From 38cfc2f71cec9508bdd3a11e576738c2182418d0 Mon Sep 17 00:00:00 2001 From: Philip Rakity Date: Wed, 27 Jun 2012 09:15:00 -0700 Subject: [PATCH] mmc: sdhci: When a UHS switch fails, cycle power if regulator is used 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 Reviewed-by: Aaron Lu Signed-off-by: Chris Ball --- drivers/mmc/host/sdhci.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c index bc1de70360c8..d9966568143b 100644 --- a/drivers/mmc/host/sdhci.c +++ b/drivers/mmc/host/sdhci.c @@ -1682,11 +1682,15 @@ 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"); -- 2.20.1