[alsa-devel] ASoC: Two codecs on a single CPU DAI
Hi,
I'm writing a driver for a custom DaVinci board, which has two codecs (Wolfson and STA323 amplifier) connected to the same CPU DAI. The intention is that both codecs always play the same audio, only the volume/mixer settings are controlled separately. In addition to that the design is atypical by the fact, that the Wolfson is the clock master. So in order to play audio on the amplifier the Wolfson must be initialized as well.
My question is: how to reflect this architecture in a SOC platform driver?
As the first approach I tried to create two DAI links, one for each codec. That worked if audio was first played on the Wolfson link (clock master was initialized) and then on the second link, using the same sampling rate.
But in fact I would need only one DAI link to both. So then I tried to make just one link to Wolfson and put the amplifier as an "aux_dev". However there I need to set hw_params and format for the amplifier codec DAI and those functions were not called. In fact there was no codec DAI created for the amplifier. I've also seen that one can define rtd_aux runtimes, but have nowhere found how to use it.
Could someone please help me?
Thanks a lot Petr
On 05/20/2014 03:08 PM, Petr Kulhavy wrote:
Hi,
I'm writing a driver for a custom DaVinci board, which has two codecs (Wolfson and STA323 amplifier) connected to the same CPU DAI. The intention is that both codecs always play the same audio, only the volume/mixer settings are controlled separately. In addition to that the design is atypical by the fact, that the Wolfson is the clock master. So in order to play audio on the amplifier the Wolfson must be initialized as well.
My question is: how to reflect this architecture in a SOC platform driver?
As the first approach I tried to create two DAI links, one for each codec. That worked if audio was first played on the Wolfson link (clock master was initialized) and then on the second link, using the same sampling rate.
But in fact I would need only one DAI link to both. So then I tried to make just one link to Wolfson and put the amplifier as an "aux_dev". However there I need to set hw_params and format for the amplifier codec DAI and those functions were not called. In fact there was no codec DAI created for the amplifier. I've also seen that one can define rtd_aux runtimes, but have nowhere found how to use it.
Could someone please help me?
Hi,
Benoit is currently working on adding support for this to the ASoC framework, see this patch series: http://comments.gmane.org/gmane.linux.alsa.devel/122160
- Lars
Hi Petr,
I'm about to release a v4, but you can used the previous version that was working fine for my setup.
I'm glad to have more users for the series, because my setup is so simple that I cannot validate all the code I'm about to change :-(
Bottom line; The more, the merrier.
Regards, Benoit
On 20/05/2014 15:46, Lars-Peter Clausen wrote:
On 05/20/2014 03:08 PM, Petr Kulhavy wrote:
Hi,
I'm writing a driver for a custom DaVinci board, which has two codecs (Wolfson and STA323 amplifier) connected to the same CPU DAI. The intention is that both codecs always play the same audio, only the volume/mixer settings are controlled separately. In addition to that the design is atypical by the fact, that the Wolfson is the clock master. So in order to play audio on the amplifier the Wolfson must be initialized as well.
My question is: how to reflect this architecture in a SOC platform driver?
As the first approach I tried to create two DAI links, one for each codec. That worked if audio was first played on the Wolfson link (clock master was initialized) and then on the second link, using the same sampling rate.
But in fact I would need only one DAI link to both. So then I tried to make just one link to Wolfson and put the amplifier as an "aux_dev". However there I need to set hw_params and format for the amplifier codec DAI and those functions were not called. In fact there was no codec DAI created for the amplifier. I've also seen that one can define rtd_aux runtimes, but have nowhere found how to use it.
Could someone please help me?
Hi,
Benoit is currently working on adding support for this to the ASoC framework, see this patch series: http://comments.gmane.org/gmane.linux.alsa.devel/122160
- Lars
Alsa-devel mailing list Alsa-devel@alsa-project.org http://mailman.alsa-project.org/mailman/listinfo/alsa-devel
Hi Benoit,
thank you, I will try them out. At the moment I need to focus on other projects, but in a few weeks I should be able to get back to the drivers.
Regards Petr
On 21.05.2014 13:29, Benoit Cousson wrote:
Hi Petr,
I'm about to release a v4, but you can used the previous version that was working fine for my setup.
I'm glad to have more users for the series, because my setup is so simple that I cannot validate all the code I'm about to change :-(
Bottom line; The more, the merrier.
Regards, Benoit
On 20/05/2014 15:46, Lars-Peter Clausen wrote:
On 05/20/2014 03:08 PM, Petr Kulhavy wrote:
Hi,
I'm writing a driver for a custom DaVinci board, which has two codecs (Wolfson and STA323 amplifier) connected to the same CPU DAI. The intention is that both codecs always play the same audio, only the volume/mixer settings are controlled separately. In addition to that the design is atypical by the fact, that the Wolfson is the clock master. So in order to play audio on the amplifier the Wolfson must be initialized as well.
My question is: how to reflect this architecture in a SOC platform driver?
As the first approach I tried to create two DAI links, one for each codec. That worked if audio was first played on the Wolfson link (clock master was initialized) and then on the second link, using the same sampling rate.
But in fact I would need only one DAI link to both. So then I tried to make just one link to Wolfson and put the amplifier as an "aux_dev". However there I need to set hw_params and format for the amplifier codec DAI and those functions were not called. In fact there was no codec DAI created for the amplifier. I've also seen that one can define rtd_aux runtimes, but have nowhere found how to use it.
Could someone please help me?
Hi,
Benoit is currently working on adding support for this to the ASoC framework, see this patch series: http://comments.gmane.org/gmane.linux.alsa.devel/122160
- Lars
Alsa-devel mailing list Alsa-devel@alsa-project.org http://mailman.alsa-project.org/mailman/listinfo/alsa-devel
participants (3)
-
Benoit Cousson -
Lars-Peter Clausen -
Petr Kulhavy