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, 0 insertions, 7 deletions

diff --git a/drivers/mmc/core/sdio.c b/drivers/mmc/core/sdio.c
index 41c5fd8..d4619e2 100644
--- a/drivers/mmc/core/sdio.c
+++ b/drivers/mmc/core/sdio.c
@@ -591,9 +591,6 @@ static int mmc_sdio_init_card(struct mmc_host *host, u32 ocr,
 	 * Inform the card of the voltage
 	 */
 	if (!powered_resume) {
-		/* The initialization should be done at 3.3 V I/O voltage. */
-		mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_330, 0);
-
 		err = mmc_send_io_op_cond(host, host->ocr, &ocr);
 		if (err)
 			goto err;
@@ -1006,10 +1003,6 @@ static int mmc_sdio_power_restore(struct mmc_host *host)
 	 * restore the correct voltage setting of the card.
 	 */
 
-	/* The initialization should be done at 3.3 V I/O voltage. */
-	if (!mmc_card_keep_power(host))
-		mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_330, 0);
-
 	sdio_reset(host);
 	mmc_go_idle(host);
 	mmc_send_if_cond(host, host->ocr_avail);