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[v6,2/5] mmc: core: Add mmc_power_cycle

Message ID 1359382108-958-3-git-send-email-johan.rudholm@stericsson.com
State Accepted
Commit 276e090f9217b69e46d8255132d2667ac5eec51b
Headers show

Commit Message

Johan Rudholm Jan. 28, 2013, 2:08 p.m. UTC 
Add mmc_power_cycle which can be used to power cycle for instance
SD-cards.

Signed-off-by: Johan Rudholm <johan.rudholm@stericsson.com>
Acked-by: Ulf Hansson <ulf.hansson@linaro.org>
Tested-by: Wei WANG <wei_wang@realsil.com.cn>
---
 drivers/mmc/core/core.c |    8 ++++++++
 drivers/mmc/core/core.h |    1 +
 2 files changed, 9 insertions(+)
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Patch

diff --git a/drivers/mmc/core/core.c b/drivers/mmc/core/core.c
index 8b3a122..304c97c 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)
 {