On 21 December 2017 at 14:22, Michael Trimarchi
<michael@xxxxxxxxxxxxxxxxxxxx> wrote:
> mmc clock can be stopped during runtime suspend and restart during runtime
> resume. This let us know to not have any clock running and this reduce
> the EMI of the device when the bus is not in use
>
> Signed-off-by: Michael Trimarchi <michael@xxxxxxxxxxxxxxxxxxxx>
> ---
> drivers/mmc/host/sdhci-esdhc-imx.c | 5 +++++
> 1 file changed, 5 insertions(+)
>
> diff --git a/drivers/mmc/host/sdhci-esdhc-imx.c b/drivers/mmc/host/sdhci-esdhc-imx.c
> index 7123ef9..9a5e96f 100644
> --- a/drivers/mmc/host/sdhci-esdhc-imx.c
> +++ b/drivers/mmc/host/sdhci-esdhc-imx.c
> @@ -196,6 +196,7 @@ 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 */
> @@ -1346,6 +1347,9 @@ static int sdhci_esdhc_runtime_suspend(struct device *dev)
>
> ret = sdhci_runtime_suspend_host(host);
>
> + imx_data->actual_clock = host->mmc->actual_clock;
> + esdhc_pltfm_set_clock(host, 0);
I guess want the clock to stay on "if sdhci_sdio_irq_enabled(host)".
So you should probably move the above inside the below if statement.
> +
> if (!sdhci_sdio_irq_enabled(host)) {
> clk_disable_unprepare(imx_data->clk_per);
> clk_disable_unprepare(imx_data->clk_ipg);
> @@ -1366,6 +1370,7 @@ static int sdhci_esdhc_runtime_resume(struct device *dev)
> clk_prepare_enable(imx_data->clk_ipg);
> }
> clk_prepare_enable(imx_data->clk_ahb);
> + esdhc_pltfm_set_clock(host, imx_data->actual_clock);
>
> return sdhci_runtime_resume_host(host);
> }
> --
> 2.7.4
>
Kind regards
Uffe
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