ARM: 7832/1: mmc: mmci: Use optional sleep pinctrl state

By optionally putting the pins into sleep state in the .runtime_suspend
callback we can accomplish two things. One is to minimize current leakage
from pins and thus save power, second we can prevent the IP from driving
pins output in an uncontrolled manner, which may happen if the power domain
drops the domain regulator.

When returning from idle, entering .runtime_resume callback, the pins
are restored to default state.

Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Acked-by: Rickard Andersson <rickard.andersson@stericsson.com>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

diff --git a/drivers/mmc/host/mmci.c b/drivers/mmc/host/mmci.c
index 5dffbbd576631f57fd31c6c4c7d571d61b3cf3c5..c550b3ebb6358512643c63dff5109370224f0021 100644 (file)
--- a/drivers/mmc/host/mmci.c
+++ b/drivers/mmc/host/mmci.c
@@ -1750,6 +1750,7 @@ static int mmci_runtime_suspend(struct device *dev)
 
        if (mmc) {
                struct mmci_host *host = mmc_priv(mmc);
+               pinctrl_pm_select_sleep_state(dev);
                clk_disable_unprepare(host->clk);
        }
 
@@ -1764,6 +1765,7 @@ static int mmci_runtime_resume(struct device *dev)
        if (mmc) {
                struct mmci_host *host = mmc_priv(mmc);
                clk_prepare_enable(host->clk);
+               pinctrl_pm_select_default_state(dev);
        }
 
        return 0;