Thanks for the additional information.
The call to iosf_mbi_read() returns 0x400b0100
/* bits 26:27 mirror PMIC options */
bios_status = (bios_status >> 26) & 3;
Results in bios_status = 0x0
So that's a fail.
The stock kernel printed this on every startup:
SPID updated according to ACPI Table:
spid customer id : 0000
spid vendor id : 0000
spid manufacturer id : 00ff
spid platform family id : 0007 --> INTEL_BYT_TABLET
spid product line id : 0000 --> INTEL_BYT_TABLET_BLK_PRO
spid hardware id : 0004 --> BYT_TABLET_BLK_8PR0 /* Bay Lake FFRD-8 PR0 */
spid fru[4..0] : 00 00 00 00 00
spid fru[9..5] : 00 00 00 00 00
Based on spid.h [1] I added the "-->" above. Then I guessed that this is
BYT-T (there is another "BYT T CR V2" value), but to be honest I don't
know for sure.
[1]: https://github.com/me176c-dev/me176c-kernel/blob/stock/kernel/arch/x86/include/asm/spid.h
Oh man, Bay Lake...this must be at least 6 years old and 30+ kernel
versions behind... Only a couple of years and it'll be a collector item :-)
I can't recall any of the details so we'll have to wing it. it could be
that it was baytrail-T but with the software/BIOS for Baytrail-Cr, who
knows.
I don't mean to dismiss your claim, just want to find out if this is a case
where the PMIC-type-based byt_cr detection fails or if we have a BIOS issue.
Another smoking gun is if you find in your code traces of SSP0 being used.
The quirks to get sound working with bytcr-rt5640 on that device are:
BYT_RT5640_SSP0_AIF1 | BYT_RT5640_IN1_MAP | BYT_RT5640_MCLK_EN
I guess this means that SSP0 is being used?
Yes indeed, and that makes me think we should force this device to look
like Baytrail-CR.
You can do this with a DMI-based quirk (preferably in is_byt_cr directly
so that I can reuse the code when I move it to a helper at some point).
Also I guess you'd need a second quirk in bytcr_rt5640 since the default
is SSP0-AIF2.
-Pierre
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