On Mon, 21 Dec 2015 09:54:23 +0100, Libin Yang wrote: > > > On 12/21/2015 04:35 PM, Takashi Iwai wrote: > > On Mon, 21 Dec 2015 01:51:02 +0100, > > Libin Yang wrote: > >> > >> Hi Takashi, > >> > >> On 12/18/2015 08:05 PM, Takashi Iwai wrote: > >>> On Fri, 18 Dec 2015 11:48:49 +0100, > >>> Takashi Iwai wrote: > >>>> > >>>> On Fri, 18 Dec 2015 03:53:32 +0100, > >>>> Yang, Libin wrote: > >>>>> > >>>>> Hi Takashi, > >>>>> > >>>>>> -----Original Message----- > >>>>>> From: Takashi Iwai [mailto:tiwai@xxxxxxx] > >>>>>> Sent: Wednesday, December 16, 2015 3:47 PM > >>>>>> To: libin.yang@xxxxxxxxxxxxxxx > >>>>>> Cc: alsa-devel@xxxxxxxxxxxxxxxx; Lin, Mengdong; Yang, Libin > >>>>>> Subject: Re: [PATCH v4 0/5] ALSA: hda - hdmi support > >>>>>> dynamic pcm assignment > >>>>>> > >>>>>> On Wed, 16 Dec 2015 06:42:40 +0100, > >>>>>> libin.yang@xxxxxxxxxxxxxxx wrote: > >>>>>>> > >>>>>>> From: Libin Yang <libin.yang@xxxxxxxxxxxxxxx> > >>>>>>> > >>>>>>> The patches are trying to support dynamically binding PCM to pin > >>>>>>> in HDMI/DP audio. > >>>>>>> > >>>>>>> The pin will not bind to any PCM if there is not monitor connected. > >>>>>>> When there is a monitor connected to the port (pin), driver will > >>>>>>> try to find a proper PCM to assign to the port and setup the pin > >>>>>>> if necessary. > >>>>>>> > >>>>>>> Libin Yang (5): > >>>>>>> ALSA: hda - hdmi begin to support dynamic PCM assignment > >>>>>>> ALSA: hda - hdmi playback without monitor in dynamic pcm bind > >>>>>> mode > >>>>>>> ALSA: hda - hdmi operate spdif based on pcm > >>>>>>> ALSA: hda - hdmi dynamically bind PCM to pin when monitor hotplug > >>>>>>> ALSA: hda - hdmi setup pin when monitor hotplug in pcm dynamic > >>>>>>> assignment mode > >>>>>> > >>>>>> I updated topic/hda-mst branch with these patches. But the patch 4 > >>>>>> needs more fixes, as suggested in another mail. > >>>>>> > >>>>>> Overall, I'd like to know whether MST audio really works in the > >>>>>> current state, or not. Do you have *any* git branch where MST audio > >>>>>> is supposed to work at all? > >>>>> > >>>>> I have uploaded the patches to: https://github.com/libinyang/linux.git > >>>>> Branch is mst_virtual_pin_github. > >>>>> > >>>>> There is still an issue when doing the mst audio playback: > >>>>> The later converter selection for pin will overwrite the previous setting. > >>>>> This is the driver bug, I'm debugging it. > >>>> > >>>> Thanks. I tried this branch, but the DP MST audio on my HP laptop > >>>> dock doesn't seem working. It gets no notification (maybe expected), > >>>> but the accesses to any HDMI devices result in the error. I tested > >>>> via aplay -Dhdmi:0,0 to 0,2. > >>>> > >>>> With the latest patchset (e.g. my test/hdmi-jack branch) I get the > >>>> notification and ELD, but the audio still doesn't come out. So, > >>>> something seems missing. > >>> > >>> Actually I'm thinking how the MST things are supposed to work here. > >>> The machine here has a docking station connected to port D, and it has > >>> to DP connectors. Meanwhile it has a built-in DP port on port C. > >>> The latter works fine while dock ports don't. > >> > >> I have updated the code last Friday, which fixed a converter setting > >> issue in MST mode. Without the latest code, there is no sound for DP > >> MST audio. > >> > >> The port D should be the same with port C for the HW connection. > > > > I tested the latest branch, commit > > d6203f02941c72e2737271d98cf382f34295307e > > bug fix > > > > 1. converter overwritten > > 2. not share the converter > > > > This is the right branch and commit for testing, right? > > Yes. this is the latest code. It works on my side. > > > > >>> Suppose if I plug two monitors on the docking station. How would the > >>> audio in HD-audio side be set up? > >> > >> Not sure how the docking station works. If the docking works as it is > >> a MST hub, there should be sound independently from both ports. But > >> I'm not sure whether the docking is a MST hub or just duplicates > >> context to the other port. > > > > It's supposed to be a MST hub. > > > >> I think we can try to get the device entry number on the pin by > >> calling snd_hda_get_num_devices(). > >> > >> The steps should be: > >> 1. connect 2 monitors to the docking station and boot up the machine. > >> 2. If xxx_get_num_devices() returns 0, this means it is not MST mode. > >> If xxx_get_num_devices() returns 1, this means it works as MST hub. > > > > Currently I have only one monitor to test, so I can't check this, > > unfortunately. > > If it is a MST hub: > 1. when there are 2 monitors are connected to the port, 2 PCM are > assigned to each monitor. snd_hda_get_num_devices() will return 1. > When playing, each PCM will find a converter to use. > 2. When there is one monitor is connected to the port, > snd_hda_get_num_devices() will return 0 and one PCM is assigned. > > Anyway, if only one monitor is connected, it should always work, no > matter with or without the DP MST support. > > Could you please tell me you HP laptop type? I will debug on it if I > can get one. I'm testing HP Folio 940 with Haswell. Takashi _______________________________________________ Alsa-devel mailing list Alsa-devel@xxxxxxxxxxxxxxxx http://mailman.alsa-project.org/mailman/listinfo/alsa-devel
