linux-kernel - Re: [PATCH] ASoC: amd:Replacing MSI with Legacy IRQ model

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Date:   Sun, 27 Dec 2020 19:03:28 +0100
From:   Jaroslav Kysela <perex@...ex.cz>
To:     Ravulapati Vishnu vardhan rao 
        <Vishnuvardhanrao.Ravulapati@....com>
Cc:     Alexander.Deucher@....com, Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>, Takashi Iwai <tiwai@...e.com>,
        Akshu Agrawal <akshu.agrawal@....com>,
        Dan Carpenter <dan.carpenter@...cle.com>,
        Vijendar Mukunda <Vijendar.Mukunda@....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] ASoC: amd:Replacing MSI with Legacy IRQ model

Dne 22. 12. 20 v 12:59 Ravulapati Vishnu vardhan rao napsal(a):
> When we try to play and capture simultaneously we see that
> interrupts are genrated but our handler is not being acknowledged,
> After investigating further more in detail on this issue we found
> that IRQ delivery via MSI from the ACP IP is unreliable and so sometimes
> interrupt generated will not be acknowledged so MSI model shouldn't be used
> and using legacy IRQs will resolve interrupt handling issue.

What is the real culprit? It's hw bug? If not, it would be better to fix the
PCI code or the irq handler.

					Jaroslav

-- 
Jaroslav Kysela <perex@...ex.cz>
Linux Sound Maintainer; ALSA Project; Red Hat, Inc.