Add mmc_power_cycle which can be used to power cycle for instance
SD-cards.
Signed-off-by: Johan Rudholm <johan.rudholm@xxxxxxxxxxxxxx>
---
drivers/mmc/core/core.c | 8 ++++++++
drivers/mmc/core/core.h | 1 +
2 files changed, 9 insertions(+)
diff --git a/drivers/mmc/core/core.c b/drivers/mmc/core/core.c
index aaed768..285f064 100644
--- a/drivers/mmc/core/core.c
+++ b/drivers/mmc/core/core.c
@@ -1372,6 +1372,14 @@ 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.
*/
diff --git a/drivers/mmc/core/core.h b/drivers/mmc/core/core.h
index 3bdafbc..4a90067 100644
--- a/drivers/mmc/core/core.h
+++ b/drivers/mmc/core/core.h
@@ -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)
{
--
1.7.10
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