exynos-drm-next todo work.

[Inki Dae]

2013년 7월 8일 월요일에 Rob Clark<robdclark at gmail.com>님이 작성:
> On Fri, Jul 5, 2013 at 2:12 PM, Mark Brown <broonie at kernel.org> wrote:
>> On Wed, Jun 19, 2013 at 01:48:15PM +0900, Inki Dae wrote:
>>
>>> > Related to HDMI sound support in Alsa, I have posted a working RFC
>>> > "exynos-hdmi to CDF complaint display driver". It registers a separate
>>> > sound card by registering hdmi audio codec dai and cpu-dai, as you
>>> > mentioned. But there is a problem with this approach that I2S being
the
>>> > single cpu dai for HDMI and Speaker sound card, only one card can
>>> > support playback at a time.
>>
>>> > I would like to work on this to provide a more refined solution.
>>
>>> Thanks. However, I think it's not good to use the CDF framework to
interface
>>> between ALSA SoC DAI driver and DRM HDMI driver. The purpose of the CDF
>>> framework is to provide common interfaces to display bus drivers to
Linux
>>> framebuffer and DRM KMS based display controller drivers as long as I
know.
>>> So my opinion is to implement ALSA Soc DAI driver-it seems like
possible to
>>> use as is-based on a new common framework that the other can also use
it.
>>
>> You guys really want to be discussing this on the ALSA list and CCing
>> the ASoC maintainers...  I do note that OMAP and SH both have HDMI
>> support in mainline, whatever they're doing seems like a good place to
>> start.
>
> I don't know about SH, but at least OMAP (and I've seen same on MSM
> non-upstream driver, and I guess it is the same elsewhere), there end
> up being some calls from audio driver to functions exported by the
> display driver.  I guess there is probably some better way to do it
> compared to how the existing drivers work.
>

Agree with you. we had looked into omap driver that audio driver calls
callbacks of dss driver. For this, it seems possible to use common
framework between audio and hdmi driver like PHY framework does.

exynos audio---+             +--exynos hdmi
omap audio ----+--common fw--+--omap dss
other audio----+             +--other hdmi

Thanks,
Inki Dae


> BR,
> -R
>
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