linux-kernel - [PATCH RFC 0/6] Attempt to bring up display on Milos SoC

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Message-Id: <20251219-milos-mdss-v1-0-4537a916bdf9@fairphone.com>
Date: Fri, 19 Dec 2025 17:41:06 +0100
From: Luca Weiss <luca.weiss@...rphone.com>
To: Bjorn Andersson <andersson@...nel.org>, 
 Konrad Dybcio <konradybcio@...nel.org>, 
 Rob Clark <robin.clark@....qualcomm.com>, 
 Dmitry Baryshkov <lumag@...nel.org>, 
 Abhinav Kumar <abhinav.kumar@...ux.dev>, 
 Jessica Zhang <jessica.zhang@....qualcomm.com>, Sean Paul <sean@...rly.run>, 
 Marijn Suijten <marijn.suijten@...ainline.org>, 
 David Airlie <airlied@...il.com>, Simona Vetter <simona@...ll.ch>, 
 Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>, 
 Conor Dooley <conor+dt@...nel.org>
Cc: ~postmarketos/upstreaming@...ts.sr.ht, phone-devel@...r.kernel.org, 
 linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org, 
 dri-devel@...ts.freedesktop.org, freedreno@...ts.freedesktop.org, 
 devicetree@...r.kernel.org, Luca Weiss <luca.weiss@...rphone.com>
Subject: [PATCH RFC 0/6] Attempt to bring up display on Milos SoC

Hi all,

This is a very WIP RFC series that attempts to add display support for
Milos, in particular on The Fairphone (Gen. 6) using the SM7635.

I have excluded sending panel driver and dt-bindings to reduce the patch
count, since they should not be relevant for now.

The data in the patches is mostly derived from the downstream msm-6.1
kernel for this SoC, named "volcano" downstream.

https://gerrit-public.fairphone.software/plugins/gitiles/platform/vendor/qcom/proprietary/display-devicetree/+/refs/heads/odm/rc/target/15/fp6/display/volcano-sde-common.dtsi

While I'm fairly sure a good chunk of the data is correct (marked "OK"),
there's still many unknowns (marked "TODO" or similar) that you can
see in the patches.

Unfortunately it doesn't work yet, with the screen staying dark and
these errors appearing in dmesg repeatedly.

[    6.541696] [drm:dpu_encoder_frame_done_timeout:2727] [dpu error]enc33 frame done timeout
[    6.587091] [drm:_dpu_encoder_phys_cmd_wait_for_idle] *ERROR* id:33 pp:2 kickoff timeout 0 cnt 1 koff_cnt 1
[    6.587387] [drm:dpu_encoder_phys_cmd_prepare_for_kickoff] *ERROR* failed wait_for_idle: id:33 ret:-110 pp:2
[    6.589509] [drm:dpu_encoder_helper_hw_reset:1763] [dpu error]enc33 ctl 1 reset failure
[    6.637482] [drm:dpu_encoder_frame_done_timeout:2727] [dpu error]enc33 frame done timeout
[    6.680077] [drm:dpu_encoder_phys_cmd_wait_for_commit_done] *ERROR* failed wait_for_idle: id:33 ret:-110 intf:1
[    6.680356] [drm:dpu_kms_wait_for_commit_done:525] [dpu error]wait for commit done returned -110
[    6.684517] [drm:dpu_encoder_helper_hw_reset:1763] [dpu error]enc33 ctl 1 reset failure
[    6.729507] [drm:dpu_encoder_frame_done_timeout:2727] [dpu error]enc33 frame done timeout

The panel is the BOE BJ631JHM-T71-D900 with a Novatek NT37705 driver IC,
running in command mode (not video mode).

The vsync/TE pin should be configured correctly:

~ # cat /sys/kernel/debug/pinctrl/f100000.pinctrl/pinmux-pins | grep GPIO_129
pin 129 (GPIO_129): device ae94000.dsi.0 function mdp_vsync group gpio129

A full dmesg can be found at https://public.lucaweiss.eu/tmp/milos-mdss-log-2025-12-19.txt

Schematics of the device are also available if somebody wants to take a
look, starting on page 109:
https://www.fairphone.com/wp-content/uploads/2025/08/Fairphone-Gen.-6_-Information-on-how-to-repair-dispose-of-and-recycle-EN-NL-FR-DE.pdf

Please let me know if you have any ideas what could be wrong and how to
fix it. Thanks!

Signed-off-by: Luca Weiss <luca.weiss@...rphone.com>
---
Luca Weiss (6):
      soc: qcom: ubwc: Add config for Milos
      drm/msm/dsi: add support for DSI-PHY on Milos
      drm/msm: mdss: Add Milos support
      drm/msm/dpu: Add Milos support
      arm64: dts: qcom: milos: Add MDSS
      arm64: dts: qcom: milos-fairphone-fp6: Enable panel

 arch/arm64/boot/dts/qcom/milos-fairphone-fp6.dts   |  71 +++++-
 arch/arm64/boot/dts/qcom/milos.dtsi                | 211 ++++++++++++++-
 .../gpu/drm/msm/disp/dpu1/catalog/dpu_10_2_milos.h | 284 +++++++++++++++++++++
 drivers/gpu/drm/msm/disp/dpu1/dpu_hw_catalog.c     |  22 ++
 drivers/gpu/drm/msm/disp/dpu1/dpu_hw_catalog.h     |   1 +
 drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c            |   1 +
 drivers/gpu/drm/msm/dsi/phy/dsi_phy.c              |   2 +
 drivers/gpu/drm/msm/dsi/phy/dsi_phy.h              |   1 +
 drivers/gpu/drm/msm/dsi/phy/dsi_phy_7nm.c          |  24 ++
 drivers/gpu/drm/msm/msm_mdss.c                     |   5 +
 drivers/soc/qcom/ubwc_config.c                     |  12 +
 11 files changed, 627 insertions(+), 7 deletions(-)
---
base-commit: 167013d059d5c4a09d49068408044c7a65a26cee
change-id: 20251219-milos-mdss-fa0763693775

Best regards,
-- 
Luca Weiss <luca.weiss@...rphone.com>