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

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Date:   Tue, 1 Oct 2019 17:23:43 +0000
From:   "Deucher, Alexander" <Alexander.Deucher@....com>
To:     "RAVULAPATI, VISHNU VARDHAN RAO" 
        <Vishnuvardhanrao.Ravulapati@....com>
CC:     "RAVULAPATI, VISHNU VARDHAN RAO" 
        <Vishnuvardhanrao.Ravulapati@....com>,
        Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>,
        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: Monday, September 30, 2019 8:58 PM
> Cc: Deucher, Alexander <Alexander.Deucher@....com>; RAVULAPATI,
> VISHNU VARDHAN RAO <Vishnuvardhanrao.Ravulapati@....com>; Liam
> Girdwood <lgirdwood@...il.com>; Mark Brown <broonie@...nel.org>;
> Jaroslav Kysela <perex@...ex.cz>; Takashi Iwai <tiwai@...e.com>;
> Mukunda, Vijendar <Vijendar.Mukunda@....com>; Maruthi Srinivas
> Bayyavarapu <Maruthi.Bayyavarapu@....com>; Deucher, Alexander
> <Alexander.Deucher@....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: [PATCH 1/7] ASoC: amd: No need PCI-MSI interrupts
> 
> 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?  Doesn't the driver have to opt into MSI support?  As such, won't removing this code effectively disable MSI support?

Alex

> 
> Signed-off-by: Ravulapati Vishnu vardhan rao
> <Vishnuvardhanrao.Ravulapati@....com>
> ---
>  sound/soc/amd/raven/pci-acp3x.c | 11 +----------
>  1 file changed, 1 insertion(+), 10 deletions(-)
> 
> diff --git a/sound/soc/amd/raven/pci-acp3x.c b/sound/soc/amd/raven/pci-
> acp3x.c index facec24..8f6bf00 100644
> --- a/sound/soc/amd/raven/pci-acp3x.c
> +++ b/sound/soc/amd/raven/pci-acp3x.c
> @@ -46,14 +46,7 @@ static int snd_acp3x_probe(struct pci_dev *pci,
>  		goto release_regions;
>  	}
> 
> -	/* check for msi interrupt support */
> -	ret = pci_enable_msi(pci);
> -	if (ret)
> -		/* msi is not enabled */
> -		irqflags = IRQF_SHARED;
> -	else
> -		/* msi is enabled */
> -		irqflags = 0;
> +	irqflags = 0;
> 
>  	addr = pci_resource_start(pci, 0);
>  	adata->acp3x_base = ioremap(addr, pci_resource_len(pci, 0)); @@ -
> 112,7 +105,6 @@ static int snd_acp3x_probe(struct pci_dev *pci,
>  	return 0;
> 
>  unmap_mmio:
> -	pci_disable_msi(pci);
>  	iounmap(adata->acp3x_base);
>  release_regions:
>  	pci_release_regions(pci);
> @@ -129,7 +121,6 @@ static void snd_acp3x_remove(struct pci_dev *pci)
>  	platform_device_unregister(adata->pdev);
>  	iounmap(adata->acp3x_base);
> 
> -	pci_disable_msi(pci);
>  	pci_release_regions(pci);
>  	pci_disable_device(pci);
>  }
> --
> 2.7.4