[PATCH] powerpc/85xx: Fix ethernet link detection on MPC8569E-MDS boards

[Anton Vorontsov]

On Wed, Jun 24, 2009 at 08:30:28PM +0400, Anton Vorontsov wrote:
> Linux isn't able to detect link changes on ethernet ports that were
> used by U-Boot. This is because U-Boot wrongly clears interrupt
> polarity bit (INTPOL, 0x400) in the extended status register (EXT_SR,
> 0x1b) of Marvell PHYs.
> 
> There is no easy way for PHY drivers to know IRQ line polarity (we
> could extract it from the device tree and pass it to phydevs, but
> that'll be quite a lot of work), so for now just reset the PHYs to
> their default states.
> 
> Signed-off-by: Anton Vorontsov <avorontsov at ru.mvista.com>
> ---

I think this should be safe for 2.6.31...

Thanks,

>  arch/powerpc/platforms/85xx/mpc85xx_mds.c |   13 +++++++++++++
>  1 files changed, 13 insertions(+), 0 deletions(-)
> 
> diff --git a/arch/powerpc/platforms/85xx/mpc85xx_mds.c b/arch/powerpc/platforms/85xx/mpc85xx_mds.c
> index 3268c95..34664c0 100644
> --- a/arch/powerpc/platforms/85xx/mpc85xx_mds.c
> +++ b/arch/powerpc/platforms/85xx/mpc85xx_mds.c
> @@ -223,6 +223,19 @@ static void __init mpc85xx_mds_setup_arch(void)
>  			/* Turn UCC1 & UCC2 on */
>  			setbits8(&bcsr_regs[8], BCSR_UCC1_GETH_EN);
>  			setbits8(&bcsr_regs[9], BCSR_UCC2_GETH_EN);
> +		} else if (machine_is(mpc8569_mds)) {
> +#define BCSR7_UCC12_GETHnRST	(0x1 << 2)
> +#define BCSR8_UEM_MARVELL_RST	(0x1 << 1)
> +			/*
> +			 * U-Boot mangles interrupt polarity for Marvell PHYs,
> +			 * so reset built-in and UEM Marvell PHYs, this puts
> +			 * the PHYs into their normal state.
> +			 */
> +			clrbits8(&bcsr_regs[7], BCSR7_UCC12_GETHnRST);
> +			setbits8(&bcsr_regs[8], BCSR8_UEM_MARVELL_RST);
> +
> +			setbits8(&bcsr_regs[7], BCSR7_UCC12_GETHnRST);
> +			clrbits8(&bcsr_regs[8], BCSR8_UEM_MARVELL_RST);
>  		}
>  		iounmap(bcsr_regs);
>  	}
> -- 
> 1.6.3.1
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-- 
Anton Vorontsov
email: cbouatmailru at gmail.com
irc://irc.freenode.net/bd2