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SubjectRe: [PATCH 1/1] iommu/vt-d: Skip TE disabling on quirky gfx dedicated iommu
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Hi Limonciello,

On 7/21/20 10:44 PM, Limonciello, Mario wrote:
>> -----Original Message-----
>> From: iommu<iommu-bounces@lists.linux-foundation.org> On Behalf Of Lu
>> Baolu
>> Sent: Monday, July 20, 2020 7:17 PM
>> To: Joerg Roedel
>> Cc: Ashok Raj;linux-kernel@vger.kernel.org;stable@vger.kernel.org; Koba
>> Ko;iommu@lists.linux-foundation.org
>> Subject: [PATCH 1/1] iommu/vt-d: Skip TE disabling on quirky gfx dedicated
>> iommu
>>
>> The VT-d spec requires (10.4.4 Global Command Register, TE field) that:
>>
>> Hardware implementations supporting DMA draining must drain any in-flight
>> DMA read/write requests queued within the Root-Complex before completing
>> the translation enable command and reflecting the status of the command
>> through the TES field in the Global Status register.
>>
>> Unfortunately, some integrated graphic devices fail to do so after some
>> kind of power state transition. As the result, the system might stuck in
>> iommu_disable_translation(), waiting for the completion of TE transition.
>>
>> This provides a quirk list for those devices and skips TE disabling if
>> the qurik hits.
>>
>> Fixes:https://bugzilla.kernel.org/show_bug.cgi?id=208363
> That one is for TGL.
>
> I think you also want to add this one for ICL:
> Fixes:https://bugzilla.kernel.org/show_bug.cgi?id=206571
>

Do you mean someone have tested that this patch also fixes the problem
described in 206571?

Best regards,
baolu

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