On Sun, 29 Dec 2024, Maciej S. Szmigiero wrote:
> Wakeup for IRQ1 should be disabled only in cases where i8042 had actually
> enabled it, otherwise "wake_depth" for this IRQ will try do drop below zero
> and there will be an unpleasant WARN() logged:
> kernel: atkbd serio0: Disabling IRQ1 wakeup source to avoid platform firmware bug
> kernel: ------------[ cut here ]------------
> kernel: Unbalanced IRQ 1 wake disable
> kernel: WARNING: CPU: 10 PID: 6431 at kernel/irq/manage.c:920 irq_set_irq_wake+0x147/0x1a0
>
> To fix this call the PMC suspend handler only from the same set of
> dev_pm_ops handlers as i8042_pm_suspend() is called, which currently means
> just the ".suspend" handler.
> Previously, the code would use DEFINE_SIMPLE_DEV_PM_OPS() to define its
> dev_pm_ops, which also called this handler on ".freeze" and ".poweroff".
>
> To reproduce this issue try hibernating (S4) the machine after a fresh boot
> without putting it into s2idle first.
>
> Fixes: 8e60615e8932 ("platform/x86/amd: pmc: Disable IRQ1 wakeup for RN/CZN")
> Signed-off-by: Maciej S. Szmigiero <mail@xxxxxxxxxxxxxxxxxxxxx>
> ---
> drivers/platform/x86/amd/pmc/pmc.c | 8 +++++++-
> 1 file changed, 7 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/platform/x86/amd/pmc/pmc.c b/drivers/platform/x86/amd/pmc/pmc.c
> index 26b878ee5191..a254debb9256 100644
> --- a/drivers/platform/x86/amd/pmc/pmc.c
> +++ b/drivers/platform/x86/amd/pmc/pmc.c
> @@ -947,6 +947,10 @@ static int amd_pmc_suspend_handler(struct device *dev)
> {
> struct amd_pmc_dev *pdev = dev_get_drvdata(dev);
>
> + /*
> + * Must be called only from the same set of dev_pm_ops handlers
> + * as i8042_pm_suspend() is called: currently just from .suspend.
> + */
> if (pdev->disable_8042_wakeup && !disable_workarounds) {
> int rc = amd_pmc_wa_irq1(pdev);
>
> @@ -959,7 +963,9 @@ static int amd_pmc_suspend_handler(struct device *dev)
> return 0;
> }
>
> -static DEFINE_SIMPLE_DEV_PM_OPS(amd_pmc_pm, amd_pmc_suspend_handler, NULL);
> +static const struct dev_pm_ops amd_pmc_pm = {
> + .suspend = amd_pmc_suspend_handler,
> +};
???
I cannot see what this change is supposed to achieve.
#define _DEFINE_DEV_PM_OPS(name, \
suspend_fn, resume_fn, \
runtime_suspend_fn, runtime_resume_fn, idle_fn) \
const struct dev_pm_ops name = { \
SYSTEM_SLEEP_PM_OPS(suspend_fn, resume_fn) \
RUNTIME_PM_OPS(runtime_suspend_fn, runtime_resume_fn, idle_fn) \
}
#define DEFINE_SIMPLE_DEV_PM_OPS(name, suspend_fn, resume_fn) \
_DEFINE_DEV_PM_OPS(name, suspend_fn, resume_fn, NULL, NULL, NULL)
#define SYSTEM_SLEEP_PM_OPS(suspend_fn, resume_fn) \
.suspend = pm_sleep_ptr(suspend_fn), \
.resume = pm_sleep_ptr(resume_fn), \
.freeze = pm_sleep_ptr(suspend_fn), \
.thaw = pm_sleep_ptr(resume_fn), \
.poweroff = pm_sleep_ptr(suspend_fn), \
.restore = pm_sleep_ptr(resume_fn),
#define pm_sleep_ptr(_ptr) PTR_IF(IS_ENABLED(CONFIG_PM_SLEEP), (_ptr))
Under what circumstances does this change result in some difference?
--
i.
