linux-kernel - Re: [PATCH 1/7] ASoC: amd: No need PCI-MSI interrupts

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Message-ID: <20191001172941.GC4786@sirena.co.uk>
Date:   Tue, 1 Oct 2019 18:29:41 +0100
From:   Mark Brown <broonie@...nel.org>
To:     "Deucher, Alexander" <Alexander.Deucher@....com>
Cc:     "RAVULAPATI, VISHNU VARDHAN RAO" 
        <Vishnuvardhanrao.Ravulapati@....com>,
        Liam Girdwood <lgirdwood@...il.com>,
        Jaroslav Kysela <perex@...ex.cz>,
        Takashi Iwai <tiwai@...e.com>,
        "Mukunda, Vijendar" <Vijendar.Mukunda@....com>,
        Maruthi Srinivas Bayyavarapu <Maruthi.Bayyavarapu@....com>,
        Colin Ian King <colin.king@...onical.com>,
        Dan Carpenter <dan.carpenter@...cle.com>,
        "moderated list:SOUND - SOC LAYER / DYNAMIC AUDIO POWER MANAGEM..." 
        <alsa-devel@...a-project.org>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/7] ASoC: amd: No need PCI-MSI interrupts

On Tue, Oct 01, 2019 at 05:23:43PM +0000, Deucher, Alexander wrote:

> > ACP-PCI controller driver does not depends msi interrupts.
> > So removed msi related pci functions which have no use and does not impact
> > on existing functionality.

> In general, however, aren't MSIs preferred to legacy interrupts?

As I understand it.  Or at the very least I'm not aware of any situation
where they're harmful.  It'd be good to have a clear explanation of why
we're removing the support.

> Doesn't the driver have to opt into MSI support?  As such, won't
> removing this code effectively disable MSI support?

Yes.

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