From mboxrd@z Thu Jan 1 00:00:00 1970 From: ulf.hansson@linaro.org (Ulf Hansson) Date: Tue, 3 Sep 2013 11:29:34 +0200 Subject: [PATCH V3 2/4] mmc: mmci: Use optional sleep pinctrl state In-Reply-To: <1378200576-13413-1-git-send-email-ulf.hansson@linaro.org> References: <1378200576-13413-1-git-send-email-ulf.hansson@linaro.org> Message-ID: <1378200576-13413-3-git-send-email-ulf.hansson@linaro.org> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org 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 Acked-by: Rickard Andersson Cc: Linus Walleij --- drivers/mmc/host/mmci.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/drivers/mmc/host/mmci.c b/drivers/mmc/host/mmci.c index 5dffbbd..c550b3e 100644 --- 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; -- 1.7.9.5