linux-kernel - Re: [PATCH] iommu/amd: Override wrong IVRS IOAPIC on Raven Ridge systems

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Date:   Tue, 13 Aug 2019 11:58:48 +0800
From:   Kai-Heng Feng <kai.heng.feng@...onical.com>
To:     Joerg Roedel <joro@...tes.org>
Cc:     iommu@...ts.linux-foundation.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] iommu/amd: Override wrong IVRS IOAPIC on Raven Ridge
 systems

at 23:39, Joerg Roedel <joro@...tes.org> wrote:

> On Thu, Aug 08, 2019 at 06:17:07PM +0800, Kai-Heng Feng wrote:
>> Raven Ridge systems may have malfunction touchpad or hang at boot if
>> incorrect IVRS IOAPIC is provided by BIOS.
>>
>> Users already found correct "ivrs_ioapic=" values, let's put them inside
>> kernel to workaround buggy BIOS.
>
> Will that still work when a fixed BIOS for these laptops is released?

Do you mean that we should stop applying these quirks once a BIOS fix is  
confirmed?

We can modify the quirk to compare BIOS version, if there’s an unlikely  
BIOS update really fixes the issue.
Before that happens, I think it’s OK to let the quirks stay this way.

Kai-Heng

>
>
> 	Joerg