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SubjectRe: [PATCH] ACPI / LPSS: Don't skip late system PM ops for hibernate on BYT/CHT
Date
On Thursday, April 25, 2019 6:38:34 PM CEST Robert R. Howell wrote:
> On 4/24/19 1:20 AM, Rafael J. Wysocki wrote:
>
> > On Tue, Apr 23, 2019 at 10:03 PM Robert R. Howell <RHowell@uwyo.edu> wrote:
> >>
> >> On 4/23/19 2:07 AM, Rafael J. Wysocki wrote:
> >>>
> >>> On Sat, Apr 20, 2019 at 12:44 AM Robert R. Howell <RHowell@uwyo.edu> wrote:
> >>>>
> >>>> On 4/18/19 5:42 AM, Hans de Goede wrote:
> >>>>
> >>>>>> On 4/8/19 2:16 AM, Hans de Goede wrote:>
> >>>>>>>
> >>>>>>> Hmm, interesting so you have hibernation working on a T100TA
> >>>>>>> (with 5.0 + 02e45646d53b reverted), right ?
> >>>>>>>
> >>>>
> >>>>
> >>>> I've managed to find a way around the i2c_designware timeout issues
> >>>> on the T100TA's. The key is to NOT set DPM_FLAG_SMART_SUSPEND,
> >>>> which was added in the 02e45646d53b commit.
> >>>>
> >>>> To test that I've started with a 5.1-rc5 kernel, applied your recent patch
> >>>> to acpi_lpss.c, then apply the following patch of mine, removing
> >>>> DPM_FLAG_SMART_SUSPEND. (For the T100 hardware I need to apply some
> >>>> other patches as well but those are not related to the i2c-designware or
> >>>> acpi issues addressed here.)
> >>>>
> >>>> On a resume from hibernation I still see one error:
> >>>> "i2c_designware 80860F41:00: Error i2c_dw_xfer called while suspended"
> >>>> but I no longer get the i2c_designware timeouts, and audio does now work
> >>>> after the resume.
> >>>>
> >>>> Removing DPM_FLAG_SMART_SUSPEND may not be what you want for other
> >>>> hardware, but perhaps this will give you a clue as to what is going
> >>>> wrong with hibernate/resume on the T100TA's.
> >>>
> >>> What if you drop DPM_FLAG_LEAVE_SUSPENDED alone instead?
> >>>
> >>
> >> I did try dropping just DPM_FLAG_LEAVE_SUSPENDED, dropping just
> >> DPM_FLAG_SMART_SUSPEND, and dropping both flags. When I just drop
> >> DPM_FLAG_LEAVE_SUSPENDED I still get the i2c_designware timeouts
> >> after the resume. If I drop just DPM_FLAG_SMART_SUSPEND or drop both,
> >> then the timeouts go away.
> >
> > OK, thanks!
> >
> > Is non-hibernation system suspend affected too?
>
> I just ran some tests on a T100TA, using the 5.1-rc5 code with Hans' patch applied
> but without any changes to i2c-designware-platdrv.c, so the
> DPM_FLAG_SMART_PREPARE, DPM_FLAG_SMART_SUSPEND, and DPM_FLAG_LEAVE_SUSPENDED flags
> are all set.
>
> Suspend does work OK, and after resume I do NOT get any of the crippling
> i2c_designware timeout errors which cause sound to fail after hibernate. I DO see one
> "i2c_designware 80860F41:00: Error i2c_dw_xfer call while suspended"
> error on resume, just as I do on hibernate. I've attached a portion of dmesg below.
> The "asus_wmi: Unknown key 79 pressed" error is a glitch which occurs
> intermittently on these machines, but doesn't seem related to the other issues.
> I had one test run when it was absent but the rest of the messages were the
> same -- but then kept getting that unknown key error on all my later tries.
>
> I did notice the "2sidle" in the following rather than "shallow" or "deep". A
> cat of /sys/power/state shows "freeze mem disk" but a
> cat of /sys/power/mem_sleep" shows only "[s2idle] so it looks like shallow and deep
> are not enabled for this system. I did check the input power (or really current)
> as it went into suspend and the micro-usb power input drops from about
> 0.5 amps to 0.05 amps. But clearly a lot of devices are still active, as movement
> of a bluetooth mouse (the MX Anywhere 2) will wake it from suspend. That presumably is
> why suspend doesn't trigger the same i2c_designware problems as hibernate.
>
> Let me know if I can do any other tests.

