netdev - [PATCH net-next 2/4] igb: do not clobber the TSAUXC bits on reset.

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Date:	Tue, 18 Nov 2014 00:06:23 +0100
From:	Richard Cochran <richardcochran@...il.com>
To:	<netdev@...r.kernel.org>
Cc:	David Miller <davem@...emloft.net>, <bruce.w.allan@...el.com>,
	Jacob Keller <jacob.e.keller@...el.com>,
	Jeff Kirsher <jeffrey.t.kirsher@...el.com>,
	John Ronciak <john.ronciak@...el.com>,
	Matthew Vick <matthew.vick@...el.com>
Subject: [PATCH net-next 2/4] igb: do not clobber the TSAUXC bits on reset.

The TSAUXC register has a number of different bits, one of which disables
the main clock function. Previously, the clock was re-enabled by clearing
the entire register. This patch changes the code to preserve the values
of the other bits in that register.

Signed-off-by: Richard Cochran <richardcochran@...il.com>
---
 drivers/net/ethernet/intel/igb/igb_ptp.c |    8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/intel/igb/igb_ptp.c b/drivers/net/ethernet/intel/igb/igb_ptp.c
index 794c139..ce57128 100644
--- a/drivers/net/ethernet/intel/igb/igb_ptp.c
+++ b/drivers/net/ethernet/intel/igb/igb_ptp.c
@@ -905,6 +905,8 @@ void igb_ptp_stop(struct igb_adapter *adapter)
 void igb_ptp_reset(struct igb_adapter *adapter)
 {
 	struct e1000_hw *hw = &adapter->hw;
+	unsigned long flags;
+	u32 tsauxc;
 
 	if (!(adapter->flags & IGB_FLAG_PTP))
 		return;
@@ -923,7 +925,11 @@ void igb_ptp_reset(struct igb_adapter *adapter)
 	case e1000_i210:
 	case e1000_i211:
 		/* Enable the timer functions and interrupts. */
-		wr32(E1000_TSAUXC, 0x0);
+		spin_lock_irqsave(&adapter->tmreg_lock, flags);
+		tsauxc = rd32(E1000_TSAUXC);
+		tsauxc &= ~TSAUXC_DISABLE;
+		wr32(E1000_TSAUXC, tsauxc);
+		spin_unlock_irqrestore(&adapter->tmreg_lock, flags);
 		wr32(E1000_TSIM, TSYNC_INTERRUPTS);
 		wr32(E1000_IMS, E1000_IMS_TS);
 		break;
-- 
1.7.10.4

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