From: "Luca Weiss" <luca.weiss@fairphone.com>
To: "Dmitry Baryshkov" <dmitry.baryshkov@oss.qualcomm.com>,
"Luca Weiss" <luca.weiss@fairphone.com>
Cc: "Mahadevan P" <mahadevan.p@oss.qualcomm.com>,
"Rob Clark" <robin.clark@oss.qualcomm.com>,
"Dmitry Baryshkov" <lumag@kernel.org>,
"Abhinav Kumar" <abhinav.kumar@linux.dev>,
"Jessica Zhang" <jesszhan0024@gmail.com>,
"Sean Paul" <sean@poorly.run>,
"Marijn Suijten" <marijn.suijten@somainline.org>,
"David Airlie" <airlied@gmail.com>,
"Simona Vetter" <simona@ffwll.ch>,
"Krishna Manikandan" <quic_mkrishn@quicinc.com>,
<linux-arm-msm@vger.kernel.org>,
<dri-devel@lists.freedesktop.org>,
<freedreno@lists.freedesktop.org>, <linux-kernel@vger.kernel.org>,
<regressions@lists.linux.dev>
Subject: Re: [PATCH v2] drm/msm/disp/dpu: add merge3d support for sc7280
Date: Mon, 16 Mar 2026 10:08:47 +0100 [thread overview]
Message-ID: <DH437ESQRIAF.2336WF7XZBTI@fairphone.com> (raw)
In-Reply-To: <tbi5mwg4jt5scvr76lpzpvi5zj3kn3entoorsd4dior4g23czd@xtobadslhfrz>
Hi Dmitry,
On Fri Mar 13, 2026 at 6:14 PM CET, Dmitry Baryshkov wrote:
> On Fri, Mar 13, 2026 at 09:33:18AM +0100, Luca Weiss wrote:
>> Hi Mahadevan,
>>
>> On Thu Jan 1, 2026 at 6:04 AM CET, Mahadevan P wrote:
>> > On SC7280 targets, display modes with a width greater than the
>> > max_mixer_width (2400) are rejected during mode validation when
>> > merge3d is disabled. This limitation exists because, without a
>> > 3D merge block, two layer mixers cannot be combined(non-DSC interface),
>> > preventing large layers from being split across mixers. As a result,
>> > higher resolution modes cannot be supported.
>> >
>> > Enable merge3d support on SC7280 to allow combining streams from
>> > two layer mixers into a single non-DSC interface. This capability
>> > removes the width restriction and enables buffer sizes beyond the
>> > 2400-pixel limit.
>> >
>> > Fixes: 591e34a091d1 ("drm/msm/disp/dpu1: add support for display for SC7280 target")
>> > Signed-off-by: Mahadevan P <mahadevan.p@oss.qualcomm.com>
>>
>> This patch is causing display regression on QCM6490 fairphone-fp5.
>>
>> With this patch in 7.0-rc3 (or 6.18.16) there's just pink noise on the
>> screen. When reverting this patch everything becomes working again.
>>
>> See also https://salsa.debian.org/Mobian-team/devices/kernels/qcom-linux/-/issues/41
>>
>> @Dmitry: Can we revert this for later 7.0-rc, in case it's not fixed
>> quickly?
>
> Could you please provide the resource allocation parts of
> debugfs/dri/0/state for both working and non-working cases?
