linux-kernel - RE: [PATCH v2 6/6] net: pch_gbe: Allow longer for resets

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Message-ID: <063D6719AE5E284EB5DD2968C1650D6D1CCD57CD@AcuExch.aculab.com>
Date:	Wed, 3 Feb 2016 16:51:34 +0000
From:	David Laight <David.Laight@...LAB.COM>
To:	'Paul Burton' <paul.burton@...tec.com>,
	"linux-mips@...ux-mips.org" <linux-mips@...ux-mips.org>,
	Ralf Baechle <ralf@...ux-mips.org>
CC:	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH v2 6/6] net: pch_gbe: Allow longer for resets

From: Paul Burton
> Sent: 03 February 2016 12:03
> Resets of the EG20T MAC on the MIPS Boston development board take longer
> than the 1000 loops that pch_gbe_wait_clr_bit was performing. Bump up
> the number of loops.
...
> diff --git a/drivers/net/ethernet/oki-semi/pch_gbe/pch_gbe_main.c b/drivers/net/ethernet/oki-
> semi/pch_gbe/pch_gbe_main.c
> index 00ef83c..87994d2 100644
> --- a/drivers/net/ethernet/oki-semi/pch_gbe/pch_gbe_main.c
> +++ b/drivers/net/ethernet/oki-semi/pch_gbe/pch_gbe_main.c
> @@ -321,7 +321,7 @@ static void pch_gbe_wait_clr_bit(void *reg, u32 bit)
>  	u32 tmp;
> 
>  	/* wait busy */
> -	tmp = 1000;
> +	tmp = 10000;
>  	while ((ioread32(reg) & bit) && --tmp)
>  		cpu_relax();
>  	if (!tmp)

Why not sleep for (say) 100us ?
That'll stop the loop depending on the cpu speed.

	David