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

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Message-ID: <BN6PR12MB1809562679A0266AF1C43A81F76D0@BN6PR12MB1809.namprd12.prod.outlook.com>
Date:   Thu, 17 Oct 2019 13:56:21 +0000
From:   "Deucher, Alexander" <Alexander.Deucher@....com>
To:     "RAVULAPATI, VISHNU VARDHAN RAO" 
        <Vishnuvardhanrao.Ravulapati@....com>,
        Mark Brown <broonie@...nel.org>
CC:     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

> -----Original Message-----
> From: RAVULAPATI, VISHNU VARDHAN RAO
> <Vishnuvardhanrao.Ravulapati@....com>
> Sent: Thursday, October 17, 2019 5:33 AM
> To: Mark Brown <broonie@...nel.org>; 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 11/10/19 3:03 AM, vishnu wrote:
> > Hi,
> > Please find my inline comments.
> >
> > Thanks,
> > Vishnu
> >
> > On 01/10/19 10:59 PM, Mark Brown wrote:
> >> 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.
> >
> > Actually our device is audio device and it does not depends on MSI`s.
> > So we thought to remove it as it has no purpose or meaning to have
> > this code in our audio based ACP-PCI driver.
> >
> >>> Doesn't the driver have to opt into MSI support?  As such, won't
> >>> removing this code effectively disable MSI support?
> >>
> >> Yes.
> >
> >
> 
> Hi Mark,
> 
> Any updates on this patch.

You are removing functionality from the driver with no rational as to why it's necessary.  What's the point of this patch?  Does it fix a particular issue?  If not, I suggest just dropping it.  The hw supports MSIs, why not use them?

Alex