linux-kernel - Re: [PATCHv2 4/5] mtd: mxc

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Date:	Mon, 21 Jun 2010 13:47:41 +0200
From:	Ivo Clarysse <ivo.clarysse@...il.com>
To:	John Ogness <john.ogness@...utronix.de>
Cc:	Sascha Hauer <s.hauer@...gutronix.de>,
	Sascha Hauer <kernel@...gutronix.de>,
	linux-arm-kernel@...ts.infradead.org,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCHv2 4/5] mtd: mxc_nand fixups

On Sun, Jun 20, 2010 at 11:21 AM, John Ogness <john.ogness@...utronix.de> wrote:
>
> On 2010-06-20, Ivo Clarysse <ivo.clarysse@...il.com> wrote:
> > Yes, on i.MX21, NFC interrupts can be masked using
> > NFC_CONFIG1:NFC_INT_MSK.  But I observed that as long as NFC_INT_MSK
> > is set, NFC_CONFIG2:NFC_INT will always read out 0 on i.MX21, even if
> > the operation is completed.
> >
> > So the driver will remain stuck at:
> >
> >                  wait_event(host->irq_waitq,
> >                          readw(host->regs + NFC_CONFIG2) & NFC_INT);
>
> OK. Here is alternative patch. Do you have access to an i.MX21 to test
> this on?
>
> This patch fixes the driver so that the irq is requested as disabled. This
> prevents double irq enabling and also does not require the interrupt to
> be disabled within the interrupt handler. (Actually, I beleive this was
> the true intention of the original author.)
[...]

Yes, that was indeed my true intention :)

I tested this change on an MX21ADS board.

Acked-by: Ivo Clarysse <ivo.clarysse@...il.com>
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