mmc: core: reset signal voltage on power up

Add a call to mmc_set_signal_voltage() to set signal voltage to 3.3v in
mmc_power_up so that we do not need to touch signal voltage setting in
mmc/sd/sdio init functions and rescan function.

For mmc/sd cards, when doing a suspend/resume cycle, consider the unsafe
resume case, the card will lose its power and when powered on again, we
will set signal voltage to 3.3v in mmc_power_up before its resume function
gets called, which will re-init the card.

And for sdio cards, when doing a suspend/resume cycle, consider the unsafe
resume case, the card will either lose its power or not depending on if it
wants to wakeup the host. If power is not maintained, it is the same case as
mmc/sd cards. If power is maintained, mmc_power_up will not be called and
the card's signal voltage will remain at the last setting.

Signed-off-by: Aaron Lu <aaron.lu@amd.com>
Tested-by: Venkatraman S <svenkatr@ti.com>
Signed-off-by: Chris Ball <cjb@laptop.org>

1 files changed, 3 insertions, 3 deletions

diff --git a/drivers/mmc/core/core.c b/drivers/mmc/core/core.c
index 9503cabc96f1..8ac5246e2ab2 100644
--- a/drivers/mmc/core/core.c
+++ b/drivers/mmc/core/core.c
@@ -1212,6 +1212,9 @@ static void mmc_power_up(struct mmc_host *host)
         host->ios.timing = MMC_TIMING_LEGACY;
         mmc_set_ios(host);
 
+        /* Set signal voltage to 3.3V */
+        mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_330, false);
+
         /*
          * This delay should be sufficient to allow the power supply
          * to reach the minimum voltage.
@@ -1963,9 +1966,6 @@ static int mmc_rescan_try_freq(struct mmc_host *host, unsigned freq)
          */
         mmc_hw_reset_for_init(host);
 
-        /* Initialization should be done at 3.3 V I/O voltage. */
-        mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_330, 0);
-
         /*
          * sdio_reset sends CMD52 to reset card.  Since we do not know
          * if the card is being re-initialized, just send it.  CMD52