Hello,

we're currently trying to get the new bytcr_rt5651 driver to run on a
TrekStor SurfTab wintron 7.0 (x86 tablet).

Unlike the previous driver for the rt5640 chipset, the new bytcr_rt5651
driver actually detects the card out-of-the-box.

This is the dmesg output on the device:
bytcr_rt5651: snd-soc-dummy-dai <-> media-cpu-dai mapping ok
bytcr_rt5651: snd-soc-dummy-dai <-> deepbuffer-cpu-dai mapping ok
bytcr_rt5651: Invalid direction for compress P 0, C 0
bytcr_rt5651: ASoC: can't create compress Compress
bytcr_rt5651: ASoC: failed to instantiate card -22
bytcr_rt5651: devm_snd_soc_register_card failed -22
bytcr_rt5651: probe of bytcr_rt5651 failed with error -22

So -- apparently it is successfully initializing 2 of the DAIs, but it
can't find the Compress-DAI. My first guess would just be to try and
disable the Compress DAI in the code just for debugging, but I'm sure
that there's a better way.

I'm running a bleeding edge kernel build from the main linux git tree,
build from yesterday's github.com/torvalds/linux.git repo.

Does anyone have any ideas on how to get alsa to detect the card properly?

Here's the complete dmesg output:
https://gist.github.com/Manawyrm/70d90e95e9c578a7fb26

Attached is a (binary) dump of the ACPI tables of the device.

Best regards,
Tobias Schramm and Tobias Mädel
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Tobias Mädel
t.maedel@alfeld.de
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