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mmc: core: Add mmc_power_cycle

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Add mmc_power_cycle which can be used to power cycle for instance
SD-cards.

Signed-off-by: Johan Rudholm <[email protected]>
Acked-by: Ulf Hansson <[email protected]>
Tested-by: Wei WANG <[email protected]>
Signed-off-by: Chris Ball <[email protected]>
This commit is contained in:
Johan Rudholm 2013-01-28 15:08:25 +01:00 • committed by Chris Ball
commit 276e090f92
2 changed files with 9 additions and 0 deletions
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8
drivers/mmc/core/core.c
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@ -1470,6 +1470,14 @@ void mmc_power_off(struct mmc_host *host)
mmc_host_clk_release(host);
}
void mmc_power_cycle(struct mmc_host *host)
{
mmc_power_off(host);
/* Wait at least 1 ms according to SD spec */
mmc_delay(1);
mmc_power_up(host);
}
/*
* Cleanup when the last reference to the bus operator is dropped.
*/

1
drivers/mmc/core/core.h
View file

@ -45,6 +45,7 @@ int mmc_set_signal_voltage(struct mmc_host *host, int signal_voltage,
void mmc_set_timing(struct mmc_host *host, unsigned int timing);
void mmc_set_driver_type(struct mmc_host *host, unsigned int drv_type);
void mmc_power_off(struct mmc_host *host);
void mmc_power_cycle(struct mmc_host *host);
static inline void mmc_delay(unsigned int ms)
{