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Message-Id: <1276060930-15697-1-git-send-email-timo.teras@iki.fi> Date: Wed, 9 Jun 2010 08:22:10 +0300 From: Timo Teräs <timo.teras@....fi> To: netdev@...r.kernel.org Cc: Timo Teräs <timo.teras@....fi>, Francois Romieu <romieu@...zoreil.com>, Hayeswang <hayeswang@...ltek.com> Subject: [PATCH] r8169: fix mdio_read and update mdio_write according to hw specs Realtek confirmed that a 20us delay is needed after mdio_read and mdio_write operations. Reduce the delay in mdio_write, and add it to mdio_read too. Also add a comment that the 20us is from hw specs. Signed-off-by: Timo Teräs <timo.teras@....fi> Cc: Francois Romieu <romieu@...zoreil.com> Cc: Hayeswang <hayeswang@...ltek.com> --- drivers/net/r8169.c | 12 +++++++++--- 1 files changed, 9 insertions(+), 3 deletions(-) diff --git a/drivers/net/r8169.c b/drivers/net/r8169.c index 03a8318..96b6cfb 100644 --- a/drivers/net/r8169.c +++ b/drivers/net/r8169.c @@ -560,10 +560,10 @@ static void mdio_write(void __iomem *ioaddr, int reg_addr, int value) udelay(25); } /* - * Some configurations require a small delay even after the write - * completed indication or the next write might fail. + * According to hardware specs a 20us delay is required after write + * complete indication, but before sending next command. */ - udelay(25); + udelay(20); } static int mdio_read(void __iomem *ioaddr, int reg_addr) @@ -583,6 +583,12 @@ static int mdio_read(void __iomem *ioaddr, int reg_addr) } udelay(25); } + /* + * According to hardware specs a 20us delay is required after read + * complete indication, but before sending next command. + */ + udelay(20); + return value; } -- 1.7.0.4 -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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