[Sound-open-firmware] Status of ssp driver in Qemu
Hi Liam,
I wonder what is the status of the SSP driver in Qemu. Particularly, I'm interested about ssp->tx.fd / ssp->rx.fd.
It looks like these files are only opened and closed but never written to / read from.
Can you explain what is your idea on emulating the DAIs on Qemu?
thanks, Daniel.
On Wed, 2019-12-18 at 21:24 +0000, Daniel Baluta wrote:
Hi Liam,
I wonder what is the status of the SSP driver in Qemu. Particularly, I'm interested about ssp->tx.fd / ssp->rx.fd.
It looks like these files are only opened and closed but never written to / read from.
Can you explain what is your idea on emulating the DAIs on Qemu?
The intention is to be able to perform file IO for SSP IO. i.e. SSP playback would write to a file and SSP capture would read from a file. This worked in a early version prior to upstreaming, but it was a hack that needed cleaning up (still TODO).
Using file IO for DAI emulation means we can script and more easily validate input/output data from any processing.
Liam
thanks, Daniel.
On Fri, Dec 20, 2019 at 11:31 AM Liam Girdwood liam.r.girdwood@linux.intel.com wrote:
On Wed, 2019-12-18 at 21:24 +0000, Daniel Baluta wrote:
Hi Liam,
I wonder what is the status of the SSP driver in Qemu. Particularly, I'm interested about ssp->tx.fd / ssp->rx.fd.
It looks like these files are only opened and closed but never written to / read from.
Can you explain what is your idea on emulating the DAIs on Qemu?
The intention is to be able to perform file IO for SSP IO. i.e. SSP playback would write to a file and SSP capture would read from a file. This worked in a early version prior to upstreaming, but it was a hack that needed cleaning up (still TODO).
Using file IO for DAI emulation means we can script and more easily validate input/output data from any processing.
Thanks! Do you still have the patches? The upstream version doesn't do and read/write now and I was confused about what's the purpose of just opening the files :).
On Fri, 2019-12-20 at 11:34 +0200, Daniel Baluta wrote:
On Fri, Dec 20, 2019 at 11:31 AM Liam Girdwood liam.r.girdwood@linux.intel.com wrote:
On Wed, 2019-12-18 at 21:24 +0000, Daniel Baluta wrote:
Hi Liam,
I wonder what is the status of the SSP driver in Qemu. Particularly, I'm interested about ssp->tx.fd / ssp->rx.fd.
It looks like these files are only opened and closed but never written to / read from.
Can you explain what is your idea on emulating the DAIs on Qemu?
The intention is to be able to perform file IO for SSP IO. i.e. SSP playback would write to a file and SSP capture would read from a file. This worked in a early version prior to upstreaming, but it was a hack that needed cleaning up (still TODO).
Using file IO for DAI emulation means we can script and more easily validate input/output data from any processing.
Thanks! Do you still have the patches? The upstream version doesn't do and read/write now and I was confused about what's the purpose of just opening the files :).
Sadly they were on my dead NUC.
IIRC, it was mostly just file IO. Fwiw, we started moving some of the file IO to DMA virt driver (i.e. write evey playback block to file as this meant we did not need to virtualise the DAIs, just the DMA) and we could also see the data before and after the pipeline.
Liam
participants (3)
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Daniel Baluta -
Daniel Baluta -
Liam Girdwood