linux-kernel - Re: [PATCH 2.6.21-rc1] serial: serial

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Date:	Wed, 21 Feb 2007 18:11:28 +0000
From:	Alan <alan@...rguk.ukuu.org.uk>
To:	Atsushi Nemoto <anemo@....ocn.ne.jp>
Cc:	linux-kernel@...r.kernel.org, akpm@...ux-foundation.org,
	ralf@...ux-mips.org
Subject: Re: [PATCH 2.6.21-rc1] serial: serial_txx9 driver update

> Then I'll put udelay() and a timeout counter for it.  If udelay() was
> in the busy loop, cpu_relax() is still recommended?

The udelay should deal with it for you.
 
> Here is a patch on top of the previous one.  If this was OK I'll fold
> it into one patch.

Looks good to me

> +	while ((sio_in(up, TXX9_SIFCR) & TXX9_SIFCR_SWRST) && --tmout)
> +		udelay(1);
>  	/* TX Int by FIFO Empty, RX Int by Receiving 1 char. */
>  	sio_set(up, TXX9_SIFCR,
>  		TXX9_SIFCR_TDIL_MAX | TXX9_SIFCR_RDIL_1);


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