[coreboot] WOL/PCI PME wakeup from S3 Baytrail SoC (Bayleybay CRB)

[WANG FEI]

Guilu,

About the item 2, please refer to
https://www.pcisig.com/specifications/conventional/pcipm1.2.pdf, chapter 3,
my experience is based on this spec. I bet PCIE devices should be
compatible with this doc.

This doc will focus on PCI/PCIE devices behind PCI/PCIE bridges/root ports,
it's described how to configure the PCI/PCIE devices to wake themselves
from PME signals. This job suppose to be done before system
sleep(S1/S3/S4/S5).

-Fei

On Fri, Nov 28, 2014 at 6:42 AM, Gailu Singh <gailu96 at gmail.com> wrote:

> Hi Wang Fei,
>
> Thank you very much for your help. I checked the things you suggested but
> still it does not work. Here are some details.
>
> >>1) SoC ACPI registers: Enable PCIE PME in PM and GPE registers.
>             You are right  PCIE Wake was disabled in smm.c I enabled it
>                 - enable_pm1(PWRBTN_EN | GBL_EN | PCIEXPWAK_DIS);
>                 + enable_pm1(PWRBTN_EN | GBL_EN);
>              I Enabled GPE registers as well
>                 + enable_gpe(PCI_EXP_EN | PCIE_WAKE1_EN | PCIE_WAKE2_EN |
> SUS_GPIO_EN1 | SUS_GPIO_EN2);
>
> >>3) Report WOL PME single in ASL _GPE{} with _Lxx method
>              I have _Lxx methods in GPE as below
>                 Method(_L11) {
>                     Notify(PWRB, 0x02) /* NOTIFY_DEVICE_WAKE */
>                 }
>
> >> 4) (Option) If WOL PME single connect a GPIO, you have to configure
> GPIO pin as well.
>              I tried configuring GPIO in gpio.c as GPIO_ACPI_WAKE and
> GPIO_ACPI_SCI
>              - GPIO_DEFAULT,           /* GPIO_S5[01] */
>              - GPIO_DEFAULT,           /* GPIO_S5[02] */
>              + GPIO_ACPI_WAKE,     /* GPIO_S5[01] */
>              + GPIO_ACPI_WAKE,     /* GPIO_S5[02] */
>
> >>2) PCIE Card ACPI register: Yeah, you need set some registers of the
> PCIE card to allow it waked by packages.
>         I am not clear about this. Can you please elaborate little more on
> this. Do I need it to wake SoC or is it required for SoC to wake PCIe card
> after resume? From power button resume card works fine post resume.
>
> Am I doing something wrong in the first three things you suggested?
>
> Best Regards
>
> On Wed, Nov 26, 2014 at 8:33 PM, WANG FEI <wangfei.jimei at gmail.com> wrote:
>
>> I remember WOL PME wakeup function need configure 3-4 different areas,
>>
>> 1) SoC ACPI registers: Enable PCIE PME in PM and GPE registers.
>>
>> 2) PCIE Card ACPI register: Yeah, you need set some registers of the PCIE
>> card to allow it waked by packages.
>>
>> 3) Report WOL PME single in ASL _GPE{} with _Lxx method
>>
>> 4) (Option) If WOL PME single connect a GPIO, you have to configure GPIO
>> pin as well.
>>
>> Please check your code and see if anything missed.
>>
>> On Tue, Nov 25, 2014 at 2:27 PM, Gailu Singh <gailu96 at gmail.com> wrote:
>>
>>> Hi Sean,
>>>
>>> Thanks for your help and showing me the direction. You are right GPIO
>>> pins for PMC_WAKE_PCIE were set to GPIO_DEFAULT in
>>> src/mainboard/intel/bayleybay_fsp/gpio.c. I have changed that to
>>> GPIO_ACPI_WAKE now. This seems to be one step closer to the solution but
>>> looks like something still missing as wakeup from PCIE device is still not
>>> working with coreboot. Any other thing that I should look at?
>>>
>>> Best Regards
>>>
>>> >>Perhaps you do not have all your GPIO pins set properly.
>>>
>>> On Mon, Nov 24, 2014 at 5:04 PM, Gailu Singh <gailu96 at gmail.com> wrote:
>>>
>>>> Hi Experts,
>>>>
>>>> I have PCIe card that supports wake on lan and it works fine with BIOS.
>>>> On sending magic packet System wakes up from S3.
>>>>
>>>> However If I use same Linux image with coreboot wake from PCI device
>>>> does not wake the system. System wakes up from S3 using power button only.
>>>>
>>>> I suspected the problem with dsdt and took dsdt binary from bios setup,
>>>> disassembled it and replaced dsdt.asl in coreboot with the one from bios to
>>>> match dsdt configuration. Now my dsdt and linux image are same but still
>>>> system does not wake from PCI PME (WOL) in coreboot but works fine with
>>>> bios.
>>>>
>>>> In both cases wakeup is enabled in
>>>> /sys/bus/pci/devices/0000\:01\:00.0/power/wakeup
>>>>
>>>> Can you please advise what else could be the problem?
>>>>
>>>> PME signal is connected to GPIOS5 on the SoC.
>>>>
>>>> Best Regards
>>>>
>>>>
>>>
>>> --
>>> coreboot mailing list: coreboot at coreboot.org
>>> http://www.coreboot.org/mailman/listinfo/coreboot
>>>
>>
>>
>
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