[GSOC 2016] HD Audio Emulation For Bhyve Status

[Alex Teaca]

Hi,

I added a pin widget (Line-out) and now the Audio Output Widget is enabled.
The codec is installed as pcm0:
root at vm_hda:~ # cat /dev/sndstat
Installed devices:
pcm0: <Generic (0x8086) (Analog Line-out)> (play) default

The next step is to implement the stream management operations such as
start_stream and stop_stream. I have taken a look on the Stream management
chapter from the HDA specification in order to get familiar with these
operations and study the driver implementation (hdaa_audio_setup,
hdac_stream_start, hdac_stream_stop) to see what registers are programmed
and what commands are sent to the codec.

Together with Peter and Alexander we chose the design of the interaction
between the HDA controller, codecs and Audio player regarding the stream
management.

Thanks,
Alex


On Mon, Jun 6, 2016 at 10:01 PM, Alex Teaca <ionutalex.teaca at gmail.com>
wrote:

> Hi,
>
> Here is the status with the features I have implemented so far.
>
>  - set up the HDA controller as a PCI device in bhyve
>  - design the layout of registers and implement the read and write access
> to the registers
>  - implement the CORB and RIRB mechanisms in order to get commands from
> driver and respond back
>  - add the hdac_codec module and implement the interface of communication
> between the hda controller and codec
>  - describe the hda codec parameters for each node (ROOT, FG and AUDIO
> OUTPUT)
>  - handle the GET_PARAMETER verb
>
> At the moment there is only one widget: the Autio Output Widget and the
> hda driver has disabled it because it does not find any Pin widget.
>
> The plan is to add the Pin output widget and to continue with the streams
> data in order to play some samples.
>
> Thanks,
> Alex
>
>