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mmc: do not switch to 1-bit mode if not required 

6b5eda36 followed SDIO spec part E1 section 8, which states that
in case SDIO interrupts are being used to wake up a suspended host,
then it is required to switch to 1-bit mode before stopping the clock.

Before switching to 1-bit mode (or back to 4-bit mode on resume),
make sure that SDIO interrupts are really being used to wake the host.

This is helpful for devices which have an external irq line (e.g.
wl1271), and do not use SDIO interrupts to wake up the host.

In this case, switching to 1-bit mode (and back to 4-bit mode on resume)
is not necessary.

Reported-by: Eliad Peller <eliad@wizery.com>
Signed-off-by: Ohad Ben-Cohen <ohad@wizery.com>
Signed-off-by: Chris Ball <cjb@laptop.org>
This commit is contained in:
Ohad Ben-Cohen 2011-04-05 17:43:21 +03:00 committed by Chris Ball
parent a5e9425d20
commit 6b93d01fe5
2 changed files with 6 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
drivers/mmc/core/sdio.c
View File

@ -625,7 +625,7 @@ static int mmc_sdio_suspend(struct mmc_host *host)
}
}
if (!err && mmc_card_keep_power(host)) {
if (!err && mmc_card_keep_power(host) && mmc_card_wake_sdio_irq(host)) {
mmc_claim_host(host);
sdio_disable_wide(host->card);
mmc_release_host(host);
@ -648,7 +648,7 @@ static int mmc_sdio_resume(struct mmc_host *host)
if (mmc_card_is_removable(host) || !mmc_card_keep_power(host))
err = mmc_sdio_init_card(host, host->ocr, host->card,
mmc_card_keep_power(host));
else if (mmc_card_keep_power(host)) {
else if (mmc_card_keep_power(host) && mmc_card_wake_sdio_irq(host)) {
/* We may have switched to 1-bit mode during suspend */
err = sdio_enable_4bit_bus(host->card);
if (err > 0) {

4
include/linux/mmc/host.h
View File

@ -325,5 +325,9 @@ static inline int mmc_card_keep_power(struct mmc_host *host)
return host->pm_flags & MMC_PM_KEEP_POWER;
}
static inline int mmc_card_wake_sdio_irq(struct mmc_host *host)
{
return host->pm_flags & MMC_PM_WAKE_SDIO_IRQ;
}
#endif