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@iki.fi> Acked-by: Francois Romieu <romieu@fr.zoreil.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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@ -560,10 +560,10 @@ static void mdio_write(void __iomem *ioaddr, int reg_addr, int value)
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udelay(25);
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}
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/*
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* Some configurations require a small delay even after the write
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* completed indication or the next write might fail.
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* According to hardware specs a 20us delay is required after write
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* complete indication, but before sending next command.
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*/
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udelay(25);
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udelay(20);
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}
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static int mdio_read(void __iomem *ioaddr, int reg_addr)
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@ -583,6 +583,12 @@ static int mdio_read(void __iomem *ioaddr, int reg_addr)
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}
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udelay(25);
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}
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/*
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* According to hardware specs a 20us delay is required after read
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* complete indication, but before sending next command.
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*/
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udelay(20);
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return value;
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}
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