Hi Mr. Dae, 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. regards, Rahul Sharma. On Tue, Jun 18, 2013 at 12:03 PM, Inki Dae <inki.dae@xxxxxxxxxxx> wrote: > Hi all, > > I'd like to discuss Exynos DRM TODO work. > > There are features we have to solve and implement. The purpose of this email > is to share what we have to do so that other guys can be involved without > duplicated work. > > 1. gscaler based on KMS interfaces - exynos5250 and later use the gscaler > device instead of VP device. And now exynos drm driver has gscaler module as > a sub module of IPP framework. However, this gscaler module is very specific > to IPP framework so it's not easy to reuse this module. So maybe we need so > many works for it. > > Video play back path using post process (AS IS): > MFC--------IPP--------KMS---------FIMD or HDMI > > Ideal video play back path using post process (TO BE): > MFC--------KMS--------FIMD or HDMI > > The above scenario is to send decoded image data (YUV format) to display > device via post process. However, we don't really need to use IPP framework > in case of using gscaler as VP. All we have to do is to call kms interface > (setplane) for it like we did before. > > 2. More features for HDMI sound support - we need to implement Exynos ALSA > SoC DAI driver for HDMI audio (CPU DAI and CODEC DAI). Sampling freq, bit > rate, and so on from user side should be sent to drm hdmi driver via ALSA > interface and the ALSA SoC DAI driver. As of now, it seems like that we > should implement this driver like OMAP does because there is no common > framework for interfacing between ALSA SoC DAI driver and DRM HDMI driver: > in case of OMAP, it seems like that ALSA SoC audio driver calls interfaces > of DSS driver directly. I think we could implement ALSA SoC DAI driver in > more generic way if we first implement common framework for it. > > Welcome to any volunteer and other opinions. > > Thanks, > Inki Dae > > -- > To unsubscribe from this list: send the line "unsubscribe linux-samsung-soc" in > the body of a message to majordomo@xxxxxxxxxxxxxxx > More majordomo info at http://vger.kernel.org/majordomo-info.html _______________________________________________ dri-devel mailing list dri-devel@xxxxxxxxxxxxxxxxxxxxx http://lists.freedesktop.org/mailman/listinfo/dri-devel
