Patch set updated for coreboot: ed1eec1 lynxpoint: XHCI: Advertise D3 as lowest wake state

[Patrick Georgi]

Patrick Georgi ([e-mail]) just uploaded a new patch set to gerrit, which you can find at http://review.coreboot.org/4409

-gerrit

commit ed1eec1a20b1602b0c8cf104eab64860c99b3f6a
Author: Duncan Laurie 
Date:   Tue Jul 30 16:15:14 2013 -0700

lynxpoint: XHCI: Advertise D3 as lowest wake state

The recommended value in docs is D2, but lynxpoint XHCI does not even
    support D2 state which causes the kernel to think this device cannot
    be used as a wake source:

kernel: xhci_hcd 0000:00:14.0: System wakeup enabled by ACPI
    kernel: ACPI: Device does not support D2
    kernel: xhci_hcd 0000:00:14.0: System wakeup disabled by ACPI

Additionally this means the kernel will never put the device into D3
    state by itself.  There is SMI code that will put the device into D3
    before suspend so advertising D3 here should be correct.

With this change the kernel will put the controller into D3 on suspend
    and back to D0 on resume, including executing the ACPI methods
    for _PS0/_PS3 that contain chipset specific workarounds.

In addition add a _PSC method to directly return the D state from the
    device registers.  With ALL USB devices removed the XHCI controller
    goes into D3 state and the kernel can have a hard time determining
    the state of the device at boot.

A kernel compiled with CONFIG_ACPI_DEBUG=y and module parameters
    acpi.debug_layer=0x7f acpi.debug_level=0x2f can be used to see
    what ACPI methods are executed:

kernel: xhci_hcd 0000:00:14.0: System wakeup enabled by ACPI
    kernel: ACPI: Execute Method [_SB_.PCI0.XHCI._PS3] (Node ffff8801000a7f50)
    kernel: ACPI: Preparing to enter system sleep state S3
    ...
    kernel: ACPI: Waking up from system sleep state S3
    kernel: ACPI: Execute Method [_SB_.PCI0.XHCI._PS0] (Node ffff8801000a7f28)
    kernel: xhci_hcd 0000:00:14.0: power state changed by ACPI to D0

Change-Id: Ic64040eb4dd1947a1e2f0ee253a64be683e0ec70
    Signed-off-by: Duncan Laurie

meld with s3d

Change-Id: Ic6789720c4efe661dcb03a4afce8d88115854472
    Reviewed-on: https://gerrit.chromium.org/gerrit/63916
    Tested-by: Duncan Laurie 
    Reviewed-by: Aaron Durbin 
    Commit-Queue: Duncan Laurie 
---
 src/southbridge/intel/lynxpoint/acpi/usb.asl | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/src/southbridge/intel/lynxpoint/acpi/usb.asl b/src/southbridge/intel/lynxpoint/acpi/usb.asl
index 1a0ad34..c22dbb8 100644
--- a/src/southbridge/intel/lynxpoint/acpi/usb.asl
+++ b/src/southbridge/intel/lynxpoint/acpi/usb.asl
@@ -238,6 +238,11 @@ Device (XHCI)
    	LPCL ()
    }

+	Method (_PSC, 0, NotSerialized)
+	{
+		Return (^D0D3)
+	}
+
    Method (_PS0, 0, Serialized)
    {
    	If (LEqual (^DVID, 0xFFFF)) {
@@ -375,12 +380,12 @@ Device (XHCI)

Method(_S3D,0)	// Highest D State in S3 State
    {
-		Return (2)
+		Return (3)
    }

Method(_S4D,0)	// Highest D State in S4 State
    {
-		Return (2)
+		Return (3)
    }

Device (HUB7)