linux-kernel - Re: [PATCH 1:2] [MTD][NAND]omap: Adding support for nand prefetch-read and post-write, in MPU mode.

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Message-Id: <200907101101.58029.david-b@pacbell.net>
Date:	Fri, 10 Jul 2009 11:01:57 -0700
From:	David Brownell <david-b@...bell.net>
To:	"vimal singh" <vimalsingh@...com>
Cc:	linux-mtd@...ts.infradead.org, "Tony Lindgren" <tony@...mide.com>,
	dwmw2@...radead.org, dedekind@...radead.org,
	linux-kernel@...r.kernel.org, linux-omap@...r.kernel.org
Subject: Re: [PATCH 1:2] [MTD][NAND]omap: Adding support for nand prefetch-read  and post-write, in MPU mode.

On Friday 10 July 2009, vimal singh wrote:
> +static void omap_read_buf8(struct mtd_info *mtd, u_char *buf, int len)
> +{
> +       struct nand_chip *nand = mtd->priv;
> +       u_char *p = (u_char *)buf;
> +
> +       while (len--)
> +               *p++ = __raw_readb(nand->IO_ADDR_R);
> +}

Better as __raw_readsb() yes?  Or maybe ioread8_rep().

... speaking of which, maybe the MTD layer can finally
default to using the accelerated block PIO calls, now
that ioreadX_rep() is supposed to work on all arches...

Last time I measured, that change alone was worth
something like a 10% speedup.  Maybe more.
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