lynxpoint: XHCI: Don't put device in D3 in _PS0 Method

The end of the _PS0 method that is supposed to transition the
XHCI device to D0 state is instead putting it in D3 state.

This triggers a PME_B0 GPE which causes a Notify to the XHCI
ACPI Device in the kernel and that increments the wakeup counter
and causes aborted suspends.

Instead if we just leave the device in D0 where it should be
after executing this function then the PME_B0 is not generated
and the kernel does not see a wakeup on XHCI.

Similarly I changed the _PS3 method to always put the device in
D3 at the end of the method, rather than depending on the state
to be D3 at the start.

Before this change the kernel would see the following sequence
when trying to suspend when the XHCI controller is in D3cold:

kernel: ACPI: Execute Method [\_SB_.PCI0.XHCI._PS0] (Node ffff88017802bf28)
kernel:   evmisc-0169 [07] ev_queue_notify_reques: Dispatching Notify on [XHCI] (Device) Value 0x02 (Device Wake) Node ffff88017802bc30
kernel:   evmisc-0169 [07] ev_queue_notify_reques: Dispatching Notify on [EHCI] (Device) Value 0x02 (Device Wake) Node ffff88017802b8e8
kernel:   evmisc-0169 [07] ev_queue_notify_reques: Dispatching Notify on [HDEF] (Device) Value 0x02 (Device Wake) Node ffff88017802b1b8
kernel: xhci_hcd 0000:00:14.0: power state changed by ACPI to D0
kernel: xhci_hcd 0000:00:14.0: PME# disabled
kernel: xhci_hcd 0000:00:14.0: enabling bus mastering
kernel: xhci_hcd 0000:00:14.0: setting latency timer to 64
kernel: PM: Wakeup pending, aborting suspend
kernel: last active wakeup source: 0000:00:14.0

Now it does not get a notification (due to PME_B0) when going to D0
on the way into suspend.  XHCI goes from D3cold to D0 (in order to
be able to read mmio) and then back to D3hot before suspend.

kernel: ACPI: Execute Method [\_SB_.PCI0.XHCI._PS0] (Node ffff88017802bf28)
kernel: xhci_hcd 0000:00:14.0: power state changed by ACPI to D0
kernel: xhci_hcd 0000:00:14.0: PME# disabled
kernel: xhci_hcd 0000:00:14.0: enabling bus mastering
kernel: xhci_hcd 0000:00:14.0: setting latency timer to 64
kernel: ACPI: Execute Method [\_SB_.PCI0.XHCI._S3D] (Node ffff88017802c000)
kernel: xhci_hcd 0000:00:14.0: PME# enabled
kernel: xhci_hcd 0000:00:14.0: System wakeup enabled by ACPI
kernel: ACPI: Execute Method [\_SB_.PCI0.XHCI._PS3] (Node ffff88017802bf50)
kernel: xhci_hcd 0000:00:14.0: power state changed by ACPI to D3hot

Change-Id: Id5cd28eede2b27d97640047feb17349ae4ab79b7
Signed-off-by: Duncan Laurie <dlaurie@chromium.org>
Reviewed-on: https://gerrit.chromium.org/gerrit/65236
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-on: http://review.coreboot.org/4448
Tested-by: build bot (Jenkins)
Reviewed-by: Patrick Georgi <patrick@georgi-clan.de>
1 file changed