On 26 April 2014 21:34, Sebastian Hesselbarth
<sebastian.hesselbarth@xxxxxxxxx> 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@xxxxxxxxx>
> Acked-by: Jason Cooper <jason@xxxxxxxxxxxxxx>
> ---
> Cc: Nicolas Pitre <nico@xxxxxxxxxxx>
> Cc: Chris Ball <chris@xxxxxxxxxx>
> Cc: Ulf Hansson <ulf.hansson@xxxxxxxxxx>
> Cc: Jason Cooper <jason@xxxxxxxxxxxxxx>
> Cc: Andrew Lunn <andrew@xxxxxxx>
> Cc: Gregory Clement <gregory.clement@xxxxxxxxxxxxxxxxxx>
> Cc: linux-mmc@xxxxxxxxxxxxxxx
> Cc: linux-arm-kernel@xxxxxxxxxxxxxxxxxxx
> Cc: linux-kernel@xxxxxxxxxxxxxxx
Acked-by: Ulf Hansson <ulf.hansson@xxxxxxxxxx>
> ---
> 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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