| Message ID | 20240102-j7200-pcie-s2r-v1-3-84e55da52400@bootlin.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | Add suspend to ram support for PCIe on J7200 | expand |
On Mon, Jan 15, 2024 at 6:16 PM Thomas Richard <thomas.richard@bootlin.com> wrote: > > A device may need the controller up during suspend_noirq or > resume_noirq. > But if the controller is autosuspended, there is no way to wakeup it > during suspend_noirq or resume_noirq because runtime pm is disabled > at this time. > > The suspend callback wakes up the controller, so it is available until > its suspend_noirq callback (pm_runtime_force_suspend). > During the resume, it's restored by resume_noirq callback > (pm_runtime_force_resume). Then resume callback enables autosuspend. > > So the controller is up during a little time slot in suspend and resume > sequences even if it's not used. Same comment ->...callback...() ... > } > > + Stray blank line is added. > +static int omap_i2c_suspend(struct device *dev)
diff --git a/drivers/i2c/busses/i2c-omap.c b/drivers/i2c/busses/i2c-omap.c index 42165ef57946..57f0738fa748 100644 --- a/drivers/i2c/busses/i2c-omap.c +++ b/drivers/i2c/busses/i2c-omap.c @@ -1575,9 +1575,24 @@ static int __maybe_unused omap_i2c_runtime_resume(struct device *dev) return 0; } + +static int omap_i2c_suspend(struct device *dev) +{ + return pm_runtime_resume_and_get(dev); +} + +static int omap_i2c_resume(struct device *dev) +{ + pm_runtime_mark_last_busy(dev); + pm_runtime_put_autosuspend(dev); + + return 0; +} + static const struct dev_pm_ops omap_i2c_pm_ops = { SET_NOIRQ_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend, pm_runtime_force_resume) + SET_SYSTEM_SLEEP_PM_OPS(omap_i2c_suspend, omap_i2c_resume) SET_RUNTIME_PM_OPS(omap_i2c_runtime_suspend, omap_i2c_runtime_resume, NULL) };
A device may need the controller up during suspend_noirq or resume_noirq. But if the controller is autosuspended, there is no way to wakeup it during suspend_noirq or resume_noirq because runtime pm is disabled at this time. The suspend callback wakes up the controller, so it is available until its suspend_noirq callback (pm_runtime_force_suspend). During the resume, it's restored by resume_noirq callback (pm_runtime_force_resume). Then resume callback enables autosuspend. So the controller is up during a little time slot in suspend and resume sequences even if it's not used. Signed-off-by: Thomas Richard <thomas.richard@bootlin.com> --- drivers/i2c/busses/i2c-omap.c | 15 +++++++++++++++ 1 file changed, 15 insertions(+)