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mmc: block: Enable runtime pm for mmc blkdevice

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Once the mmc blkdevice is being probed, runtime pm will be enabled.
By using runtime autosuspend, the power save operations can be done
when request inactivity occurs for a certain time. Right now the
selected timeout value is set to 3 s. Obviously this value will likely
need to be configurable somehow since it needs to be trimmed depending
on the power save algorithm.

For SD-combo cards, we are still leaving the enablement of runtime PM
to the SDIO init sequence since it depends on the capabilities of the
SDIO func driver.

Moreover, when the blk device is being suspended, we make sure the device
will be runtime resumed. The reason for doing this is that we want the
host suspend sequence to be unaware of any runtime power save operations
done for the card in this phase. Thus it can just handle the suspend as
the card is fully powered from a runtime perspective.

Finally, this patch prepares to make it possible to move BKOPS handling
into the runtime callbacks for the mmc bus_ops. Thus IDLE BKOPS can be
accomplished.

Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Signed-off-by: Chris Ball <cjb@laptop.org>
This commit is contained in:
Ulf Hansson
2013-05-02 14:02:38 +02:00
committed by Chris Ball
parent 12d01d0b81
commit e94cfef698
6 changed files with 60 additions and 14 deletions
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drivers/mmc/core/debugfs.c
+4 -4
View File
@@ -258,13 +258,13 @@ static int mmc_dbg_card_status_get(void *data, u64 *val)
u32 status;
int ret;
mmc_claim_host(card->host);
mmc_get_card(card);
ret = mmc_send_status(data, &status);
if (!ret)
*val = status;
mmc_release_host(card->host);
mmc_put_card(card);
return ret;
}
@@ -291,9 +291,9 @@ static int mmc_ext_csd_open(struct inode *inode, struct file *filp)
goto out_free;
}
mmc_claim_host(card->host);
mmc_get_card(card);
err = mmc_send_ext_csd(card, ext_csd);
mmc_release_host(card->host);
mmc_put_card(card);
if (err)
goto out_free;