On Wed, 18 Nov 2015 09:46:57 +0100, libin.yang@linux.intel.com wrote:
From: Libin Yang libin.yang@linux.intel.com
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