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ALSA: rme96: Fix unexpected volume reset after rate changes 

rme96 driver needs to reset DAC depending on the sample rate, and this
results in resetting to the max volume suddenly.  It's because of the
missing call of snd_rme96_apply_dac_volume().

However, calling this function right after the DAC reset still may not
work, and we need some delay before this call.  Since the DAC reset
and the procedure after that are performed in the spinlock, we delay
the DAC volume restore at the end after the spinlock.

Reported-and-tested-by: Sylvain LABOISNE <maeda1@free.fr>
Cc: <stable@vger.kernel.org>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Takashi Iwai 2015-12-04 16:44:24 +01:00
parent bcdda2ec28
commit a74a821624
1 changed files with 26 additions and 15 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

41
sound/pci/rme96.c
View File

@ -741,10 +741,11 @@ snd_rme96_playback_setrate(struct rme96 *rme96,
{
/* change to/from double-speed: reset the DAC (if available) */
snd_rme96_reset_dac(rme96);
return 1; /* need to restore volume */
} else {
writel(rme96->wcreg, rme96->iobase + RME96_IO_CONTROL_REGISTER);
return 0;
}
return 0;
}
static int
@ -980,6 +981,7 @@ snd_rme96_playback_hw_params(struct snd_pcm_substream *substream,
struct rme96 *rme96 = snd_pcm_substream_chip(substream);
struct snd_pcm_runtime *runtime = substream->runtime;
int err, rate, dummy;
bool apply_dac_volume = false;
runtime->dma_area = (void __force *)(rme96->iobase +
RME96_IO_PLAY_BUFFER);
@ -993,24 +995,26 @@ snd_rme96_playback_hw_params(struct snd_pcm_substream *substream,
{
/* slave clock */
if ((int)params_rate(params) != rate) {
spin_unlock_irq(&rme96->lock);
return -EIO;
}
} else if ((err = snd_rme96_playback_setrate(rme96, params_rate(params))) < 0) {
spin_unlock_irq(&rme96->lock);
return err;
}
if ((err = snd_rme96_playback_setformat(rme96, params_format(params))) < 0) {
spin_unlock_irq(&rme96->lock);
return err;
err = -EIO;
goto error;
}
} else {
err = snd_rme96_playback_setrate(rme96, params_rate(params));
if (err < 0)
goto error;
apply_dac_volume = err > 0; /* need to restore volume later? */
}
err = snd_rme96_playback_setformat(rme96, params_format(params));
if (err < 0)
goto error;
snd_rme96_setframelog(rme96, params_channels(params), 1);
if (rme96->capture_periodsize != 0) {
if (params_period_size(params) << rme96->playback_frlog !=
rme96->capture_periodsize)
{
spin_unlock_irq(&rme96->lock);
return -EBUSY;
err = -EBUSY;
goto error;
}
}
rme96->playback_periodsize =
@ -1021,9 +1025,16 @@ snd_rme96_playback_hw_params(struct snd_pcm_substream *substream,
rme96->wcreg &= ~(RME96_WCR_PRO | RME96_WCR_DOLBY | RME96_WCR_EMP);
writel(rme96->wcreg |= rme96->wcreg_spdif_stream, rme96->iobase + RME96_IO_CONTROL_REGISTER);
}
err = 0;
error:
spin_unlock_irq(&rme96->lock);
return 0;
if (apply_dac_volume) {
usleep_range(3000, 10000);
snd_rme96_apply_dac_volume(rme96);
}
return err;
}
static int