linux-kernel - [PATCH][NET] several cleanups and bugfixes for fec.c: preserve MII/RMII setting in fec

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Message-Id: <d6f4de9e4cfb393754b42815a2ef1a59c96eab83.1323163127.git.LW@KARO-electronics.de>
Date:	Tue,  6 Dec 2011 11:27:14 +0100
From:	Lothar Waßmann <LW@...O-electronics.de>
To:	netdev@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, Shawn Guo <shawn.guo@...aro.org>,
	linux-arm-kernel@...ts.infradead.org,
	Lothar Waßmann <LW@...O-electronics.de>
Subject: [PATCH][NET] several cleanups and bugfixes for fec.c: preserve MII/RMII setting in fec_stop()

Additionally to setting the ETHER_EN bit in FEC_ECNTRL the MII/RMII
setting in FEC_R_CNTRL needs to be preserved to keep the MII interface
functional.

Signed-off-by: Lothar Waßmann <LW@...O-electronics.de>
---
 drivers/net/ethernet/freescale/fec.c |    5 ++++-
 1 files changed, 4 insertions(+), 1 deletions(-)

diff --git a/drivers/net/ethernet/freescale/fec.c b/drivers/net/ethernet/freescale/fec.c
index 11534b9..ab0afb5 100644
--- a/drivers/net/ethernet/freescale/fec.c
+++ b/drivers/net/ethernet/freescale/fec.c
@@ -515,6 +515,7 @@ fec_stop(struct net_device *ndev)
 	struct fec_enet_private *fep = netdev_priv(ndev);
 	const struct platform_device_id *id_entry =
 				platform_get_device_id(fep->pdev);
+	u32 rmii_mode = readl(fep->hwp + FEC_R_CNTRL) & (1 << 8);
 
 	/* We cannot expect a graceful transmit stop without link !!! */
 	if (fep->link) {
@@ -531,8 +532,10 @@ fec_stop(struct net_device *ndev)
 	writel(FEC_DEFAULT_IMASK, fep->hwp + FEC_IMASK);
 
 	/* We have to keep ENET enabled to have MII interrupt stay working */
-	if (id_entry->driver_data & FEC_QUIRK_ENET_MAC)
+	if (id_entry->driver_data & FEC_QUIRK_ENET_MAC) {
 		writel(2, fep->hwp + FEC_ECNTRL);
+		writel(rmii_mode, fep->hwp + FEC_R_CNTRL);
+	}
 }
 
 
-- 
1.5.6.5

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