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

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Message-ID: <krmtynkrnpdmunksxwntrnhsopbv4hu3evv5hanm2zukip7zy5@tqtyscekzqfq>
Date: Sat, 20 Dec 2025 18:40:54 +0200
From: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>
To: 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>,
        Marijn Suijten <marijn.suijten@...ainline.org>,
        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 Fri, Dec 19, 2025 at 12:39:01PM +0200, 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]
> 
> While on some of these devices, there are also all sorts of artifacts on eDP.
> 
> Reverting this fixes these issues.
> 
> Closes: https://lore.kernel.org/r/z75wnahrp7lrl5yhfdysr3np3qrs6xti2i4otkng4ex3blfgrx@xyiucge3xykb/
> Signed-off-by: Abel Vesa <abel.vesa@....qualcomm.com>

Fixes: 5978864e34b6 ("drm/msm/dpu: support plane splitting in quad-pipe case")

Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>


> ---
>  drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c  |  11 ---
>  drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.h  |   2 -
>  drivers/gpu/drm/msm/disp/dpu1/dpu_plane.c | 137 +++++++++---------------------
>  3 files changed, 40 insertions(+), 110 deletions(-)
> 

-- 
With best wishes
Dmitry