linux-kernel - Re: [PATCH RESEND 2/3] mmc: mvsdio: workaround for spurious irqs

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Date:	Mon, 28 Apr 2014 13:02:42 +0200
From:	Ulf Hansson <ulf.hansson@...aro.org>
To:	Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>
Cc:	Nicolas Pitre <nico@...xnic.net>, Chris Ball <chris@...ntf.net>,
	Jason Cooper <jason@...edaemon.net>,
	Andrew Lunn <andrew@...n.ch>,
	Gregory Clement <gregory.clement@...e-electrons.com>,
	linux-mmc <linux-mmc@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH RESEND 2/3] mmc: mvsdio: workaround for spurious irqs

On 26 April 2014 21:34, Sebastian Hesselbarth
<sebastian.hesselbarth@...il.com> wrote:
> SDIO controllers found on Marvell Kirkwood SoCs seem to cause a late,
> spurious irq although all interrupts have been disabled. This irq
> doesn't do any harm, neither to HW nor driver. To avoid some
> "unexpected irq" warning later, we workaround above issue by bailing
> out of irq handler early, if we didn't expect any.
>
> Signed-off-by: Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>
> Acked-by: Jason Cooper <jason@...edaemon.net>
> ---
> Cc: Nicolas Pitre <nico@...xnic.net>
> Cc: Chris Ball <chris@...ntf.net>
> Cc: Ulf Hansson <ulf.hansson@...aro.org>
> Cc: Jason Cooper <jason@...edaemon.net>
> Cc: Andrew Lunn <andrew@...n.ch>
> Cc: Gregory Clement <gregory.clement@...e-electrons.com>
> Cc: linux-mmc@...r.kernel.org
> Cc: linux-arm-kernel@...ts.infradead.org
> Cc: linux-kernel@...r.kernel.org

Acked-by: Ulf Hansson <ulf.hansson@...aro.org>

> ---
>  drivers/mmc/host/mvsdio.c | 14 ++++++++++++++
>  1 file changed, 14 insertions(+)
>
> diff --git a/drivers/mmc/host/mvsdio.c b/drivers/mmc/host/mvsdio.c
> index 41aca7f28c23..9377284f8544 100644
> --- a/drivers/mmc/host/mvsdio.c
> +++ b/drivers/mmc/host/mvsdio.c
> @@ -354,6 +354,20 @@ static irqreturn_t mvsd_irq(int irq, void *dev)
>                 intr_status, mvsd_read(MVSD_NOR_INTR_EN),
>                 mvsd_read(MVSD_HW_STATE));
>
> +       /*
> +        * It looks like, SDIO IP can issue one late, spurious irq
> +        * although all irqs should be disabled. To work around this,
> +        * bail out early, if we didn't expect any irqs to occur.
> +        */
> +       if (!mvsd_read(MVSD_NOR_INTR_EN) && !mvsd_read(MVSD_ERR_INTR_EN)) {
> +               dev_dbg(host->dev, "spurious irq detected intr 0x%04x intr_en 0x%04x erri 0x%04x erri_en 0x%04x\n",
> +                       mvsd_read(MVSD_NOR_INTR_STATUS),
> +                       mvsd_read(MVSD_NOR_INTR_EN),
> +                       mvsd_read(MVSD_ERR_INTR_STATUS),
> +                       mvsd_read(MVSD_ERR_INTR_EN));
> +               return IRQ_HANDLED;
> +       }
> +
>         spin_lock(&host->lock);
>
>         /* PIO handling, if needed. Messy business... */
> --
> 1.9.1
>
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