> -----Original Message----- > From: Takashi Iwai [mailto:tiwai@xxxxxxx] > Sent: Wednesday, November 18, 2015 7:24 PM > To: libin.yang@xxxxxxxxxxxxxxx > Cc: alsa-devel@xxxxxxxxxxxxxxxx; mengdong.lin@xxxxxxxxxxxxxxx; Yang, > Libin > Subject: Re: [RFC PATCH 0/2] hdmi audio dynamically bind > PCM to pin > > On Wed, 18 Nov 2015 09:46:57 +0100, > libin.yang@xxxxxxxxxxxxxxx wrote: > > > > From: Libin Yang <libin.yang@xxxxxxxxxxxxxxx> > > > > 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. OK. I see. Regards, Libin > > > 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 > > _______________________________________________ Alsa-devel mailing list Alsa-devel@xxxxxxxxxxxxxxxx http://mailman.alsa-project.org/mailman/listinfo/alsa-devel
