On Sun, Dec 03, 2017 at 09:15:21PM -0600, Pierre-Louis Bossart wrote: > On 12/3/17 11:20 AM, Vinod Koul wrote: > >On Fri, Dec 01, 2017 at 09:03:25PM +0100, Takashi Iwai wrote: > >>>>>FIXME: > >>>>>- KConfig changes does not look right, but I could not think of any proper > >>>>> way without making changes into legacy HDA codec driver. So need some > >>>>> help on this topic. > >>>> > >>>>And this is another big issue. As long as you don't allow build both, > >>>>it never flies with distros, and it means no dramatic improvement of > >>>>the situation, either. > >>>> > >>>>IOW, we have to make the codec driver working on both controller/bus > >>>>implementations, and it essentially means to rewrite the HD-audio > >>>>codec plumbing code. Currently, it's a kind of half-baked state, and > >>>>we need to cast to unified form. > >>> > >>>Before going into codec support, should we first deal with the > >>>selection of the ASoC/Legacy mode for the controller side of things? > >>>Even with basic HDMI/iDisp cases, we don't have a clean solution > >>>today. When I worked on the late Joule platform, there was no fallback > >>>mode which forced a recompilation depending on BIOS settings. > >>>My understanding is that there is no support for multiple drivers > >>>registering for the same PCI ID, I believe we'll have to define a > >>>top-level wrapper which arbitrates internally based on BIOS settings > >>>and user/distro preferences which mode is selected. > >> > >>True, we need to sort out that. But the selection of the card-level > >>driver can be relatively easily done in a manual way, either via > >>blacklisting or by common module options. Currently AMDGPU and radeon > >>drivers are in such situation, for example. > >> > >>A common single switch, or at best the automatic arbitration would be > >>preferred, of course, though. > > > >The switch is again short term as we should progress and move towards one > >solution whilst deprecating the other, so that way this makes a simple > >solution and helps in transition, change flag defaults and deprecate. > > Sorry, I don't get your point. Are you saying the legacy would be > deprecated? that was never my understanding, Rakesh's patches only make it > easier to use the DSP in combination with an HDaudio codec, but if the DSP > is not present the legacy is the fallback, no? for now yes, but what prevents us from supporting coupled mode when DSP is disabled :) -- ~Vinod _______________________________________________ Alsa-devel mailing list Alsa-devel@xxxxxxxxxxxxxxxx http://mailman.alsa-project.org/mailman/listinfo/alsa-devel
