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SubjectRe: [PATCH] ACPI / LPSS: Avoid PM quirks on suspend and resume from S3
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On Tuesday, July 24, 2018 11:13:42 AM CEST Rafael J. Wysocki wrote:
> On Tuesday, July 24, 2018 10:46:09 AM CEST Kai Heng Feng wrote:
> > Hi Rafael,
> >
> > > On Jun 13, 2018, at 7:17 PM, Rafael J. Wysocki <rjw@rjwysocki.net> wrote:
> > >
> > > From: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
> > >
> > > It is reported that commit a192aa923b66a (ACPI / LPSS: Consolidate
> > > runtime PM and system sleep handling) introduced a system suspend
> > > regression on some machines, but the only functional change made by
> > > it was to cause the PM quirks in the LPSS to also be used during
> > > system suspend and resume. While that should always work for
> > > suspend-to-idle, it turns out to be problematic for S3
> > > (suspend-to-RAM).
> > >
> > > To address that issue restore the previous S3 suspend and resume
> > > behavior of the LPSS to avoid applying PM quirks then.
> >
> > The users reported that this patch does fix the S3 issue, but the S4 still
> > fails.
> >
> > Please refer to [1] for more for user's testing result.
> >
> > [1] https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1774950/comments/60
>
> Please ask the users to test the patch below, then, on top of the $subject one.

There was a mistake in the previous patch I posted, sorry about that.

Please test this one instead:

---
drivers/acpi/acpi_lpss.c | 26 +++++++++++++++++---------
1 file changed, 17 insertions(+), 9 deletions(-)

Index: linux-pm/drivers/acpi/acpi_lpss.c
===================================================================
--- linux-pm.orig/drivers/acpi/acpi_lpss.c
+++ linux-pm/drivers/acpi/acpi_lpss.c
@@ -879,6 +879,7 @@ static void acpi_lpss_dismiss(struct dev
#define LPSS_GPIODEF0_DMA_LLP BIT(13)

static DEFINE_MUTEX(lpss_iosf_mutex);
+static bool lpss_iosf_d3_entered;

static void lpss_iosf_enter_d3_state(void)
{
@@ -921,6 +922,9 @@ static void lpss_iosf_enter_d3_state(voi

iosf_mbi_modify(LPSS_IOSF_UNIT_LPIOEP, MBI_CR_WRITE,
LPSS_IOSF_GPIODEF0, value1, mask1);
+
+ lpss_iosf_d3_entered = true;
+
exit:
mutex_unlock(&lpss_iosf_mutex);
}
@@ -935,6 +939,11 @@ static void lpss_iosf_exit_d3_state(void

mutex_lock(&lpss_iosf_mutex);

+ if (!lpss_iosf_d3_entered)
+ goto exit;
+
+ lpss_iosf_d3_entered = false;
+
iosf_mbi_modify(LPSS_IOSF_UNIT_LPIOEP, MBI_CR_WRITE,
LPSS_IOSF_GPIODEF0, value1, mask1);

@@ -944,13 +953,13 @@ static void lpss_iosf_exit_d3_state(void
iosf_mbi_modify(LPSS_IOSF_UNIT_LPIO1, MBI_CFG_WRITE,
LPSS_IOSF_PMCSR, value2, mask2);

+exit:
mutex_unlock(&lpss_iosf_mutex);
}

-static int acpi_lpss_suspend(struct device *dev, bool runtime)
+static int acpi_lpss_suspend(struct device *dev, bool wakeup)
{
struct lpss_private_data *pdata = acpi_driver_data(ACPI_COMPANION(dev));
- bool wakeup = runtime || device_may_wakeup(dev);
int ret;

if (pdata->dev_desc->flags & LPSS_SAVE_CTX)
@@ -963,14 +972,14 @@ static int acpi_lpss_suspend(struct devi
* wrong status for devices being about to be powered off. See
* lpss_iosf_enter_d3_state() for further information.
*/
- if ((runtime || !pm_suspend_via_firmware()) &&
+ if (acpi_target_system_state() == ACPI_STATE_S0 &&
lpss_quirks & LPSS_QUIRK_ALWAYS_POWER_ON && iosf_mbi_available())
lpss_iosf_enter_d3_state();

return ret;
}

-static int acpi_lpss_resume(struct device *dev, bool runtime)
+static int acpi_lpss_resume(struct device *dev)
{
struct lpss_private_data *pdata = acpi_driver_data(ACPI_COMPANION(dev));
int ret;
@@ -979,8 +988,7 @@ static int acpi_lpss_resume(struct devic
* This call is kept first to be in symmetry with
* acpi_lpss_runtime_suspend() one.
*/
- if ((runtime || !pm_resume_via_firmware()) &&
- lpss_quirks & LPSS_QUIRK_ALWAYS_POWER_ON && iosf_mbi_available())
+ if (lpss_quirks & LPSS_QUIRK_ALWAYS_POWER_ON && iosf_mbi_available())
lpss_iosf_exit_d3_state();

ret = acpi_dev_resume(dev);
@@ -1004,12 +1012,12 @@ static int acpi_lpss_suspend_late(struct
return 0;

ret = pm_generic_suspend_late(dev);
- return ret ? ret : acpi_lpss_suspend(dev, false);
+ return ret ? ret : acpi_lpss_suspend(dev, device_may_wakeup(dev));
}

static int acpi_lpss_resume_early(struct device *dev)
{
- int ret = acpi_lpss_resume(dev, false);
+ int ret = acpi_lpss_resume(dev);

return ret ? ret : pm_generic_resume_early(dev);
}
@@ -1024,7 +1032,7 @@ static int acpi_lpss_runtime_suspend(str

static int acpi_lpss_runtime_resume(struct device *dev)
{
- int ret = acpi_lpss_resume(dev, true);
+ int ret = acpi_lpss_resume(dev);

return ret ? ret : pm_generic_runtime_resume(dev);
}
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