* Alsa triggering methods
@ 2015-04-29 15:24 Andy Ng
2015-05-06 11:05 ` Vinod Koul
2015-05-07 13:38 ` Clemens Ladisch
0 siblings, 2 replies; 3+ messages in thread
From: Andy Ng @ 2015-04-29 15:24 UTC (permalink / raw)
To: alsa-devel
Hi,
I am working on a ALSA card driver that handles a DSP instance. The
problem I have is that the triggering mechanism in ALSA to start a PCM
has the interrupts disabled, and my dsp framework is actually
acknowledging the start trigger with an event after 50 microseconds
time that I can't handle because the IRQs are disabled.
Is there any way when the trigger mechanism goes down to the card to
be able to handle any acknowledgements what will happen within a sort
period of time.
I have seen bespoke triggering method but not sure if everyone is using it.
Any ideas would be helpful.
Best regards,
Andreas
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: Alsa triggering methods
2015-04-29 15:24 Alsa triggering methods Andy Ng
@ 2015-05-06 11:05 ` Vinod Koul
2015-05-07 13:38 ` Clemens Ladisch
1 sibling, 0 replies; 3+ messages in thread
From: Vinod Koul @ 2015-05-06 11:05 UTC (permalink / raw)
To: Andy Ng; +Cc: alsa-devel
On Wed, Apr 29, 2015 at 04:24:09PM +0100, Andy Ng wrote:
> Hi,
>
> I am working on a ALSA card driver that handles a DSP instance. The
> problem I have is that the triggering mechanism in ALSA to start a PCM
> has the interrupts disabled, and my dsp framework is actually
> acknowledging the start trigger with an event after 50 microseconds
> time that I can't handle because the IRQs are disabled.
>
> Is there any way when the trigger mechanism goes down to the card to
> be able to handle any acknowledgements what will happen within a sort
> period of time.
>
> I have seen bespoke triggering method but not sure if everyone is using it.
>
> Any ideas would be helpful.
trigger can be nonatomic too, you can set nonatomic = true for your pcms
--
~Vinod
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: Alsa triggering methods
2015-04-29 15:24 Alsa triggering methods Andy Ng
2015-05-06 11:05 ` Vinod Koul
@ 2015-05-07 13:38 ` Clemens Ladisch
1 sibling, 0 replies; 3+ messages in thread
From: Clemens Ladisch @ 2015-05-07 13:38 UTC (permalink / raw)
To: Andy Ng, alsa-devel
Andy Ng wrote:
> I am working on a ALSA card driver that handles a DSP instance. The
> problem I have is that the triggering mechanism in ALSA to start a PCM
> has the interrupts disabled, and my dsp framework is actually
> acknowledging the start trigger with an event after 50 microseconds
> time that I can't handle because the IRQs are disabled.
Why must you handle the ACK interrupt from inside the trigger?
Regards,
Clemens
^ permalink raw reply [flat|nested] 3+ messages in thread
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2015-04-29 15:24 Alsa triggering methods Andy Ng
2015-05-06 11:05 ` Vinod Koul
2015-05-07 13:38 ` Clemens Ladisch
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