mmc: sdhci: Fix to handle MMC_POWER_UNDEFINED
Since commit c2c24819b280 ("mmc: core: Don't power off the card when
starting the host"), the power state can still be MMC_POWER_UNDEFINED after
mmc_start_host() is called. That can trigger a warning in SDHCI during
runtime resume as it tries to restore the I/O state. Handle
MMC_POWER_UNDEFINED simply by not updating the I/O state in that case.
Fixes: c2c24819b280 ("mmc: core: Don't power off the card when starting the host")
Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c
index 111991e..2390980 100644
--- a/drivers/mmc/host/sdhci.c
+++ b/drivers/mmc/host/sdhci.c
@@ -1576,6 +1576,9 @@ static void sdhci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
unsigned long flags;
u8 ctrl;
+ if (ios->power_mode == MMC_POWER_UNDEFINED)
+ return;
+
spin_lock_irqsave(&host->lock, flags);
if (host->flags & SDHCI_DEVICE_DEAD) {
@@ -2938,23 +2941,25 @@ int sdhci_runtime_resume_host(struct sdhci_host *host)
sdhci_init(host, 0);
- /* Force clock and power re-program */
- host->pwr = 0;
- host->clock = 0;
- mmc->ops->start_signal_voltage_switch(mmc, &mmc->ios);
- mmc->ops->set_ios(mmc, &mmc->ios);
+ if (mmc->ios.power_mode != MMC_POWER_UNDEFINED) {
+ /* Force clock and power re-program */
+ host->pwr = 0;
+ host->clock = 0;
+ mmc->ops->start_signal_voltage_switch(mmc, &mmc->ios);
+ mmc->ops->set_ios(mmc, &mmc->ios);
- if ((host_flags & SDHCI_PV_ENABLED) &&
- !(host->quirks2 & SDHCI_QUIRK2_PRESET_VALUE_BROKEN)) {
- spin_lock_irqsave(&host->lock, flags);
- sdhci_enable_preset_value(host, true);
- spin_unlock_irqrestore(&host->lock, flags);
+ if ((host_flags & SDHCI_PV_ENABLED) &&
+ !(host->quirks2 & SDHCI_QUIRK2_PRESET_VALUE_BROKEN)) {
+ spin_lock_irqsave(&host->lock, flags);
+ sdhci_enable_preset_value(host, true);
+ spin_unlock_irqrestore(&host->lock, flags);
+ }
+
+ if ((mmc->caps2 & MMC_CAP2_HS400_ES) &&
+ mmc->ops->hs400_enhanced_strobe)
+ mmc->ops->hs400_enhanced_strobe(mmc, &mmc->ios);
}
- if ((mmc->caps2 & MMC_CAP2_HS400_ES) &&
- mmc->ops->hs400_enhanced_strobe)
- mmc->ops->hs400_enhanced_strobe(mmc, &mmc->ios);
-
spin_lock_irqsave(&host->lock, flags);
host->runtime_suspended = false;