[alsa-devel] [Intel-gfx] [PATCH v2 1/4] drm/i915: Add audio set_ncts callback

[Jani Nikula]

On Mon, 10 Aug 2015, libin.yang at intel.com wrote:
> From: Libin Yang <libin.yang at intel.com>
>
> Add the set_ncts callback.
>
> With the callback, audio driver can trigger
> i915 driver to set the proper N/CTS
> based on different sample rates.
>
> Signed-off-by: Libin Yang <libin.yang at intel.com>
> ---
>  include/drm/i915_component.h | 2 ++
>  1 file changed, 2 insertions(+)
>
> diff --git a/include/drm/i915_component.h b/include/drm/i915_component.h
> index c9a8b64..7305881 100644
> --- a/include/drm/i915_component.h
> +++ b/include/drm/i915_component.h
> @@ -33,6 +33,8 @@ struct i915_audio_component {
>  		void (*put_power)(struct device *);
>  		void (*codec_wake_override)(struct device *, bool enable);
>  		int (*get_cdclk_freq)(struct device *);
> +		int (*set_ncts)(struct device *, int port, int dev_entry,
> +					int rate);

I'd rather call this set_audio_rate or similar, and dropping the
references to N and CTS. The caller does not need to know.

I'm also not fond of adding a dev_entry parameter and leaving it
unused. I do not think we know specifically how we're going to identify
MST sinks, and the interface may need to be changed anyway. Let's force
an update in the caller side as well when there's actually sensible
support in our side.

BR,
Jani.

>  	} *ops;
>  };
>  
> -- 
> 1.9.1
>
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-- 
Jani Nikula, Intel Open Source Technology Center