From 70bc85ad1f32408ed92474c2e4d4db6e9714dcf3 Mon Sep 17 00:00:00 2001 From: Zhoujie Wu Date: Thu, 3 Aug 2017 12:28:40 -0700 Subject: [PATCH] mmc: sdhci: ignore restoring the I/O state if MMC_POWER_OFF 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 Signed-off-by: Adrian Hunter Signed-off-by: Ulf Hansson --- drivers/mmc/host/sdhci.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c index cf2166e..4a70f2f 100644 --- a/drivers/mmc/host/sdhci.c +++ b/drivers/mmc/host/sdhci.c @@ -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; -- 2.7.4