On Fri, 25 Oct 2024 at 12:36, Stefan Wahren <wahrenst@xxxxxxx> wrote:
>
> Add a minimalistic suspend/resume PM support.
>
> Signed-off-by: Stefan Wahren <wahrenst@xxxxxxx>
> ---
> drivers/mmc/host/bcm2835.c | 25 +++++++++++++++++++++++++
> 1 file changed, 25 insertions(+)
>
> diff --git a/drivers/mmc/host/bcm2835.c b/drivers/mmc/host/bcm2835.c
> index 107666b7c1c8..17c327b7b5cc 100644
> --- a/drivers/mmc/host/bcm2835.c
> +++ b/drivers/mmc/host/bcm2835.c
> @@ -1343,6 +1343,30 @@ static int bcm2835_add_host(struct bcm2835_host *host)
> return 0;
> }
>
> +static int bcm2835_suspend(struct device *dev)
> +{
> + struct bcm2835_host *host = dev_get_drvdata(dev);
> +
> + if (!host->data_complete) {
> + dev_warn(dev, "Suspend is prevented\n");
> + return -EBUSY;
> + }
This should not be needed.
The mmc core makes sure all outstanding requests have been flushed,
before the host controller becomes suspended.
> +
> + clk_disable_unprepare(host->clk);
> +
> + return 0;
> +}
> +
> +static int bcm2835_resume(struct device *dev)
> +{
> + struct bcm2835_host *host = dev_get_drvdata(dev);
> +
> + return clk_prepare_enable(host->clk);
> +}
> +
> +static DEFINE_SIMPLE_DEV_PM_OPS(bcm2835_pm_ops, bcm2835_suspend,
> + bcm2835_resume);
> +
> static int bcm2835_probe(struct platform_device *pdev)
> {
> struct device *dev = &pdev->dev;
> @@ -1471,6 +1495,7 @@ static struct platform_driver bcm2835_driver = {
> .name = "sdhost-bcm2835",
> .probe_type = PROBE_PREFER_ASYNCHRONOUS,
> .of_match_table = bcm2835_match,
> + .pm = pm_ptr(&bcm2835_pm_ops),
> },
> };
> module_platform_driver(bcm2835_driver);
Kind regards
Uffe