Working (patch reverted)
# cat /sys/kernel/debug/dri/1/state
plane[44]: plane-0
crtc=crtc-0
fb=71
allocated by = phoc
refcount=2
format=XR24 little-endian (0x34325258)
modifier=0x500000000000001
size=1224x2700
layers:
size[0]=1224x2700
pitch[0]=5120
offset[0]=0
obj[0]:
name=0
refcount=6
start=00103729
size=14680064
imported=no
crtc-pos=1224x2700+0+0
src-pos=1224.000000x2700.000000+0.000000+0.000000
rotation=1
normalized-zpos=0
color-encoding=ITU-R BT.601 YCbCr
color-range=YCbCr limited range
color_mgmt_changed=0
color-pipeline=0
stage=1
sspp[0]=sspp_0
multirect_mode[0]=none
multirect_index[0]=solo
src[0]=1224x2700+0+0
dst[0]=1224x2700+0+0
plane[50]: plane-1
crtc=(null)
fb=0
crtc-pos=0x0+0+0
src-pos=0.000000x0.000000+0.000000+0.000000
rotation=1
normalized-zpos=0
color-encoding=ITU-R BT.601 YCbCr
color-range=YCbCr limited range
color_mgmt_changed=0
color-pipeline=0
stage=0
sspp[0]=sspp_8
multirect_mode[0]=none
multirect_index[0]=solo
src[0]=0x0+0+0
dst[0]=0x0+0+0
plane[56]: plane-2
crtc=(null)
fb=0
crtc-pos=0x0+0+0
src-pos=0.000000x0.000000+0.000000+0.000000
rotation=1
normalized-zpos=0
color-encoding=ITU-R BT.601 YCbCr
color-range=YCbCr limited range
color_mgmt_changed=0
color-pipeline=0
stage=0
sspp[0]=sspp_9
multirect_mode[0]=none
multirect_index[0]=solo
src[0]=0x0+0+0
dst[0]=0x0+0+0
plane[62]: plane-3
crtc=(null)
fb=0
crtc-pos=0x0+0+0
src-pos=0.000000x0.000000+0.000000+0.000000
rotation=1
normalized-zpos=0
color-encoding=ITU-R BT.601 YCbCr
color-range=YCbCr limited range
color_mgmt_changed=0
color-pipeline=0
stage=0
sspp[0]=sspp_10
multirect_mode[0]=none
multirect_index[0]=solo
src[0]=0x0+0+0
dst[0]=0x0+0+0
crtc[68]: crtc-0
enable=1
active=1
self_refresh_active=0
planes_changed=1
mode_changed=0
active_changed=0
connectors_changed=0
color_mgmt_changed=0
plane_mask=1
connector_mask=1
encoder_mask=1
mode: "1224x2700": 90 311156 1224 1256 1264 1272 2700 2708 2710 2718 0x48 0x0
lm[0]=2
ctl[0]=0
crtc[69]: crtc-1
enable=0
active=0
self_refresh_active=0
planes_changed=0
mode_changed=0
active_changed=0
connectors_changed=0
color_mgmt_changed=0
plane_mask=0
connector_mask=0
encoder_mask=0
mode: "": 0 0 0 0 0 0 0 0 0 0 0x0 0x0
connector[34]: DSI-1
crtc=crtc-0
self_refresh_aware=0
interlace_allowed=0
ycbcr_420_allowed=0
max_requested_bpc=0
colorspace=Default
connector[36]: DP-1
crtc=(null)
self_refresh_aware=0
interlace_allowed=0
ycbcr_420_allowed=1
max_requested_bpc=0
colorspace=Default
connector[39]: Writeback-1
crtc=(null)
self_refresh_aware=0
interlace_allowed=0
ycbcr_420_allowed=0
max_requested_bpc=0
colorspace=Default
resource mapping:
pingpong=# # 68 # - - - - - - - - -
mixer=# - 68 # - - - -
ctl=68 # # # - - - -
dspp=# - - - - - - -
dsc=68 - - - - - - -
cdm=#
sspp=# - - - - - - - # # # - - - - -
cwb=- - - -
Broken (with the patch)
# cat /sys/kernel/debug/dri/1/state
plane[44]: plane-0
crtc=crtc-0
fb=72
allocated by = phoc
refcount=2
format=XR24 little-endian (0x34325258)
modifier=0x500000000000001
size=1224x2700
layers:
size[0]=1224x2700
pitch[0]=5120
offset[0]=0
obj[0]:
name=0
refcount=6
start=00103729
