[alsa-devel] [PATCH] cmipci at 96kHz
Timofei V. Bondarenko
tim at ipi.ac.ru
Tue Oct 30 15:22:50 CET 2007
Clemens Ladisch wrote:
> Timofei V. Bondarenko wrote:
>> This patch adds support for 88.2k, 96k, and 128k samplerates
>> on cmi8738-55 chip.
>> Analog playback works fine on all channels.
>> Analog capture works well too, though the extra samples seems
>> interpolated by hardware.
>> spdif playback and capture works fine.
>> + freq_ext = CM_CH0_SRATE_88K | CM_CH0_SRATE_96K;
> I'd guess there should be a new symbol CM_CH0_SRATE_128K.
Ok. One more one-time-use symbol.
>> + case 88200:
>> + freq = 44100;
>> + case 96000:
>> + freq = 48000;
>> + case 128000:
>> + freq = 32000; /* not matter,
> Wouldn't it be simpler to divide freq by two in all three cases?
Not so easy, 128/2 = 64 - is an invalid rate,
snd_cmipci_rate_freq() will complain.
On another hand an invalid 64k/2=32k (valid) - this make snd_BUG() in
If the '68 chip also don't care about CM_REG_FUNCTRL1:ASFC/DSFC then
freq can be set to 0 for all doubled frequencies.
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