From 276e090f9217b69e46d8255132d2667ac5eec51b Mon Sep 17 00:00:00 2001 From: Johan Rudholm Date: Mon, 28 Jan 2013 15:08:25 +0100 Subject: [PATCH] mmc: core: Add mmc_power_cycle Add mmc_power_cycle which can be used to power cycle for instance SD-cards. Signed-off-by: Johan Rudholm Acked-by: Ulf Hansson Tested-by: Wei WANG Signed-off-by: Chris Ball --- 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 39f28af..789056f 100644 --- a/drivers/mmc/core/core.c +++ b/drivers/mmc/core/core.c @@ -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. */ diff --git a/drivers/mmc/core/core.h b/drivers/mmc/core/core.h index 0272b32..9007de7 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) { -- 2.7.4