[alsa-devel] [PATCH v4 4/6] ASoC: fsl_ssi: Fix samples being dropped at Playback startup

[Fabio Estevam]

On Tue, May 3, 2016 at 9:13 AM, Arnaud Mouiche
<arnaud.mouiche at invoxia.com> wrote:
> If the capture is already running while playback is started, it is highly
> probable (>80% in a 8 channels scenario) that samples are lost between
> the DMA and TX fifo.
>
> The reason is that SIER.TDMAE is set before STCR.TFEN0, leaving a time
> window where the FIFO doesn't receive the samples written by the DMA.
>
> This particular case happened only if capture is already enabled as
> SCR.SSIEN is already set at the playback startup instant.
>
> Signed-off-by: Arnaud Mouiche <arnaud.mouiche at invoxia.com>

Reviewed-by: Fabio Estevam <fabio.estevam at nxp.com>