linux-kernel - Re: [PATCH 1/2] platform/x86: amd-pmc: Add alternative acpi id for PMC controller

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Message-ID: <909f28e9-245a-df90-52f1-98b0f63a2b3a@amd.com>
Date:   Thu, 7 Oct 2021 15:00:23 -0500
From:   "Limonciello, Mario" <mario.limonciello@....com>
To:     Shyam Sundar S K <Shyam-sundar.S-k@....com>,
        Sachi King <nakato@...ato.io>, hdegoede@...hat.com,
        mgross@...ux.intel.com, rafael@...nel.org, lenb@...nel.org,
        Sanket.Goswami@....com
Cc:     platform-driver-x86@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-acpi@...r.kernel.org, stable@...r.kernel.org
Subject: Re: [PATCH 1/2] platform/x86: amd-pmc: Add alternative acpi id for
 PMC controller

+Sanket Goswami

On 10/5/2021 00:16, Shyam Sundar S K wrote:
> 
> 
> On 10/2/2021 9:48 AM, Sachi King wrote:
>> The Surface Laptop 4 AMD has used the AMD0005 to identify this
>> controller instead of using the appropriate ACPI ID AMDI0005.  Include
>> AMD0005 in the acpi id list.
> 
> Can you provide an ACPI dump and output of 'cat /sys/power/mem_sleep'
> 
> Thanks,
> Shyam
> 

I had a look through the acpidump listed there and it seems like the PEP
device is filled with a lot of NO-OP type of code.  This means the LPS0 
patch really isn't "needed", but still may be a good idea to include for 
completeness in case there ends up being a design based upon this that 
does need it.

As for this one (the amd-pmc patch) how are things working with it? 
Have you checked power consumption and verified that the amd_pmc debugfs 
statistics are increasing?  Is the system able to resume from s2idle?

Does pinctrl-amd load on this system?  It seems to me that the power 
button GPIO doesn't get used like normally on "regular" UEFI based AMD 
systems.  I do see MSHW0040 so this is probably supported by 
surfacepro3-button and that will probably service all the important events.