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 <prakity@marvell.com> Reviewed-by: Aaron Lu <aaron.lu@amd.com> Signed-off-by: Chris Ball <cjb@laptop.org>
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@ -1682,11 +1682,15 @@ static int sdhci_do_start_signal_voltage_switch(struct sdhci_host *host,
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pwr = sdhci_readb(host, SDHCI_POWER_CONTROL);
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pwr &= ~SDHCI_POWER_ON;
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sdhci_writeb(host, pwr, SDHCI_POWER_CONTROL);
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if (host->vmmc)
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regulator_disable(host->vmmc);
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/* Wait for 1ms as per the spec */
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usleep_range(1000, 1500);
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pwr |= SDHCI_POWER_ON;
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sdhci_writeb(host, pwr, SDHCI_POWER_CONTROL);
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if (host->vmmc)
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regulator_enable(host->vmmc);
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pr_info(DRIVER_NAME ": Switching to 1.8V signalling "
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"voltage failed, retrying with S18R set to 0\n");
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