size=14680064
imported=no
crtc-pos=1224x2700+0+0
src-pos=1224.000000x2700.000000+0.000000+0.000000
rotation=1
normalized-zpos=0
color-encoding=ITU-R BT.601 YCbCr
color-range=YCbCr limited range
color_mgmt_changed=0
color-pipeline=0
stage=1
sspp[0]=sspp_0
multirect_mode[0]=none
multirect_index[0]=solo
src[0]=1224x2700+0+0
dst[0]=1224x2700+0+0
plane[50]: plane-1
crtc=(null)
fb=0
crtc-pos=0x0+0+0
src-pos=0.000000x0.000000+0.000000+0.000000
rotation=1
normalized-zpos=0
color-encoding=ITU-R BT.601 YCbCr
color-range=YCbCr limited range
color_mgmt_changed=0
color-pipeline=0
stage=0
sspp[0]=sspp_8
multirect_mode[0]=none
multirect_index[0]=solo
src[0]=0x0+0+0
dst[0]=0x0+0+0
plane[56]: plane-2
crtc=(null)
fb=0
crtc-pos=0x0+0+0
src-pos=0.000000x0.000000+0.000000+0.000000
rotation=1
normalized-zpos=0
color-encoding=ITU-R BT.601 YCbCr
color-range=YCbCr limited range
color_mgmt_changed=0
color-pipeline=0
stage=0
sspp[0]=sspp_9
multirect_mode[0]=none
multirect_index[0]=solo
src[0]=0x0+0+0
dst[0]=0x0+0+0
plane[62]: plane-3
crtc=(null)
fb=0
crtc-pos=0x0+0+0
src-pos=0.000000x0.000000+0.000000+0.000000
rotation=1
normalized-zpos=0
color-encoding=ITU-R BT.601 YCbCr
color-range=YCbCr limited range
color_mgmt_changed=0
color-pipeline=0
stage=0
sspp[0]=sspp_10
multirect_mode[0]=none
multirect_index[0]=solo
src[0]=0x0+0+0
dst[0]=0x0+0+0
crtc[68]: crtc-0
enable=1
active=1
self_refresh_active=0
planes_changed=1
mode_changed=0
active_changed=0
connectors_changed=0
color_mgmt_changed=0
plane_mask=1
connector_mask=1
encoder_mask=1
mode: "1224x2700": 90 311156 1224 1256 1264 1272 2700 2708 2710 2718 0x48 0x0
lm[0]=2
ctl[0]=0
lm[1]=3
ctl[1]=0
crtc[69]: crtc-1
enable=0
active=0
self_refresh_active=0
planes_changed=0
mode_changed=0
active_changed=0
connectors_changed=0
color_mgmt_changed=0
plane_mask=0
connector_mask=0
encoder_mask=0
mode: "": 0 0 0 0 0 0 0 0 0 0 0x0 0x0
connector[34]: DSI-1
crtc=crtc-0
self_refresh_aware=0
interlace_allowed=0
ycbcr_420_allowed=0
max_requested_bpc=0
colorspace=Default
connector[36]: DP-1
crtc=(null)
self_refresh_aware=0
interlace_allowed=0
ycbcr_420_allowed=1
max_requested_bpc=0
colorspace=Default
connector[39]: Writeback-1
crtc=(null)
self_refresh_aware=0
interlace_allowed=0
ycbcr_420_allowed=0
max_requested_bpc=0
colorspace=Default
resource mapping:
pingpong=# # 68 68 - - - - - - - - -
mixer=# - 68 68 - - - -
ctl=68 # # # - - - -
dspp=# - - - - - - -
dsc=68 - - - - - - -
cdm=#
sspp=# - - - - - - - # # # - - - - -
cwb=- - - -
next prev parent reply other threads:[~2026-03-16 9:08 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-01-01 5:04 [PATCH v2] drm/msm/disp/dpu: add merge3d support for sc7280 Mahadevan P
2026-01-02 23:53 ` Dmitry Baryshkov
2026-01-15 21:05 ` Dmitry Baryshkov
2026-03-13 8:33 ` Luca Weiss
2026-03-13 17:14 ` Dmitry Baryshkov
2026-03-16 9:08 ` Luca Weiss [this message]
2026-03-16 19:54 ` Dmitry Baryshkov
2026-03-17 7:47 ` Luca Weiss
2026-03-17 17:45 ` Dmitry Baryshkov
2026-03-18 8:45 ` Luca Weiss
2026-03-18 17:17 ` Dmitry Baryshkov
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