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mmc: sdio: enable runtime PM for SDIO functions

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Enable runtime PM for SDIO functions.

SDIO functions are initialized with a disabled runtime PM state,
and are set active (and their usage count is incremented)
only before potential drivers are probed.

SDIO function drivers that support runtime PM should call
pm_runtime_put_noidle() in their probe routine, and
pm_runtime_get_noresume() in their remove routine (very
similarly to PCI drivers).

In case a matching driver does not support runtime PM, power will
always be kept high (since the usage count is positive).

Signed-off-by: Ohad Ben-Cohen <ohad@wizery.com>
Tested-by: Luciano Coelho <luciano.coelho@nokia.com>
Signed-off-by: Chris Ball <cjb@laptop.org>
This commit is contained in:
Ohad Ben-Cohen 2010-10-02 13:54:11 +02:00 committed by Chris Ball
parent 81968561bd
commit 40bba0c1ca
2 changed files with 40 additions and 3 deletions
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5
drivers/mmc/core/sdio.c
View File

@ -734,6 +734,11 @@ int mmc_attach_sdio(struct mmc_host *host, u32 ocr)
err = sdio_init_func(host->card, i + 1);
if (err)
goto remove;
/*
* Enable Runtime PM for this func
*/
pm_runtime_enable(&card->sdio_func[i]->dev);
}
mmc_release_host(host);

38
drivers/mmc/core/sdio_bus.c
View File

@ -126,21 +126,46 @@ static int sdio_bus_probe(struct device *dev)
if (!id)
return -ENODEV;
/* Unbound SDIO functions are always suspended.
* During probe, the function is set active and the usage count
* is incremented. If the driver supports runtime PM,
* it should call pm_runtime_put_noidle() in its probe routine and
* pm_runtime_get_noresume() in its remove routine.
*/
ret = pm_runtime_get_sync(dev);
if (ret < 0)
goto out;
/* Set the default block size so the driver is sure it's something
* sensible. */
sdio_claim_host(func);
ret = sdio_set_block_size(func, 0);
sdio_release_host(func);
if (ret)
return ret;
goto disable_runtimepm;
return drv->probe(func, id);
ret = drv->probe(func, id);
if (ret)
goto disable_runtimepm;
return 0;
disable_runtimepm:
pm_runtime_put_noidle(dev);
out:
return ret;
}
static int sdio_bus_remove(struct device *dev)
{
struct sdio_driver *drv = to_sdio_driver(dev->driver);
struct sdio_func *func = dev_to_sdio_func(dev);
int ret;
/* Make sure card is powered before invoking ->remove() */
ret = pm_runtime_get_sync(dev);
if (ret < 0)
goto out;
drv->remove(func);
@ -152,7 +177,14 @@ static int sdio_bus_remove(struct device *dev)
sdio_release_host(func);
}
return 0;
/* First, undo the increment made directly above */
pm_runtime_put_noidle(dev);
/* Then undo the runtime PM settings in sdio_bus_probe() */
pm_runtime_put_noidle(dev);
out:
return ret;
}
#ifdef CONFIG_PM_RUNTIME