netdev - [PATCH RFC] igb: Fix false positive return of igb_get_auto_rd

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Message-ID: <1308682969-20690-1-git-send-email-guenter.roeck@ericsson.com>
Date:	Tue, 21 Jun 2011 12:02:49 -0700
From:	Guenter Roeck <guenter.roeck@...csson.com>
To:	Jeff Kirsher <jeffrey.t.kirsher@...el.com>,
	Jesse Brandeburg <jesse.brandeburg@...el.com>,
	Bruce Allan <bruce.w.allan@...el.com>,
	Carolyn Wyborny <carolyn.wyborny@...el.com>,
	Don Skidmore <donald.c.skidmore@...el.com>,
	Greg Rose <gregory.v.rose@...el.com>,
	PJ Waskiewicz <peter.p.waskiewicz.jr@...el.com>,
	Alex Duyck <alexander.h.duyck@...el.com>,
	John Ronciak <john.ronciak@...el.com>
CC:	<e1000-devel@...ts.sourceforge.net>, <netdev@...r.kernel.org>,
	Tong Ho <tong.ho@...csson.com>,
	Guenter Roeck <guenter.roeck@...csson.com>
Subject: [PATCH RFC] igb: Fix false positive return of igb_get_auto_rd_done for 82580

From: Tong Ho <tong.ho@...csson.com>

82580 re-reads the port specific portion of eeprom after port reset.
If called immediately after a reset, igb_get_auto_rd_done() returns
false positive because the done bit has yet to transition from 1 to 0.

Add wrfl() immediately after resetting 82580 port or device,
plus a 1ms delay, to avoid the problem.

Signed-off-by: Tong Ho <tong.ho@...csson.com>
Signed-off-by: Guenter Roeck <guenter.roeck@...csson.com>
---
Sent as RFC since I am not entirely sure if the solution is the correct one
to address the problem we are seeing. If there is a better solution, please
let me know.

 drivers/net/igb/e1000_82575.c |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/net/igb/e1000_82575.c b/drivers/net/igb/e1000_82575.c
index 0f563c8..28dae48 100644
--- a/drivers/net/igb/e1000_82575.c
+++ b/drivers/net/igb/e1000_82575.c
@@ -1735,10 +1735,10 @@ static s32 igb_reset_hw_82580(struct e1000_hw *hw)
 		ctrl |= E1000_CTRL_RST;
 
 	wr32(E1000_CTRL, ctrl);
+	wrfl();
 
 	/* Add delay to insure DEV_RST has time to complete */
-	if (global_device_reset)
-		msleep(5);
+	msleep(global_device_reset ? 5 : 1);
 
 	ret_val = igb_get_auto_rd_done(hw);
 	if (ret_val) {
-- 
1.7.3.1

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