Hi Guennadi,
On Thu, Apr 21, 2011 at 12:32:54PM +0200, Guennadi Liakhovetski wrote:
> The TMIO MMC driver cannot generally suspend itself at runtime even
> with no card inserted, because otherwise it wouldn't be able to detect
> new cards. But when the system goes down for a global suspend, we can
> use runtime PM calls to let it activate platform-specific PM hooks,
> e.g., to switch off respective power domains.
>
> Signed-off-by: Guennadi Liakhovetski <[email protected]>
> ---
> drivers/mmc/host/tmio_mmc.h | 2 ++
> drivers/mmc/host/tmio_mmc_pio.c | 6 ++++++
> 2 files changed, 8 insertions(+), 0 deletions(-)
>
> diff --git a/drivers/mmc/host/tmio_mmc.h b/drivers/mmc/host/tmio_mmc.h
> index 249c724..58138a2 100644
> --- a/drivers/mmc/host/tmio_mmc.h
> +++ b/drivers/mmc/host/tmio_mmc.h
> @@ -52,6 +52,8 @@ struct tmio_mmc_host {
> void (*set_pwr)(struct platform_device *host, int state);
> void (*set_clk_div)(struct platform_device *host, int state);
>
> + int pm_error;
I wonder if instead of adding an whole int to effectively
store one bit we could use some of the spare space in the
sdio_irq_enabled element, which is also an int that effectively
stores one bit.
Perhaps a bitmask or a bitfield?
I was thinking of doing something similar when adding support
for multiple IRQ vectors, as my current code also needs, wait for it,
one bit :-)
> +
> /* pio related stuff */
> struct scatterlist *sg_ptr;
> struct scatterlist *sg_orig;
> diff --git a/drivers/mmc/host/tmio_mmc_pio.c b/drivers/mmc/host/tmio_mmc_pio.c
> index d1791ba..26598f1 100644
> --- a/drivers/mmc/host/tmio_mmc_pio.c
> +++ b/drivers/mmc/host/tmio_mmc_pio.c
> @@ -980,6 +980,8 @@ int tmio_mmc_host_suspend(struct device *dev)
> if (!ret)
> tmio_mmc_disable_mmc_irqs(host, TMIO_MASK_ALL);
>
> + host->pm_error = pm_runtime_put_sync(dev);
> +
> return ret;
> }
> EXPORT_SYMBOL(tmio_mmc_host_suspend);
> @@ -987,6 +989,10 @@ EXPORT_SYMBOL(tmio_mmc_host_suspend);
> int tmio_mmc_host_resume(struct device *dev)
> {
> struct mmc_host *mmc = dev_get_drvdata(dev);
> + struct tmio_mmc_host *host = mmc_priv(mmc);
> +
> + if (!host->pm_error)
> + pm_runtime_get_sync(dev);
>
> tmio_mmc_reset(mmc_priv(mmc));
>
> --
> 1.7.2.5
>
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