linux-kernel - [PATCH v4 00/16] drm/msm/hdmi: rework and fix the HPD even generation

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Message-Id: <20250209-fd-hdmi-hpd-v4-0-6224568ed87f@linaro.org>
Date: Sun, 09 Feb 2025 07:04:44 +0200
From: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To: Rob Clark <robdclark@...il.com>, 
 Abhinav Kumar <quic_abhinavk@...cinc.com>, Sean Paul <sean@...rly.run>, 
 Marijn Suijten <marijn.suijten@...ainline.org>, 
 David Airlie <airlied@...il.com>, Simona Vetter <simona@...ll.ch>, 
 Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>, 
 Maxime Ripard <mripard@...nel.org>, Thomas Zimmermann <tzimmermann@...e.de>, 
 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>, 
 Simona Vetter <simona.vetter@...ll.ch>
Cc: linux-arm-msm@...r.kernel.org, dri-devel@...ts.freedesktop.org, 
 freedreno@...ts.freedesktop.org, linux-kernel@...r.kernel.org, 
 devicetree@...r.kernel.org, Jessica Zhang <quic_jesszhan@...cinc.com>, 
 Konrad Dybcio <konradybcio@...nel.org>
Subject: [PATCH v4 00/16] drm/msm/hdmi: rework and fix the HPD even
 generation

The MSM HDMI driver is plagued with the long-standing bug. If HDMI cable
is disconnected, in most of the cases cable reconnection will not be
detected properly. We have been carrying the patch from [1] in our
integration tree for ages. The time has come to fix the long-standing
bug and implement proper HPD handling.

This series was tested on msm8996 and apq8064 boards. Previously HPD
handling sometimes could trigger in the CRTC event handling, however I
can no longer reproduce it now.

[1] https://lore.kernel.org/linux-arm-msm/20171027105732.19235-2-architt@codeaurora.org/

---
Changes in v4:
- Added bindings patches. Dropped hpd-gpios from the IFC6410 board DT.
- Fixed checkpatch.pl warning about non-const string arrays.
- Rebased on top of linux-next and the MSM HDMI patchset.
- Link to v3: https://lore.kernel.org/r/20240623-fd-hdmi-hpd-v3-0-8645a64cbd63@linaro.org

Changes in v3:
- Rebase on top of linux-next
- Dropped the patches that were replaced by the HDMI Connector
  framework
- Picked up the mode_set -> atomic_pre_enable patch
- Link to v2: https://lore.kernel.org/r/20240522-fd-hdmi-hpd-v2-0-c30bdb7c5c7e@linaro.org

---
Dmitry Baryshkov (16):
      dt-bindings: display/msm/hdmi: drop obsolete GPIOs from schema
      dt-bindings: display/msm: hdmi: drop hpd-gpios
      drm/msm/hdmi: convert clock and regulator arrays to const arrays
      drm/msm/hdmi: move the alt_iface clock to the hpd list
      drm/msm/hdmi: simplify extp clock handling
      drm/msm/hdmi: drop clock frequency assignment
      drm/msm/hdmi: switch to clk_bulk API
      drm/msm/hdmi: switch to pm_runtime_resume_and_get()
      drm/msm/hdmi: add runtime PM calls to DDC transfer function
      drm/msm/hdmi: implement proper runtime PM handling
      drm/msm/hdmi: rename hpd_clks to pwr_clks
      drm/msm/hdmi: expand the HDMI_CFG macro
      drm/msm/hdmi: drop hpd-gpios support
      drm/msm/hdmi: ensure that HDMI is up if HPD is requested
      drm/msm/hdmi: wire in hpd_enable/hpd_disable bridge ops
      ARM: dts: qcom: apq8064-ifc6410: drop HDMI HPD GPIO

 .../devicetree/bindings/display/msm/hdmi.yaml      |  20 ---
 arch/arm/boot/dts/qcom/qcom-apq8064-ifc6410.dts    |   1 -
 drivers/gpu/drm/msm/hdmi/hdmi.c                    | 147 ++++++++++-----------
 drivers/gpu/drm/msm/hdmi/hdmi.h                    |  28 ++--
 drivers/gpu/drm/msm/hdmi/hdmi_bridge.c             |  55 +++-----
 drivers/gpu/drm/msm/hdmi/hdmi_hpd.c                | 141 ++++----------------
 drivers/gpu/drm/msm/hdmi/hdmi_i2c.c                |  14 +-
 drivers/gpu/drm/msm/hdmi/hdmi_phy.c                |   6 +-
 8 files changed, 141 insertions(+), 271 deletions(-)
---
base-commit: 866e43b945bf98f8e807dfa45eca92f931f3a032
change-id: 20240522-fd-hdmi-hpd-e3868deb6ae0
prerequisite-change-id: 20240307-bridge-hdmi-connector-7e3754e661d0:v7
prerequisite-patch-id: 2ab3eb29f644faba596a27259c8c4d35f824b37b
prerequisite-patch-id: 469e655ccdfd1989d58b043a6b4766d40a334ba4
prerequisite-patch-id: caf6f731bbce246ee20f92f128a1480c230aa9f3
prerequisite-patch-id: 56a9d57d44360d0913023c4d77f765c2ebf29749
prerequisite-patch-id: ac7b8e8a14af4f45170ef5df6a632adb6d8ed483
prerequisite-patch-id: 4b6ed8a13b525d2c6a3ee449ba2381041d78dacd
prerequisite-patch-id: 396e7abb756bb9c8818d44dca8fb3f819c011ee0

Best regards,
-- 
Dmitry Baryshkov <dmitry.baryshkov@...aro.org>