audiohw_set_monitor() switched the output mixer from the DAC to both line
bypasses: voice and beeps went silent while the radio played, and a line
nobody listened to was mixed in, with its noise. Both line inputs were
also powered from start-up on.
- the target names the line its tuner is on, RK27XX_CODEC_FM_LINE (1 or
2); both are used where it does not say
- monitoring adds that line's bypass to the DAC instead of replacing it
- the line inputs stay in standby until monitored, and go back after
Only rk27generic uses the internal codec - the other rk27xx targets
have external DACs or codecs.
Tested on rk27generic: the radio plays through the monitored line, key
clicks stay audible over it, and playback is unaffected.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Change-Id: I177fdf605e4d997159898c868b2186c9584eb19a
19caf27567