linux-kernel - Re: [PATCH] ASoC: fsl_sai: add IRQF

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Date:   Thu, 5 Dec 2019 11:45:30 +0200
From:   Daniel Baluta <daniel.baluta@...il.com>
To:     Michael Walle <michael@...le.cc>
Cc:     Linux-ALSA <alsa-devel@...a-project.org>,
        linuxppc-dev@...ts.ozlabs.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Timur Tabi <timur@...nel.org>,
        Nicolin Chen <nicoleotsuka@...il.com>,
        Xiubo Li <Xiubo.Lee@...il.com>,
        Fabio Estevam <festevam@...il.com>,
        Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>,
        Jaroslav Kysela <perex@...ex.cz>, Takashi Iwai <tiwai@...e.com>
Subject: Re: [PATCH] ASoC: fsl_sai: add IRQF_SHARED

On Thu, Dec 5, 2019 at 11:18 AM Michael Walle <michael@...le.cc> wrote:
>
> Hi Daniel,
>
> Am 2019-12-05 09:43, schrieb Daniel Baluta:
> > On Fri, Nov 29, 2019 at 12:40 AM Michael Walle <michael@...le.cc>
> > wrote:
> >>
> >> The LS1028A SoC uses the same interrupt line for adjacent SAIs. Use
> >> IRQF_SHARED to be able to use these SAIs simultaneously.
> >
> > Hi Michael,
> >
> > Thanks for the patch. We have a similar change inside our internal tree
> > (it is on my long TODO list to upstream :D).
> >
> > We add the shared flag conditionally on a dts property.
> >
> > Do you think it is a good idea to always add shared flag? I'm thinking
> > on SAI IP integrations where the interrupt is edge triggered.
>
> Mhh, I don't really get the point to make the flag conditionally. If
> there is only one user, the flag won't hurt, correct?
>
> If there are two users, we need the flag anyway.
>
> > AFAIK edge triggered interrupts do not get along very well
> > with sharing an interrupt line.
>
> So in that case you shouldn't use shared edge triggered interrupts in
> the
> SoC in the first place, I guess.

I think you make a good point. I was thinking that it would hurt the single
user case. But it is fine.

Thanks for the patch.

Acked-by: Daniel Baluta <daniel.baluta@....com>