ASPM only for AR9285

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Message-Id: <20121014143541.719122603@decadent.org.uk>
Date:	Sun, 14 Oct 2012 15:36:31 +0100
From:	Ben Hutchings <ben@...adent.org.uk>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:	akpm@...ux-foundation.org, alan@...rguk.ukuu.org.uk,
	Sujith Manoharan <c_manoha@...lcomm.com>,
	Sujith Manoharan <c_manoha@....qualcomm.com>,
	Paul Stewart <pstew@...omium.org>,
	"John W. Linville" <linville@...driver.com>
Subject: [ 058/147] ath9k: Disable ASPM only for AR9285

3.2-stable review patch.  If anyone has any objections, please let me know.

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

From: Sujith Manoharan <c_manoha@...lcomm.com>

commit 046b6802c8d3c8a57448485513bf7291633e0fa3 upstream.

Currently, ASPM is disabled for all WLAN+BT combo chipsets
when BTCOEX is enabled. This is incorrect since the workaround
is required only for WB195, which is a AR9285+AR3011 combo
solution. Fix this by checking for the HW version when enabling
the workaround.

Signed-off-by: Sujith Manoharan <c_manoha@....qualcomm.com>
Tested-by: Paul Stewart <pstew@...omium.org>
Signed-off-by: John W. Linville <linville@...driver.com>
[bwh: Backported to 3.2: ath9k_hw_get_btcoex_scheme() function is missing]
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 drivers/net/wireless/ath/ath9k/pci.c |    5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

--- a/drivers/net/wireless/ath/ath9k/pci.c
+++ b/drivers/net/wireless/ath/ath9k/pci.c
@@ -122,8 +122,9 @@ static void ath_pci_aspm_init(struct ath
 	if (!parent)
 		return;
 
-	if (ah->btcoex_hw.scheme != ATH_BTCOEX_CFG_NONE) {
-		/* Bluetooth coexistance requires disabling ASPM. */
+	if ((ah->btcoex_hw.scheme != ATH_BTCOEX_CFG_NONE) &&
+	    (AR_SREV_9285(ah))) {
+		/* Bluetooth coexistance requires disabling ASPM for AR9285. */
 		pci_read_config_byte(pdev, pos + PCI_EXP_LNKCTL, &aspm);
 		aspm &= ~(PCIE_LINK_STATE_L0S | PCIE_LINK_STATE_L1);
 		pci_write_config_byte(pdev, pos + PCI_EXP_LNKCTL, aspm);


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