linux-kernel - Re: [PATCH v4 1/6] i3c: mipi-i3c-hci: Add AMDI5017 ACPI ID to the I3C Support List

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Message-ID: <a1393cc5-f409-4d0e-a4a1-5eed61c43ea3@amd.com>
Date: Wed, 21 Aug 2024 22:52:08 +0530
From: Shyam Sundar S K <Shyam-sundar.S-k@....com>
To: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Cc: Alexandre Belloni <alexandre.belloni@...tlin.com>,
 Jarkko Nikula <jarkko.nikula@...ux.intel.com>,
 Guruvendra Punugupati <Guruvendra.Punugupati@....com>,
 Krishnamoorthi M <krishnamoorthi.m@....com>, linux-i3c@...ts.infradead.org,
 linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 1/6] i3c: mipi-i3c-hci: Add AMDI5017 ACPI ID to the I3C
 Support List



On 8/21/2024 21:13, Andy Shevchenko wrote:
> On Wed, Aug 21, 2024 at 06:42:13PM +0300, Andy Shevchenko wrote:
>> On Wed, Aug 21, 2024 at 06:39:04PM +0300, Andy Shevchenko wrote:
>>> On Wed, Aug 21, 2024 at 08:42:12PM +0530, Shyam Sundar S K wrote:
>>>> On 8/21/2024 19:26, Andy Shevchenko wrote:
>>>>> On Wed, Aug 21, 2024 at 07:07:45PM +0530, Shyam Sundar S K wrote:
>>>>>> On 8/21/2024 19:05, Shyam Sundar S K wrote:
> 
> ...
> 
>>>>>>> This update adds the AMDI5017 ACPI ID to the list of supported IDs.
>>>
>>> s/This update adds/Add/
>>>
>>>>> Please, provide a DSDT excerpt to show how it will look like in the ACPI
>>>>> tables.
>>>>
>>>>     Scope (_SB)
>>>>     {
>>>> 	...
>>>>
>>>>         Name (HCID, "AMDI5017")
>>>>         Device (I3CA)
>>>>         {
>>>>             Method (_HID, 0, Serialized)  // _HID: Hardware ID
>>>>             {
>>>>                 If ((I30M == Zero))
>>>>                 {
>>>>                     If (CondRefOf (HCIB))
>>>>                     {
>>>>                         Return (HCID) /* \_SB_.HCID */
>>>>                     }
>>>>                     Else
>>>>                     {
>>>>                         Return (I3ID) /* \_SB_.I3ID */
>>>
>>> Do I understand correctly that I3ID is the old one (as per another path I have
>>> seen last week or so), i.o.w. *not* a MIPI allocated one?
>>>
>>> If it's the case, feel free to add
>>> Reviewed-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
>>> from ACPI ID perspective.
>>
>> Regarding MIPI ID and using it as a _CID is kinda unsolved now, in any case
>> _CID *requires* _HID to be present, and hence _HID has a priority in
>> enumeration. It doesn't matter if it's absent now (it's even more flexible in
> 
> Just to be crystal clear
> 
>  "It doesn't matter if _CID is absent now..."

Thanks! yeah, and that's right. I have left this decision to my BIOS
peers.

btw, I have notified MIPI about this error in the MIPI I3C DisCo
Specification.

Thanks,
Shyam

> 
>> case MIPI decides to use _another_ ID for _CID) as long as software uses
>> _HID for enumeration.
>>
>>>>                     }
>>>>                 }
>>>>                 Else
>>>>                 {
>>>>                     Return (I2ID) /* \_SB_.I2ID */
>>>>                 }
>>>>             }
>>>> 	
>>>> 	...
>>>>     }
>