[PATCH 3/3] mmc: sdhci-esdhc-imx: Enable/Disable mmc clock during runtime suspend

[Michael Trimarchi <michael@amarulasolutions.com>]

mmc clock can be stopped during runtime suspend and restart during runtime
resume if the sdio irq is not enabled. Stop sdio clock reduce EMI of
the device when the bus is not in use.

Signed-off-by: Michael Trimarchi <michael@amarulasolutions.com>
---
Changes V2->V3:
	- move clock re-order on a separated patch

Changes V1->V2:
	- rebase to latest linux
	- address sdio irq wakeup
	- move the clock enable clk_ahb up to be balance
	  with the runtime suspend function and to make
	  function more clean by the end without two if
	  condition
---
 drivers/mmc/host/sdhci-esdhc-imx.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/mmc/host/sdhci-esdhc-imx.c b/drivers/mmc/host/sdhci-esdhc-imx.c
index 6d4e323..53cc1b6 100644
--- a/drivers/mmc/host/sdhci-esdhc-imx.c
+++ b/drivers/mmc/host/sdhci-esdhc-imx.c
@@ -193,6 +193,7 @@ struct pltfm_imx_data {
 	struct clk *clk_ipg;
 	struct clk *clk_ahb;
 	struct clk *clk_per;
+	unsigned int actual_clock;
 	enum {
 		NO_CMD_PENDING,      /* no multiblock command pending */
 		MULTIBLK_IN_PROCESS, /* exact multiblock cmd in process */
@@ -1396,6 +1397,8 @@ static int sdhci_esdhc_runtime_suspend(struct device *dev)
 		mmc_retune_needed(host->mmc);
 
 	if (!sdhci_sdio_irq_enabled(host)) {
+		imx_data->actual_clock = host->mmc->actual_clock;
+		esdhc_pltfm_set_clock(host, 0);
 		clk_disable_unprepare(imx_data->clk_per);
 		clk_disable_unprepare(imx_data->clk_ipg);
 	}
@@ -1422,6 +1425,7 @@ static int sdhci_esdhc_runtime_resume(struct device *dev)
 		err = clk_prepare_enable(imx_data->clk_ipg);
 		if (err)
 			goto disable_per_clk;
+		esdhc_pltfm_set_clock(host, imx_data->actual_clock);
 	}
 
 	err = sdhci_runtime_resume_host(host);
-- 
2.7.4