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.
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.
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.
Best Regards,
Libin
thanks,
Takashi
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