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 <[email protected]>
Tested-by: Venkatraman S <[email protected]>
Signed-off-by: Chris Ball <[email protected]>

diff --git a/drivers/mmc/core/core.c b/drivers/mmc/core/core.c
index 9503cabc96f1b6ada03e1ebc469c6153331d80f1..8ac5246e2ab2bc85a6ba82ee0a0eab732130fdf6 100644 (file)
--- 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

diff --git a/drivers/mmc/core/mmc.c b/drivers/mmc/core/mmc.c
index 4f4489aa6baede795ae21c222e0aa9e99e7b5800..396b25891bb90b59083adeb85769971b6c3057b0 100644 (file)
--- a/drivers/mmc/core/mmc.c
+++ b/drivers/mmc/core/mmc.c
@@ -818,9 +818,6 @@ static int mmc_init_card(struct mmc_host *host, u32 ocr,
        if (!mmc_host_is_spi(host))
                mmc_set_bus_mode(host, MMC_BUSMODE_OPENDRAIN);
 
-       /* Initialization should be done at 3.3 V I/O voltage. */
-       mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_330, 0);
-
        /*
         * Since we're changing the OCR value, we seem to
         * need to tell some cards to go back to the idle

diff --git a/drivers/mmc/core/sd.c b/drivers/mmc/core/sd.c
index 441bdf472c993faf505d84f2de0bad26f1dffec9..74972c241dff38751d5be3e0e653336e7e8892a5 100644 (file)
--- a/drivers/mmc/core/sd.c
+++ b/drivers/mmc/core/sd.c
@@ -901,9 +901,6 @@ static int mmc_sd_init_card(struct mmc_host *host, u32 ocr,
        BUG_ON(!host);
        WARN_ON(!host->claimed);
 
-       /* The initialization should be done at 3.3 V I/O voltage. */
-       mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_330, 0);
-
        err = mmc_sd_get_cid(host, ocr, cid, &rocr);
        if (err)
                return err;

diff --git a/drivers/mmc/core/sdio.c b/drivers/mmc/core/sdio.c
index 41c5fd8848f4d72c171d9e001b2171607e13eb83..d4619e2ec030bcf878dee7a0d43425046d52c2fe 100644 (file)
--- 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);