On Mon, Dec 17, 2018 at 01:39:13PM -0600, Pierre-Louis Bossart wrote:
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.
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 :-)
Yeah, the device was shipped with a 3.10 kernel but I believe that file was just copied from an earlier 3.4 kernel. I have never bothered to even try to compile that thing, I just use it as reference every now and then. :)
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).
Okay - thanks! One last question: I was looking at the ACPI DSDT tables of some similar devices and have found two others that look the same (only one IRQ listed). In this case, the BYT-T acpi_ipc_irq_index = 5 will never work, and we will definitely have a better chances with trying Baytrail-CR.
One of them actually had a similar patch proposed at [1] (although they did it in a weird way and also need an extra machine driver).
We could also detect this situation in a generic way with something like
if (platform_irq_count(pdev) == 1) { *bytcr = true; return 0; }
... instead of a DMI quirk. What do you think?
[1]: https://patchwork.kernel.org/patch/9764493/#20539549
Also I guess you'd need a second quirk in bytcr_rt5640 since the default is SSP0-AIF2.
-Pierre