| Message ID | 20241025103621.4780-6-wahrenst@gmx.net (mailing list archive) |
|---|---|
| State | New |
| Headers | show |
| Series | ARM: bcm2835: Implement initial S2Idle for Raspberry Pi | expand |
On Fri, 25 Oct 2024 at 12:36, Stefan Wahren <wahrenst@gmx.net> wrote: > > Add a minimalistic suspend/resume PM support. > > Signed-off-by: Stefan Wahren <wahrenst@gmx.net> > --- > 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
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; + } + + 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);
Add a minimalistic suspend/resume PM support. Signed-off-by: Stefan Wahren <wahrenst@gmx.net> --- drivers/mmc/host/bcm2835.c | 25 +++++++++++++++++++++++++ 1 file changed, 25 insertions(+) -- 2.34.1