netdev - [PATCH v2 04/10] net/fec: improve pm for better suspend/resume

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Message-ID: <1294133056-21195-5-git-send-email-shawn.guo@freescale.com>
Date:	Tue, 4 Jan 2011 17:24:10 +0800
From:	Shawn Guo <shawn.guo@...escale.com>
To:	<davem@...emloft.net>, <gerg@...pgear.com>, <baruch@...s.co.il>,
	<eric@...rea.com>, <bryan.wu@...onical.com>,
	<r64343@...escale.com>, <B32542@...escale.com>,
	<u.kleine-koenig@...gutronix.de>, <lw@...o-electronics.de>,
	<w.sang@...gutronix.de>, <s.hauer@...gutronix.de>,
	<netdev@...r.kernel.org>, <linux-arm-kernel@...ts.infradead.org>,
	<shawn.guo@...escale.com>
Subject: [PATCH v2 04/10] net/fec: improve pm for better suspend/resume

The following commit made a fix to use fec_enet_open/fec_enet_close
over fec_enet_init/fec_stop for suspend/resume, because fec_enet_init
does not allow to have a working network interface at resume.

  e3fe8558c7fc182972c3d947d88744482111f304
  net/fec: fix pm to survive to suspend/resume

This fix works for i.mx/mxc fec controller, but fails on mx28 fec
which gets a different interrupt logic design. On i.mx fec, interrupt
can be triggered even bit ETHER_EN of ECR register is not set. But
on mx28 fec, ETHER_EN must be set to get interrupt work. Meanwhile,
MII interrupt is mandatory to resume the driver, because MDIO
read/write changed to interrupt mode by commit below.

  97b72e4320a9aaa4a7f1592ee7d2da7e2c9bd349
  fec: use interrupt for MDIO completion indication

fec_restart/fec_stop comes out as the solution working for both
cases.

Signed-off-by: Shawn Guo <shawn.guo@...escale.com>
---
 drivers/net/fec.c |   12 ++++++++----
 1 files changed, 8 insertions(+), 4 deletions(-)

diff --git a/drivers/net/fec.c b/drivers/net/fec.c
index cd59814..f147508 100644
--- a/drivers/net/fec.c
+++ b/drivers/net/fec.c
@@ -1387,8 +1387,10 @@ fec_suspend(struct device *dev)
 
 	if (ndev) {
 		fep = netdev_priv(ndev);
-		if (netif_running(ndev))
-			fec_enet_close(ndev);
+		if (netif_running(ndev)) {
+			fec_stop(ndev);
+			netif_device_detach(ndev);
+		}
 		clk_disable(fep->clk);
 	}
 	return 0;
@@ -1403,8 +1405,10 @@ fec_resume(struct device *dev)
 	if (ndev) {
 		fep = netdev_priv(ndev);
 		clk_enable(fep->clk);
-		if (netif_running(ndev))
-			fec_enet_open(ndev);
+		if (netif_running(ndev)) {
+			fec_restart(ndev, fep->full_duplex);
+			netif_device_attach(ndev);
+		}
 	}
 	return 0;
 }
-- 
1.7.1


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