Doug,
Looks good to me except for minor comment.
On Sat, August 10, 2013, Doug Anderson wrote:
> If the WAKEUP_INT is asserted at wakeup and not cleared, we'll end up
> looping around forever. This has been seen to happen on exynos5420
> silicon despite the fact that we haven't enabled any wakeup events due
> to a silicon errata. It is safe to do on all exynos variants.
>
> Signed-off-by: Doug Anderson <[email protected]>
> ---
> Changes in v5:
> - Cleaned up dw_mci_exynos_resume_noirq() comment as per Seungwon.
> - Don't memcpy dev_pm_ops structure, define a new one.
>
> Changes in v4:
> - Take Seungwon's suggestion and don't add any dw_mmc-pltfm code.
>
> Changes in v3:
> - Add freeze/thaw and poweroff/restore noirq entries.
>
> Changes in v2:
> - Use suspend_noirq as per James Hogan.
>
> drivers/mmc/host/dw_mmc-exynos.c | 56
> +++++++++++++++++++++++++++++++++++++++-
> 1 file changed, 55 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/mmc/host/dw_mmc-exynos.c
> b/drivers/mmc/host/dw_mmc-exynos.c
> index 866edef..7d88583 100644
> --- a/drivers/mmc/host/dw_mmc-exynos.c
> +++ b/drivers/mmc/host/dw_mmc-exynos.c
> @@ -30,6 +30,7 @@
> #define SDMMC_CLKSEL_TIMING(x, y, z) (SDMMC_CLKSEL_CCLK_SAMPLE(x) | \
> SDMMC_CLKSEL_CCLK_DRIVE(y) | \
> SDMMC_CLKSEL_CCLK_DIVIDER(z))
> +#define SDMMC_CLKSEL_WAKEUP_INT BIT(11)
>
> #define EXYNOS4210_FIXED_CIU_CLK_DIV 2
> #define EXYNOS4412_FIXED_CIU_CLK_DIV 4
> @@ -100,6 +101,52 @@ static int dw_mci_exynos_setup_clock(struct dw_mci *host)
> return 0;
> }
>
> +#ifdef CONFIG_PM_SLEEP
> +/*
> + * TODO: we should probably disable the clock to the card in the suspend
> path.
In suspend, clock is gated, isn't it?
Rather, no comment looks better, if intention is not clear.
Thanks,
Seungwon Jeon
> + */
> +static int dw_mci_exynos_suspend(struct device *dev)
> +{
> + struct dw_mci *host = dev_get_drvdata(dev);
> +
> + return dw_mci_suspend(host);
> +}
> +
> +static int dw_mci_exynos_resume(struct device *dev)
> +{
> + struct dw_mci *host = dev_get_drvdata(dev);
> +
> + return dw_mci_resume(host);
> +}
> +
> +/**
> + * dw_mci_exynos_resume_noirq - Exynos-specific resume code
> + *
> + * On exynos5420 there is a silicon errata that will sometimes leave the
> + * WAKEUP_INT bit in the CLKSEL register asserted. This bit is 1 to indicate
> + * that it fired and we can clear it by writing a 1 back. Clear it to
> prevent
> + * interrupts from going off constantly.
> + *
> + * We run this code on all exynos variants because it doesn't hurt.
> + */
> +
> +static int dw_mci_exynos_resume_noirq(struct device *dev)
> +{
> + struct dw_mci *host = dev_get_drvdata(dev);
> + u32 clksel;
> +
> + clksel = mci_readl(host, CLKSEL);
> + if (clksel & SDMMC_CLKSEL_WAKEUP_INT)
> + mci_writel(host, CLKSEL, clksel);
> +
> + return 0;
> +}
> +#else
> +#define dw_mci_exynos_suspend NULL
> +#define dw_mci_exynos_resume NULL
> +#define dw_mci_exynos_resume_noirq NULL
> +#endif /* CONFIG_PM_SLEEP */
> +
> static void dw_mci_exynos_prepare_command(struct dw_mci *host, u32 *cmdr)
> {
> /*
> @@ -187,13 +234,20 @@ static int dw_mci_exynos_probe(struct platform_device
> *pdev)
> return dw_mci_pltfm_register(pdev, drv_data);
> }
>
> +const struct dev_pm_ops dw_mci_exynos_pmops = {
> + SET_SYSTEM_SLEEP_PM_OPS(dw_mci_exynos_suspend, dw_mci_exynos_resume)
> + .resume_noirq = dw_mci_exynos_resume_noirq,
> + .thaw_noirq = dw_mci_exynos_resume_noirq,
> + .restore_noirq = dw_mci_exynos_resume_noirq,
> +};
> +
> static struct platform_driver dw_mci_exynos_pltfm_driver = {
> .probe = dw_mci_exynos_probe,
> .remove = __exit_p(dw_mci_pltfm_remove),
> .driver = {
> .name = "dwmmc_exynos",
> .of_match_table = dw_mci_exynos_match,
> - .pm = &dw_mci_pltfm_pmops,
> + .pm = &dw_mci_exynos_pmops,
> },
> };
>
> --
> 1.8.3
>
> --
> To unsubscribe from this list: send the line "unsubscribe linux-mmc" in
> the body of a message to [email protected]
> More majordomo info at http://vger.kernel.org/majordomo-info.html
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to [email protected]
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
