linux-kernel - Re: [PATCH 1/2] Revert "drm/msm/dpu: support plane splitting in quad-pipe case"

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Message-ID: <b6ecada9-c3be-4c94-bba6-be16f253f151@oss.qualcomm.com>
Date: Mon, 22 Dec 2025 10:26:34 +0100
From: Konrad Dybcio <konrad.dybcio@....qualcomm.com>
To: Marijn Suijten <marijn.suijten@...ainline.org>,
        Abel Vesa <abel.vesa@....qualcomm.com>
Cc: Rob Clark <robin.clark@....qualcomm.com>,
        Dmitry Baryshkov <lumag@...nel.org>,
        Abhinav Kumar
 <abhinav.kumar@...ux.dev>,
        Jessica Zhang <jesszhan0024@...il.com>, Sean Paul <sean@...rly.run>,
        David Airlie <airlied@...il.com>, Simona Vetter <simona@...ll.ch>,
        Jun Nie <jun.nie@...aro.org>, linux-arm-msm@...r.kernel.org,
        dri-devel@...ts.freedesktop.org, freedreno@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] Revert "drm/msm/dpu: support plane splitting in
 quad-pipe case"

On 12/19/25 8:55 PM, Marijn Suijten wrote:
> On 2025-12-19 12:39:01, Abel Vesa wrote:
>> This reverts commit 5978864e34b66bdae4d7613834c03dd5d0a0c891.
>>
>> At least on Hamoa based devices, there are IOMMU faults:
>>
>> arm-smmu 15000000.iommu: Unhandled context fault: fsr=0x402, iova=0x00000000, fsynr=0x3d0023, cbfrsynra=0x1c00, cb=13
>> arm-smmu 15000000.iommu: FSR    = 00000402 [Format=2 TF], SID=0x1c00
>> arm-smmu 15000000.iommu: FSYNR0 = 003d0023 [S1CBNDX=61 PNU PLVL=3]
> 
> I thought that this was normal, and that I was always seeing these on startup
> (something to do with framebuffer), but indeed by reverting this patch these
> are gone on at least the Xperia XZ2 (regular CMD-mode panel) and XZ3 (CMD-mode
> panel, 2:2:1 DSC-merge topology), both sdm845-based phones.

This is very close to what you've seen, but note this one comes with
iova = 0, meaning we're likely passing some garbage somewhere

Konrad