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mmc: sdhci-esdhc-imx: Enable/Disable mmc clock during runtime suspend 

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>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
This commit is contained in:
Michael Trimarchi 2018-01-04 16:30:59 +01:00 committed by Ulf Hansson
parent a0ad308758
commit 3602785b34
1 changed files with 4 additions and 0 deletions
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4
drivers/mmc/host/sdhci-esdhc-imx.c
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@ -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);