linux-kernel - [PATCH v4 0/7] drm/msm/mdp4: rework LVDS/LCDC panel support

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Message-Id: <20250425-fd-mdp4-lvds-v4-0-6b212160b44c@oss.qualcomm.com>
Date: Fri, 25 Apr 2025 12:51:50 +0300
From: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>
To: Rob Clark <robdclark@...il.com>, Abhinav Kumar <quic_abhinavk@...cinc.com>,
        Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
        Sean Paul <sean@...rly.run>,
        Marijn Suijten <marijn.suijten@...ainline.org>,
        Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Maxime Ripard <mripard@...nel.org>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        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>,
        Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konradybcio@...nel.org>
Cc: linux-arm-msm@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        freedreno@...ts.freedesktop.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Konrad Dybcio <konrad.dybcio@....qualcomm.com>
Subject: [PATCH v4 0/7] drm/msm/mdp4: rework LVDS/LCDC panel support

The LCDC controller uses pixel clock provided by the multimedia clock
controller (mmcc) instead of using LVDS PHY clock directly. Link LVDS
clocks properly, taking MMCC into account.

MDP4 uses custom code to handle LVDS panel. It predates handling
EPROBE_DEFER, it tries to work when the panel device is not available,
etc. Switch MDP4 LCDC code to use drm_panel_bridge/drm_bridge_connector
to follow contemporary DRM practices.

Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>
---
Changes in v4:
- Retained compatibility with older DT by reusing PLL as LCDC clock
  (Abhinav)
- Link to v3: https://lore.kernel.org/r/20250227-fd-mdp4-lvds-v3-0-c983788987ae@linaro.org

Changes in v3:
- Fixed commit message to explain that DT name is used in addition to
  the global system table lookup (Konrad).
- Link to v2: https://lore.kernel.org/r/20250220-fd-mdp4-lvds-v2-0-15afe5578a31@linaro.org

Changes in v2:
- Rebase on top of msm-next.
- Upgrade LVDS clock code to use clock providers and parent_data
- Use LVDS clock from the MMCC instead of using LVDS PHY directly
- Link to v1: https://lore.kernel.org/r/20220616090321.433249-1-dmitry.baryshkov@linaro.org

---
Dmitry Baryshkov (7):
      dt-bindings: display: msm: mdp4: add LCDC clock and PLL source
      drm/msm/mdp4: drop mpd4_lvds_pll_init stub
      drm/msm/mdp4: register the LVDS PLL as a clock provider
      drm/msm/mdp4: use parent_data for LVDS PLL
      drm/msm/mdp4: move move_valid callback to lcdc_encoder
      drm/msm/mdp4: switch LVDS to use drm_bridge/_connector
      arm: dts: qcom: apq8064: link LVDS clocks

 .../devicetree/bindings/display/msm/mdp4.yaml      |   9 +-
 arch/arm/boot/dts/qcom/qcom-apq8064.dtsi           |  16 ++-
 drivers/gpu/drm/msm/Makefile                       |   1 -
 drivers/gpu/drm/msm/disp/mdp4/mdp4_kms.c           |  34 ++++--
 drivers/gpu/drm/msm/disp/mdp4/mdp4_kms.h           |  16 +--
 drivers/gpu/drm/msm/disp/mdp4/mdp4_lcdc_encoder.c  |  50 ++++-----
 .../gpu/drm/msm/disp/mdp4/mdp4_lvds_connector.c    | 121 ---------------------
 drivers/gpu/drm/msm/disp/mdp4/mdp4_lvds_pll.c      |  51 ++++++---
 8 files changed, 105 insertions(+), 193 deletions(-)
---
base-commit: 52beceed7049f2b4dc65ed0cc84b673bf804b679
change-id: 20240317-fd-mdp4-lvds-e317f86fd99c

Best regards,
-- 
Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>