[alsa-devel] [PATCH] Allow to switch hardware sampe rate on EMU

[Mihail Zenkov]

2013/2/25, Takashi Iwai <tiwai at suse.de>:
> Ah, OK, then your patch would make sense.  Could you update the patch
> description to elaborate a bit more about this?

Commit 57e5c63007955838043e34c732d224b2cbbb128f "emu10k1: allow to
 disable the SRC" force hardware use only one rate (48000 hz).
EMU 0404/1010/1616 have support two hardware sampling rates (44100 and
48000 hz). This patch add check if we have EMU 0404/1010/1616 and
choose correct sample rate to restrict.

 Signed-off-by: Mihail Zenkov <mihail.zenkov at gmail.com>

 --- linux-3.8/sound/pci/emu10k1/emupcm.c
 +++ linux-3.8-1/sound/pci/emu10k1/emupcm.c
 @@ -1127,7 +1127,7 @@
         struct snd_emu10k1_pcm *epcm;
         struct snd_emu10k1_pcm_mixer *mix;
         struct snd_pcm_runtime *runtime = substream->runtime;
 -       int i, err;
 +       int i, err, sample_rate;

         epcm = kzalloc(sizeof(*epcm), GFP_KERNEL);
         if (epcm == NULL)
 @@ -1146,7 +1146,11 @@
                 kfree(epcm);
                 return err;
         }
 -       err = snd_pcm_hw_rule_noresample(runtime, 48000);
 +       if (emu->card_capabilities->emu_model &&
emu->emu1010.internal_clock == 0)
 +               sample_rate = 44100;
 +       else
 +               sample_rate = 48000;
 +       err = snd_pcm_hw_rule_noresample(runtime, sample_rate);
         if (err < 0) {
                 kfree(epcm);
                 return err;