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mmc: sdhci: ignore restoring the I/O state if MMC_POWER_OFF

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One issue was found on a removable high speed sd card with
runtime pm enabled.
When SD card is unplugged, it keep printing "Switching to 3.3V
signalling voltage failed".
And found below sequence triggers the error.

mmc_rescan
	-> mmc_sd_detect
		-> mmc_power_off  -- mmc->ios.vdd is updated to 0.
	-> mmc_claim_host
		-> sdhci_runtime_resume_host
			-> sdhci_start_signal_voltage_switch
				-> mmc_regulator_set_vqmmc
					-> mmc_ocrbitnum_to_vdd

When mmc_ocrbitnum_to_vdd is called, the mmc->ios.vdd is 0, so it
always return -EINVAL. The signal switch will always fail and
print out warning.
Ignore restoring the I/O state when runtime resume if MMC_POWER_OFF.

Signed-off-by: Zhoujie Wu <zjwu@marvell.com>
Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
This commit is contained in:
Zhoujie Wu 2017-08-03 12:28:40 -07:00 committed by Ulf Hansson
parent b939e0b73e
commit 70bc85ad1f
1 changed files with 2 additions and 1 deletions
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3
drivers/mmc/host/sdhci.c
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@ -2934,7 +2934,8 @@ int sdhci_runtime_resume_host(struct sdhci_host *host)
sdhci_init(host, 0);
if (mmc->ios.power_mode != MMC_POWER_UNDEFINED) {
if (mmc->ios.power_mode != MMC_POWER_UNDEFINED &&
mmc->ios.power_mode != MMC_POWER_OFF) {
/* Force clock and power re-program */
host->pwr = 0;
host->clock = 0;