exynos drm hdmi audio: how to recieve audio parameters (sf, bps, channel count)

[Rob Clark]

On Tue, Jul 17, 2012 at 1:12 AM, RAHUL SHARMA <rahul.sharma at samsung.com> wrote:
> hi,
>
> I am adding support for hdmi audio, inside exynos drm hdmi driver. Hdmi audio is initialized with default parameters. I want to implement the mechanism to update hdmi registers, whenever audio properties got changed (i2s/spdif). raedon/r600 drm dirver is polling the audio ip every 100 ms and reconfigure the hdmi audio block. This is not possible with exynos as all information cannot be collected from i2s tx registers. It is directly set on wm8994 connected through i2c.
> Possible solution:
> 1) drm driver exposing ioctl for setting audio parameters.
> 2) alsa driver notifying the change in audio parameters through kernel notifiers. drm hdmi driver subscribed for the same.

I am certainly not an audio expert, but I am pretty sure something
along the lines of solution #2 would be better.  I don't think
userspace would want to know about some exynos drm specific ioctls in
order to make audio work.

BR,
-R

> Please suggest me a good way to implement this.
>
> regards,
> Rahul Sharma.
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