From mboxrd@z Thu Jan 1 00:00:00 1970 From: Libin Yang Subject: Re: [PATCH v4 0/5] ALSA: hda - hdmi support dynamic pcm assignment Date: Mon, 21 Dec 2015 08:51:02 +0800 Message-ID: <56774CF6.60005@linux.intel.com> References: <1450244565-77041-1-git-send-email-libin.yang@linux.intel.com> <96A12704CE18D347B625EE2D4A099D197B2CAF@SHSMSX103.ccr.corp.intel.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii"; Format="flowed" Content-Transfer-Encoding: 7bit Return-path: Received: from mga09.intel.com (mga09.intel.com [134.134.136.24]) by alsa0.perex.cz (Postfix) with ESMTP id 115702608B1 for ; Mon, 21 Dec 2015 01:53:40 +0100 (CET) In-Reply-To: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: alsa-devel-bounces@alsa-project.org Sender: alsa-devel-bounces@alsa-project.org To: Takashi Iwai , "Yang, Libin" Cc: "Lin, Mengdong" , "alsa-devel@alsa-project.org" List-Id: alsa-devel@alsa-project.org 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@suse.de] >>>> Sent: Wednesday, December 16, 2015 3:47 PM >>>> To: libin.yang@linux.intel.com >>>> Cc: alsa-devel@alsa-project.org; Lin, Mengdong; Yang, Libin >>>> Subject: Re: [alsa-devel] [PATCH v4 0/5] ALSA: hda - hdmi support >>>> dynamic pcm assignment >>>> >>>> On Wed, 16 Dec 2015 06:42:40 +0100, >>>> libin.yang@linux.intel.com wrote: >>>>> >>>>> From: Libin Yang >>>>> >>>>> 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 > _______________________________________________ > Alsa-devel mailing list > Alsa-devel@alsa-project.org > http://mailman.alsa-project.org/mailman/listinfo/alsa-devel >