[alsa-devel] [PATCH v3 05/13] ALSA: hda: check stream decoupled register state

[Jeeja KP]

On Thu, Dec 08, 2016 at 01:41:16PM +0530, jeeja.kp at intel.com wrote:
> From: Jeeja KP <jeeja.kp at intel.com>
Hi Takashi,

I have fixed the comments on the V2 patch.
Can you please ACK this patch of this series if there no concern, as this on
on sound/hda/. I think Mark is waiting on that.. 

> 
> Check stream decoupled register value with requested value
> before decoupling/coupling the stream.
> 
> Signed-off-by: Jeeja KP <jeeja.kp at intel.com>
> ---
>  sound/hda/ext/hdac_ext_stream.c | 15 +++++++++------
>  1 file changed, 9 insertions(+), 6 deletions(-)
> 
> diff --git a/sound/hda/ext/hdac_ext_stream.c b/sound/hda/ext/hdac_ext_stream.c
> index 3be051a..c96d7a7 100644
> --- a/sound/hda/ext/hdac_ext_stream.c
> +++ b/sound/hda/ext/hdac_ext_stream.c
> @@ -128,14 +128,17 @@ void snd_hdac_ext_stream_decouple(struct hdac_ext_bus *ebus,
>  {
>  	struct hdac_stream *hstream = &stream->hstream;
>  	struct hdac_bus *bus = &ebus->bus;
> +	u32 val;
> +	int mask = AZX_PPCTL_PROCEN(hstream->index);
>  
>  	spin_lock_irq(&bus->reg_lock);
> -	if (decouple)
> -		snd_hdac_updatel(bus->ppcap, AZX_REG_PP_PPCTL, 0,
> -				AZX_PPCTL_PROCEN(hstream->index));
> -	else
> -		snd_hdac_updatel(bus->ppcap, AZX_REG_PP_PPCTL,
> -					AZX_PPCTL_PROCEN(hstream->index), 0);
> +	val = readw(bus->ppcap + AZX_REG_PP_PPCTL) & mask;
> +
> +	if (decouple && !val)
> +		snd_hdac_updatel(bus->ppcap, AZX_REG_PP_PPCTL, mask, mask);
> +	else if (!decouple && val)
> +		snd_hdac_updatel(bus->ppcap, AZX_REG_PP_PPCTL, mask, 0);
> +
>  	stream->decoupled = decouple;
>  	spin_unlock_irq(&bus->reg_lock);
>  }
> -- 
> 2.5.0
> 

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