Re: [alsa-devel] [PATCH alsa-lib] ucm: Do not fail to parse configs on cards with an empty CardComponents lists

Dne 03. 12. 19 v 18:27 Hans de Goede napsal(a):

Since the UCM profiles for all Bay- and Cherry-Trail SST cards have been moved over to UCM2, parsing them fails with:

ALSA lib ucm_subs.c:220:(uc_mgr_get_substituted_value) variable '${CardComponents}' is not defined in this context!

This completely breaks audio support on all Bay- and Cherry-Trail devices.

This is caused by these non-SOF ASoC using cards having an empty CardComponents list. Which in itself is fine, but is rejected by the ucm_subs.c code. This commit changes the ucm_subs code to accept an empty string as a valid value for CardComponents restoring audio functionality on these boards.

I applied this patch to the alsa-lib repo. Thank you for this fix.

Jaroslav