linux-kernel - Re: [PATCH V3] mtd: Add DiskOnChip G3 support

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Date:	Wed, 21 Sep 2011 09:08:07 +0300
From:	Artem Bityutskiy <dedekind1@...il.com>
To:	Robert Jarzmik <robert.jarzmik@...e.fr>
Cc:	dwmw2@...radead.org, linux-mtd@...ts.infradead.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH V3] mtd: Add DiskOnChip G3 support

On Tue, 2011-09-20 at 17:44 +0200, Robert Jarzmik wrote:
> Artem Bityutskiy <dedekind1@...il.com> writes:
> 
> > I really feel unsure about merging this driver because no one reviewed
> > it. On the surface it does look neat, though. Could you please CC lkml
> > on next submission?
> OK, when we have covered your comments, I'll report a V4 to lkml as well.
> 
> > On Mon, 2011-09-19 at 19:43 +0200, Robert Jarzmik wrote:
> >> +static void doc_delay(struct docg3 *docg3, int nbNOPs)
> >> +{
> >> +	int i;
> >> +
> >> +	doc_dbg("NOP x %d\n", nbNOPs);
> >> +	for (i = 0; i < nbNOPs; i++)
> >> +		doc_writeb(0, DoC_NOP);
> >> +}
> >
> > Why you implement dalaying this way, instead of using udelay/mdelay?
> That's from observation, as I have no specification available.
> 
> From my understanding, the clock applied to the chip can be variable, but the
> memory bus writes ensure the necessary time, as the NOP write takes as much time
> as the DOCG3 decides it to last.

OK, would be nice to have this kind of comment in that function.

> >> +	};
> >
> > Hmm, looks like something which should be generic, not DoC-specific.
> True, but it's not available yet.
> And as it's not available, and I don't think debugfs will accept such a patch, I
> think I'll leave it here. And if you wish, I'll fill in a separate patch to
> debugfs, and *if* it's merged, I'll remove that part then.

Fine with me.

-- 
Best Regards,
Artem Bityutskiy

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