[alsa-devel] [PATCH v5 03/10] ALSA: hda: read trigger_timestamp immediately after starting DMA

[Takashi Iwai]

At Fri,  6 Feb 2015 15:55:52 -0600,
Pierre-Louis Bossart wrote:
> 
> Make sure wallclock counter and trigger timestamp are read very
> close to each other for better alignment.
> 
> Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart at linux.intel.com>

Applied, thanks.


Takashi


> ---
>  sound/pci/hda/hda_controller.c | 3 +++
>  1 file changed, 3 insertions(+)
> 
> diff --git a/sound/pci/hda/hda_controller.c b/sound/pci/hda/hda_controller.c
> index 0cfc9c8..234208a 100644
> --- a/sound/pci/hda/hda_controller.c
> +++ b/sound/pci/hda/hda_controller.c
> @@ -657,6 +657,9 @@ static int azx_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
>  		azx_writel(chip, SSYNC, azx_readl(chip, SSYNC) & ~sbits);
>  	if (start) {
>  		azx_timecounter_init(substream, 0, 0);
> +		snd_pcm_gettime(substream->runtime, &substream->runtime->trigger_tstamp);
> +		substream->runtime->trigger_tstamp_latched = true;
> +
>  		if (nsync > 1) {
>  			cycle_t cycle_last;
>  
> -- 
> 1.9.1
> 
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