netdev - Re: [PATCH 2/2] DM9000B: Fix PHY power for network down/up

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Date:	Mon, 21 Feb 2011 14:14:39 +0300
From:	Sergei Shtylyov <sshtylyov@...sta.com>
To:	Henry Nestler <henry.nestler@...il.com>
CC:	netdev@...r.kernel.org, tori@...appy.mine.nu,
	akpm@...ux-foundation.org, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH 2/2] DM9000B: Fix PHY power for network down/up

Hello.

On 21-02-2011 0:45, Henry Nestler wrote:

> DM9000 revision B needs 1 ms delay after PHY power on (see spec), and PHY
> power must on in register

    Couldn't parse that.

> DM9000_GPR before all other settings will change.
> Remember, that register DM9000_GPR was not changed by reset sequence.

> Without these fix the FIFO goes out of sync and sends wrong data after

    s/these/this/

> sequence of "ifconfig ethX down ; sleep 3 ; ifconfig ethX up".
[...]

> diff --git a/drivers/net/dm9000.c b/drivers/net/dm9000.c
> index 2d4c4fc..5925569 100644
> --- a/drivers/net/dm9000.c
> +++ b/drivers/net/dm9000.c
[...]
> @@ -1194,6 +1191,10 @@ dm9000_open(struct net_device *dev)
>   	if (request_irq(dev->irq, dm9000_interrupt, irqflags, dev->name, dev))
>   		return -EAGAIN;
>
> +	/* GPIO0 on pre-activate PHY, Reg 1F is not set by reset */
> +	iow(db, DM9000_GPR, 0);	/* REG_1F bit0 activate phyxcer */
> +	udelay(1000); /* delay needs by DM9000B */

    Why not mdelay(1)?

WBR, Sergei
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