[PATCH] mmc: host: sdhci. UHS Switch failure - cycle power if regulator is used

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From: Philip Rakity <prakity@xxxxxxxxxxx>

Power needs to be removed from the card when switching to 1.8v fails.

If a regulator is used to control vmmc we need to turn the
regulator off and then back on otherwise power will not be removed
from the card.

Signed-off-by: Philip Rakity <prakity@xxxxxxxxxxx>
---
 drivers/mmc/host/sdhci.c |    4 ++++
 1 files changed, 4 insertions(+), 0 deletions(-)

diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c
index f4b8b4d..ef4231a 100644
--- a/drivers/mmc/host/sdhci.c
+++ b/drivers/mmc/host/sdhci.c
@@ -1663,11 +1663,15 @@ static int sdhci_do_start_signal_voltage_switch(struct sdhci_host *host,
 		pwr = sdhci_readb(host, SDHCI_POWER_CONTROL);
 		pwr &= ~SDHCI_POWER_ON;
 		sdhci_writeb(host, pwr, SDHCI_POWER_CONTROL);
+		if (host->vmmc)
+			regulator_disable(host->vmmc);
 
 		/* Wait for 1ms as per the spec */
 		usleep_range(1000, 1500);
 		pwr |= SDHCI_POWER_ON;
 		sdhci_writeb(host, pwr, SDHCI_POWER_CONTROL);
+		if (host->vmmc)
+			regulator_enable(host->vmmc);
 
 		pr_info(DRIVER_NAME ": Switching to 1.8V signalling "
 			"voltage failed, retrying with S18R set to 0\n");
-- 
1.7.0.4

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