From: Shawn Guo <shawn.guo@linaro.org>
To: netdev@vger.kernel.org
Cc: "David S. Miller" <davem@davemloft.net>,
linux-arm-kernel@lists.infradead.org, patches@linaro.org,
Shawn Guo <shawn.guo@linaro.org>
Subject: [PATCH 3/4] net/fec: set phy_speed to the optimal frequency 2.5 MHz
Date: Sun, 18 Sep 2011 19:54:11 +0800 [thread overview]
Message-ID: <1316346852-17090-4-git-send-email-shawn.guo@linaro.org> (raw)
In-Reply-To: <1316346852-17090-1-git-send-email-shawn.guo@linaro.org>
With the unnecessary 1 bit left-shift on fep->phy_speed during the
calculation, the phy_speed always runs at the half frequency of the
optimal one 2.5 MHz.
The patch removes that 1 bit left-shift to get the optimal phy_speed.
Signed-off-by: Shawn Guo <shawn.guo@linaro.org>
---
drivers/net/fec.c | 2 +-
1 files changed, 1 insertions(+), 1 deletions(-)
diff --git a/drivers/net/fec.c b/drivers/net/fec.c
index 5ef0e34..04206e4 100644
--- a/drivers/net/fec.c
+++ b/drivers/net/fec.c
@@ -1007,7 +1007,7 @@ static int fec_enet_mii_init(struct platform_device *pdev)
/*
* Set MII speed to 2.5 MHz (= clk_get_rate() / 2 * phy_speed)
*/
- fep->phy_speed = DIV_ROUND_UP(clk_get_rate(fep->clk), 5000000) << 1;
+ fep->phy_speed = DIV_ROUND_UP(clk_get_rate(fep->clk), 5000000);
writel(fep->phy_speed, fep->hwp + FEC_MII_SPEED);
fep->mii_bus = mdiobus_alloc();
--
1.7.4.1
next prev parent reply other threads:[~2011-09-18 11:53 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-09-18 11:54 [PATCH 0/4] add fec support for imx6q Shawn Guo
2011-09-18 11:54 ` [PATCH 1/4] net/fec: change phy-reset-gpio request warning to debug message Shawn Guo
2011-09-18 11:54 ` [PATCH 2/4] net/fec: fix fec1 check in fec_enet_mii_init() Shawn Guo
2011-09-18 11:54 ` Shawn Guo [this message]
2011-09-19 22:39 ` [PATCH 3/4] net/fec: set phy_speed to the optimal frequency 2.5 MHz Troy Kisky
2011-09-20 2:57 ` Shawn Guo
2011-09-20 20:05 ` Troy Kisky
2011-09-20 20:10 ` Troy Kisky
2011-09-20 7:50 ` Lothar Waßmann
2011-09-20 8:14 ` Shawn Guo
2011-09-20 19:11 ` David Miller
2011-09-18 11:54 ` [PATCH 4/4] net/fec: add imx6q enet support Shawn Guo
2011-09-18 18:09 ` Francois Romieu
2011-09-19 9:08 ` Shawn Guo
2011-09-20 19:08 ` [PATCH 0/4] add fec support for imx6q David Miller
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