[PATCH] mmc: omap_hsmmc: Enable SDIO IRQ using a GPIO in idle mode.

[Tony Lindgren]

* Andreas Fenkart <andreas.fenkart at streamunlimited.com> [121220 14:15]:
> Without functional clock the omap_hsmmc module can't forward
> SDIO IRQs to the system. This patch reconfigures dat1 line
> as a gpio while the fclk is off. And uses SDIO IRQ detection of
> the module, while fclk is present.

Looks pretty good to me, however I could not figure out what
to apply this on for testing. It fails to apply at least against
current linux next, can you please update against that?
 
> +static void omap_hsmmc_enable_sdio_irq(struct mmc_host *mmc, int enable)
> +{
> +	struct omap_hsmmc_host *host = mmc_priv(mmc);
> +	u32 irq_mask;
> +	unsigned long flags;
> +
> +	spin_lock_irqsave(&host->irq_lock, flags);
> +
> +	host->sdio_irq_en = (enable != 0) ? true : false;
> +
> +	if (host->active_pinmux) {
> +		irq_mask = OMAP_HSMMC_READ(host->base, ISE);
> +		if (enable)
> +			irq_mask |= CIRQ_ENABLE;
> +		else
> +			irq_mask &= ~CIRQ_ENABLE;
> +		OMAP_HSMMC_WRITE(host->base, IE, irq_mask);
> +
> +		if (!host->req_in_progress)
> +			OMAP_HSMMC_WRITE(host->base, ISE, irq_mask);
> +
> +#if 0
> +		OMAP_HSMMC_READ(host->base, IE); /* flush posted write */
> +#endif

Maybe just replace #if 0 with just a comment in case it turns out to be
needed for some cases?

Regards,

Tony