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

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Message-ID: <qo7aqnnsguk6u3xuyrm56aw7r3sacmzjxb4tuquveurihzuhpi@3nrengxofekn>
Date: Sat, 20 Dec 2025 19:05:35 +0200
From: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>
To: Luca Weiss <luca.weiss@...rphone.com>
Cc: 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>,
        ~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
Subject: Re: [PATCH RFC 0/6] Attempt to bring up display on Milos SoC

On Fri, Dec 19, 2025 at 05:41:06PM +0100, Luca Weiss wrote:
> 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

I guess, that it doesn't fulfill your needs, but I'd start with checking
that WB works (you can read the image back via modetest command and
verify it manually with imagemagick). Then if your platform has DP
support, it might be easier to get it enabled.

For the DSI CMD, I'd suggest checking the clocks and then getting IRQ
traces on the downstream kernel.

> 
> 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>
> 

-- 
With best wishes
Dmitry