From mboxrd@z Thu Jan 1 00:00:00 1970 From: Takashi Iwai Subject: Re: [RFC PATCH 0/2] hdmi audio dynamically bind PCM to pin Date: Wed, 18 Nov 2015 12:23:31 +0100 Message-ID: References: <1447836419-34336-1-git-send-email-libin.yang@linux.intel.com> Mime-Version: 1.0 (generated by SEMI 1.14.6 - "Maruoka") Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: Received: from mx2.suse.de (mx2.suse.de [195.135.220.15]) by alsa0.perex.cz (Postfix) with ESMTP id CAE5B2606E5 for ; Wed, 18 Nov 2015 12:23:32 +0100 (CET) In-Reply-To: <1447836419-34336-1-git-send-email-libin.yang@linux.intel.com> 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: libin.yang@linux.intel.com Cc: libin.yang@intel.com, alsa-devel@alsa-project.org, mengdong.lin@linux.intel.com List-Id: alsa-devel@alsa-project.org On Wed, 18 Nov 2015 09:46:57 +0100, libin.yang@linux.intel.com wrote: > > From: Libin Yang > > The patches are trying to support dynamically binding PCM to pin in HDMI audio. > > The first patch: > When PCM is open when there is no pin (port) bound to the PCM, > the driver try to open the PCM successfully. It will try to find > an available converter to assign to the PCM. > In PCM prepare, if there is no pin bound to the PCM, the driver > will do the simple configuration and return true. > In PCM close, if there is no pin bound to the PCM, the driver will > simply close it. > All the pin configuration will be setup in the hotplug which is done > in patch 2. > As the PCM is dynamically bound to the pin, the pcm_lock is necessary > for the whole pcm open/prepare/close process. Such a detailed explanation should be put into the patch itself, not in the cover letter. The current description is way too sparse. Takashi > The second patch: > The patch mainly handle the hotplug event. > Each time monitor is connected, a proper PCM will be bound to the pin. > If the PCM is in use, the pin must be configured. > Each time monitor is disconnect, the PCM will be unbound from the pin. > The pin will be reset. > Libin Yang (2): > ALSA: hda - hdmi playback without monitor in dynamic pcm bind mode > ALSA: hda - hdmi dynamically bind PCM to pin when monitor hotplug > > sound/pci/hda/hda_codec.h | 1 + > sound/pci/hda/patch_hdmi.c | 354 ++++++++++++++++++++++++++++++++++++++++++--- > 2 files changed, 337 insertions(+), 18 deletions(-) > > -- > 1.9.1 >