On Tue, 13 Nov 2018 08:43:00 +0100, twischer@de.adit-jv.com wrote:
From: Laxmi Devi Laxmi.Devi@in.bosch.com
These changes are required due to the kernel commit 07b7acb51d283d8469696c906b91f1882696a4d4 ("ASoC: rsnd: update pointer more accurate")
Issue is that snd_pcm_wait() goes back to waiting because the hw_ptr is not period aligned. Therefore snd_pcm_wait() will block for a longer time as required.
With these rcar driver changes the exact position of the dma is returned. During snd_pcm_start they read hw_ptr as reference, and this hw_ptr is now not period aligned, and is a little ahead over the period while it is read. Therefore when the avail is calculated during snd_pcm_wait(), it is missing the avail_min by a few frames.
An additional option hw_ptr_alignment is provided to dmix configuration, to allow the user to configure the slave application and hw pointer alignment at startup
Signed-off-by: Laxmi Devi Laxmi.Devi@in.bosch.com Signed-off-by: Timo Wischer twischer@de.adit-jv.com
Thanks, applied now with minor fixes (mostly spaces and line breaks).
Takashi