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charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-i3c" Errors-To: linux-i3c-bounces+linux-i3c=archiver.kernel.org@lists.infradead.org On 8/9/2024 21:27, Andy Shevchenko wrote: > On Fri, Aug 09, 2024 at 09:02:35PM +0530, Shyam Sundar S K wrote: >> On 8/9/2024 19:48, Andy Shevchenko wrote: >>> On Fri, Aug 09, 2024 at 04:54:18PM +0300, Jarkko Nikula wrote: >>>> On 8/7/24 8:23 AM, Shyam Sundar S K wrote: > > ... > >>> When adding a new ACPI ID, always provide the following information: >>> >>> 1) link (in some form) to the official confirmation / documentation for >>> the allocated ID by the vendor (MIPI in this case) _OR_ (very exceptional!) >>> why the bad ID had been allocated; >> >> Member version: >> https://members.mipi.org/wg/All-Members/document/previewpdf/89465 >> >> Public version: https://www.mipi.org/mipi-disco-for-i3c-download (this >> requires a signup). >> >> Since there is no direct link available for preview, I did not include >> them in the commit-msg. But left a note that the MIPI ID is the one as >> specified in the MIPI DisCo spec. > > It's fine. > >>> 2) are there devices in the wild (on the market) that use the being added ID(s)? >> >> Not in the wild. But the latest platform will have this support >> included. So, these device IDs are crucial for the i3c-hci to be >> supported on AMD platforms. > > Good, let's do it right then! > >>> 3) excerpt from the device (independently if it's public already, see above, >>> or not) DSDT ACPI table. >>> >>> With the given patch it looks to me that you most likely need a local, AMD >>> specific ID as well. >>> >>> So, in my ideal world the DSDT should be like >>> >>> Device (I3CC) >>> { >>> Name (_HID, "...") // AMD specific _HID >>> Name (_CID, "MIPI0100") // Compatible ID for generic I3C controller >>> ... >>> } >>> >>> Is this the case? Why not? >> >> Please refer to the MIPI HCI I3C DisCo specification >> (https://members.mipi.org/wg/All-Members/document/previewpdf/89465) >> section 5.4. The ASL looks the same in case of AMD. >> >> MSFT says that they want to use MIPI0100 as mentioned in the >> specification. > > MIPI doesn't know how to assign the ACPI ID correctly. But again, what I put in > the above is the correct way of approaching. > >> What would you advise? > > Since my intuition and experience tells me that the two devices even based on > the same IP are not the same (see word 'quirk' or '.driver_data' or alike in > the kernel sources) the generic ID may not be used for the specific vendor > unless it's _the only_ vendor for the certain IP. > > So, please do as I suggested above. And file a error report (and correction > proposal) to the MIPI, so in "5.1 I3C Host Controller ACPI Hardware ID (_HID)" Thank you. I shall file a error report soon to get it corrected. > they should use _CID instead of _HID and add some text like > "Each vendor should dedicate it's own _HID for the platform in question. The > same _HID as _CID may be used if and only if vendor guarantees that there 100% > compatibility with MIPI as described in this and other related documents." > > I.o.w. do you 100% guarantee that MIPI HCI I3C DisCo covers all necessary > properties that you need for _your_ hardware? If not, use my approach, if yes, > use the same _HID *and* _CID. > > Microsoft should know this as well and much better than MIPI. > Agree with your thoughts. I will respin based on your remarks after internal discussion. If it requires _HID to be MIPI0100, I will come back with answers. Thanks, Shyam -- linux-i3c mailing list linux-i3c@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-i3c