To disable a levelshifter when we are in an idle state will
decrease current consumption. We make use of the ios_handler
at runtime suspend and at regular suspend to accomplish this.
Of course depending on the used levelshifter the decrease of
current differs. For ST6G3244ME the value is up to ~200 uA.
Tested-by: Linus Walleij <linus.walleij@xxxxxxxxxx>
Signed-off-by: Ulf Hansson <ulf.hansson@xxxxxxxxxxxxxx>
Signed-off-by: Linus Walleij <linus.walleij@xxxxxxxxxx>
---
drivers/mmc/host/mmci.c | 19 ++++++++++++++++++-
1 files changed, 18 insertions(+), 1 deletions(-)
diff --git a/drivers/mmc/host/mmci.c b/drivers/mmc/host/mmci.c
index a7c8f8f..76ce2cd 100644
--- a/drivers/mmc/host/mmci.c
+++ b/drivers/mmc/host/mmci.c
@@ -1505,10 +1505,22 @@ static int mmci_save(struct amba_device *dev)
{
struct mmc_host *mmc = amba_get_drvdata(dev);
unsigned long flags;
+ struct mmc_ios ios;
+ int ret = 0;
if (mmc) {
struct mmci_host *host = mmc_priv(mmc);
+ /* Let the ios_handler act on a POWER_OFF to save power. */
+ if (host->plat->ios_handler) {
+ memcpy(&ios, &mmc->ios, sizeof(struct mmc_ios));
+ ios.power_mode = MMC_POWER_OFF;
+ ret = host->plat->ios_handler(mmc_dev(mmc),
+ &ios);
+ if (ret)
+ return ret;
+ }
+
spin_lock_irqsave(&host->lock, flags);
/*
@@ -1527,7 +1539,7 @@ static int mmci_save(struct amba_device *dev)
amba_vcore_disable(dev);
}
- return 0;
+ return ret;
}
static int mmci_restore(struct amba_device *dev)
@@ -1550,6 +1562,11 @@ static int mmci_restore(struct amba_device *dev)
writel(MCI_IRQENABLE, host->base + MMCIMASK0);
spin_unlock_irqrestore(&host->lock, flags);
+
+ /* Restore settings done by the ios_handler. */
+ if (host->plat->ios_handler)
+ host->plat->ios_handler(mmc_dev(mmc),
+ &mmc->ios);
}
return 0;
--
1.7.5.4
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