diff options
| author | Russell King <rmk+kernel@arm.linux.org.uk> | 2014-06-26 14:23:20 (GMT) |
|---|---|---|
| committer | Mark Brown <broonie@linaro.org> | 2014-06-28 12:18:46 (GMT) |
| commit | 920ec4e595faf89f7db022a068a4729a4d2c48ae (patch) | |
| tree | f82ac9e0ac61eac897e602779cad88c90a41b0f9 /sound/soc/kirkwood/kirkwood-i2s.c | |
| parent | a622251c01b628cbbd1b02a877a6469303ec2b58 (diff) | |
| download | linux-920ec4e595faf89f7db022a068a4729a4d2c48ae.tar.xz | |
ASoC: kirkwood: implement NO_PERIOD_WAKEUP support
Permit ALSA to run without hardware interrupts from the audio interface.
Instead, ALSA will use a kernel timer to decide when to check the buffer
state, resulting in a lighter workload for the CPU.
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Tested-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: Mark Brown <broonie@linaro.org>
Diffstat (limited to 'sound/soc/kirkwood/kirkwood-i2s.c')
| -rw-r--r-- | sound/soc/kirkwood/kirkwood-i2s.c | 9 |
1 files changed, 6 insertions, 3 deletions
diff --git a/sound/soc/kirkwood/kirkwood-i2s.c b/sound/soc/kirkwood/kirkwood-i2s.c index e98650c..0704cd6 100644 --- a/sound/soc/kirkwood/kirkwood-i2s.c +++ b/sound/soc/kirkwood/kirkwood-i2s.c @@ -234,6 +234,7 @@ static unsigned kirkwood_i2s_play_mute(unsigned ctl) static int kirkwood_i2s_play_trigger(struct snd_pcm_substream *substream, int cmd, struct snd_soc_dai *dai) { + struct snd_pcm_runtime *runtime = substream->runtime; struct kirkwood_dma_data *priv = snd_soc_dai_get_drvdata(dai); uint32_t ctl, value; @@ -271,9 +272,11 @@ static int kirkwood_i2s_play_trigger(struct snd_pcm_substream *substream, writel(value, priv->io + KIRKWOOD_PLAYCTL); /* enable interrupts */ - value = readl(priv->io + KIRKWOOD_INT_MASK); - value |= KIRKWOOD_INT_CAUSE_PLAY_BYTES; - writel(value, priv->io + KIRKWOOD_INT_MASK); + if (!runtime->no_period_wakeup) { + value = readl(priv->io + KIRKWOOD_INT_MASK); + value |= KIRKWOOD_INT_CAUSE_PLAY_BYTES; + writel(value, priv->io + KIRKWOOD_INT_MASK); + } /* enable playback */ writel(ctl, priv->io + KIRKWOOD_PLAYCTL); |