On Fri, Oct 21, 2011 at 05:25:54PM +0200, Ulf Hansson wrote:
> +#ifdef CONFIG_PM_RUNTIME
> +static int mmci_runtime_suspend(struct device *dev)
> +{
> + struct amba_device *adev = to_amba_device(dev);
> + struct mmc_host *mmc = amba_get_drvdata(adev);
> + unsigned long flags;
> +
> + if (mmc) {
> + struct mmci_host *host = mmc_priv(mmc);
> +
> + spin_lock_irqsave(&host->lock, flags);
> +
> + /* Save registers for POWER, CLOCK and IRQMASK0 */
> + host->irqmask0_reg = readl(host->base + MMCIMASK0);
> + host->pwr_reg = readl(host->base + MMCIPOWER);
> + host->clk_reg = readl(host->base + MMCICLOCK);
> +
> + /*
> + * Make sure we do not get any interrupts when we disabled the
> + * clock and the regulator and as well make sure to clear the
> + * registers for clock and power.
> + */
> + writel(0, host->base + MMCIMASK0);
> + writel(0, host->base + MMCIPOWER);
> + writel(0, host->base + MMCICLOCK);
Err, no. You're not allowed to power down the card between commands
unless the card has been removed or been has finished with.
If you power down the card (which you _are_ doing by writing zero to
the MMCIPOWER register), then you have to do a full setup of the card
when you resume.
This is completely unsuitable for runtime-PM usage.
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