On Thu, 22 Mar 2018 08:19:51 +0100, Hui Wang wrote: > > On 2018年03月21日 21:09, Hui Wang wrote: > > On 2018年03月21日 17:48, Takashi Iwai wrote: > >> On Wed, 21 Mar 2018 10:39:35 +0100, > >> Ughreja, Rakesh A wrote: > >>> > >>> > >>>> -----Original Message----- > >>>> From: alsa-devel-bounces@xxxxxxxxxxxxxxxx > >>>> [mailto:alsa-devel-bounces@alsa- > >>>> project.org] On Behalf Of Takashi Iwai > >>>> Sent: Wednesday, March 21, 2018 2:45 PM > >>>> To: alsa-devel@xxxxxxxxxxxxxxxx > >>>> Cc: Hui Wang <hui.wang@xxxxxxxxxxxxx> > >>>> Subject: [PATCH] ALSA: hda - Force polling mode on > >>>> CFL for fixing > >>>> codec communication > >>>> > >>>> We've observed too long probe time with Coffee Lake machines, and the > >>>> likely cause is some communication problem between the HD-audio > >>>> controller and the codec chips. While the controller expects an IRQ > >>>> wakeup for each codec response, it seems sometimes missing, and it > >>>> takes one second for the controller driver to time out and read the > >>>> response in the polling mode. > >>>> > >>> I think I faced similar problem while doing the HDA ASoC work. > >>> > >>> I don't have any way to reproduce and test this. Can we increase > >>> the delay after the link is powered ON. The present delay is 100usec, > >>> can we make it 521 uSec ? Possibly the codec is not ready after > >>> the link is powered on and so it's not responding. > >> I'm afraid that this wouldn't help since the issue appears repeatedly > >> at later points. > >> > >> But still it's worth to try. Hui, could you investigate? > > > > OK, I will test it tomorrow. > > > > Regards, > > Hui. > > > I disabled the polling_mode and changed udelay(100) to > udelay(521)/mdelay(521), the problem still can be reproduced. > > Looks like only enabling polling_mode can fix this problem. extending > delay after intel_ml_lctl_set_power(chip, 1); does not help fix this > problem. Thanks, that's what I expected. Will include the tentative fix with polling mode in the next pull request. Takashi _______________________________________________ Alsa-devel mailing list Alsa-devel@xxxxxxxxxxxxxxxx http://mailman.alsa-project.org/mailman/listinfo/alsa-devel