Can you please check if the appended patch makes the hibernate issue go away for you, without any other changes?

---
drivers/pci/pci-driver.c | 36 ++++++++++--------------------------
1 file changed, 10 insertions(+), 26 deletions(-)

Index: linux-pm/drivers/pci/pci-driver.c
===================================================================
--- linux-pm.orig/drivers/pci/pci-driver.c
+++ linux-pm/drivers/pci/pci-driver.c
@@ -957,15 +957,14 @@ static int pci_pm_freeze(struct device *
}

/*
- * This used to be done in pci_pm_prepare() for all devices and some
- * drivers may depend on it, so do it here. Ideally, runtime-suspended
- * devices should not be touched during freeze/thaw transitions,
- * however.
+ * Resume all runtime-suspended devices before creating a snapshot
+ * image of system memory, because the restore kernel generally cannot
+ * be expected to always handle them consistently and pci_pm_restore()
+ * always leaves them as "active", so ensure that the state saved in the
+ * image will always be consistent with that.
*/
- if (!dev_pm_smart_suspend_and_suspended(dev)) {
- pm_runtime_resume(dev);
- pci_dev->state_saved = false;
- }
+ pm_runtime_resume(dev);
+ pci_dev->state_saved = false;

if (pm->freeze) {
int error;
@@ -992,9 +991,6 @@ static int pci_pm_freeze_noirq(struct de
struct pci_dev *pci_dev = to_pci_dev(dev);
struct device_driver *drv = dev->driver;

- if (dev_pm_smart_suspend_and_suspended(dev))
- return 0;
-
if (pci_has_legacy_pm_support(pci_dev))
return pci_legacy_suspend_late(dev, PMSG_FREEZE);

@@ -1024,16 +1020,6 @@ static int pci_pm_thaw_noirq(struct devi
struct device_driver *drv = dev->driver;
int error = 0;

- /*
- * If the device is in runtime suspend, the code below may not work
- * correctly with it, so skip that code and make the PM core skip all of
- * the subsequent "thaw" callbacks for the device.
- */
- if (dev_pm_smart_suspend_and_suspended(dev)) {
- dev_pm_skip_next_resume_phases(dev);
- return 0;
- }
-
if (pcibios_pm_ops.thaw_noirq) {
error = pcibios_pm_ops.thaw_noirq(dev);
if (error)
@@ -1093,8 +1079,10 @@ static int pci_pm_poweroff(struct device

/* The reason to do that is the same as in pci_pm_suspend(). */
if (!dev_pm_test_driver_flags(dev, DPM_FLAG_SMART_SUSPEND) ||
- !pci_dev_keep_suspended(pci_dev))
+ !pci_dev_keep_suspended(pci_dev)) {
pm_runtime_resume(dev);
+ pci_dev->state_saved = false;
+ }

pci_dev->state_saved = false;
if (pm->poweroff) {
@@ -1168,10 +1156,6 @@ static int pci_pm_restore_noirq(struct d
struct device_driver *drv = dev->driver;
int error = 0;

- /* This is analogous to the pci_pm_resume_noirq() case. */
- if (dev_pm_smart_suspend_and_suspended(dev))
- pm_runtime_set_active(dev);
-
if (pcibios_pm_ops.restore_noirq) {
error = pcibios_pm_ops.restore_noirq(dev);
if (error)


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