linux-kernel - Re: Re：Re: [PATCH 3/3] arm_scpi: modify to support acpi

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Date:   Fri, 25 Nov 2022 09:54:38 +0000
From:   Sudeep Holla <sudeep.holla@....com>
To:     王洪辉 <honghui.wang@...s.com.cn>
Cc:     Hanjun Guo <guohanjun@...wei.com>,
        Mark Rutland <mark.rutland@....com>,
        Sudeep Holla <sudeep.holla@....com>,
        Cristian Maruss <cristian.marussi@....com>,
        Jassi Brar <jassisinghbrar@...il.com>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: Re：Re: [PATCH 3/3] arm_scpi:
 modify to support acpi

On Fri, Nov 25, 2022 at 09:38:42AM +0800, Hanjun Guo wrote:
> Hi Honghui,
> 
> On 2022/11/24 22:17, 锟斤拷锟斤拷锟? wrote:
> > Thanks!
> > 
> > The uefi firmware was built include ACPI/AML, but current kernel code is
> > not able to extract the info, the ACPI/AML driver of kernel is not enough
> > for majority of  devices , but fdt driver is. I think there's a lot of
> > work to support more acpi driver.
> 
> I think the firmware did the wrong thing about SCPI support,
> please take a look at ACPI 6.5, chapter 14 Platform Communications
> Channel (PCC).
>

Thanks Hanjun for pin pointing the exact references in the ACPI spec.

Hi Wang,

You seemed to be posting random patches to add SCPI support in ACPI.
You will get a NACK on all unless you explore PCC and PCC OpRegion in
ACPI and update your firmware to make it work on your platform.
You had sent a patch updating the mailbox driver which is not present
in the upstream. You must not need that driver when you use PCCT in
the ACPI firmware, so please drop the driver and any changes to that
as well. Without seeing the actual driver you are using with SCPI, I
can't help much on how to use it with PCC. Please refer chapter 14 as
Hanjun mention and check how to write one to your platform. Think
PCCT as mailbox node equivalent in DT and you *must not* just add similar
node in your ACPI DSDT with some custom HID/CID.

Hope this helps and gives you better idea on the suggestions made so far.

-- 
Regards,
Sudeep