[alsa-devel] [PATCH 1/3] ASoC: omap-mcbsp: Fix latency value calculation for pm_qos

[Jarkko Nikula]

On 11/14/18 1:06 PM, Peter Ujfalusi wrote:
> The latency number is in usec for the pm_qos. Correct the calculation to
> give us the time in usec
> 
> Signed-off-by: Peter Ujfalusi <peter.ujfalusi at ti.com>
> ---
>  sound/soc/omap/omap-mcbsp.c | 6 +++---
>  1 file changed, 3 insertions(+), 3 deletions(-)
> 
> diff --git a/sound/soc/omap/omap-mcbsp.c b/sound/soc/omap/omap-mcbsp.c
> index e0ef4774c710..a395598f1f20 100644
> --- a/sound/soc/omap/omap-mcbsp.c
> +++ b/sound/soc/omap/omap-mcbsp.c
> @@ -999,9 +999,9 @@ static int omap_mcbsp_dai_hw_params(struct snd_pcm_substream *substream,
>  			pkt_size = channels;
>  		}
>  
> -		latency = ((((buffer_size - pkt_size) / channels) * 1000)
> -				 / (params->rate_num / params->rate_den));
> -
> +		latency = (buffer_size - pkt_size) / channels;
> +		latency = latency * USEC_PER_SEC /
> +			  (params->rate_num / params->rate_den);

Did I understand correctly this doesn't fix any audio issue but allows
CPU sleep longer or reach deeper sleep?

-- 
Jarkko