[PATCH v5 00/13] drm/msm/hdmi: rework and fix the HPD even generation

[Dmitry Baryshkov]

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 v5:
- Dropped hpd-gpio patches (to prevent ABI break, Krzysztof)
- Link to v4: https://lore.kernel.org/r/20250209-fd-hdmi-hpd-v4-0-6224568ed87f@linaro.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 (13):
      dt-bindings: display/msm/hdmi: drop obsolete GPIOs from schema
      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: ensure that HDMI is up if HPD is requested
      drm/msm/hdmi: wire in hpd_enable/hpd_disable bridge ops

 .../devicetree/bindings/display/msm/hdmi.yaml      |  15 ---
 drivers/gpu/drm/msm/hdmi/hdmi.c                    | 133 ++++++++++-----------
 drivers/gpu/drm/msm/hdmi/hdmi.h                    |  26 ++--
 drivers/gpu/drm/msm/hdmi/hdmi_bridge.c             |  55 ++++-----
 drivers/gpu/drm/msm/hdmi/hdmi_hpd.c                |  89 ++++----------
 drivers/gpu/drm/msm/hdmi/hdmi_i2c.c                |  14 ++-
 drivers/gpu/drm/msm/hdmi/hdmi_phy.c                |   6 +-
 7 files changed, 135 insertions(+), 203 deletions(-)
---
base-commit: db76003ade5953d4a83c2bdc6e15c2d1c33e7350
change-id: 20240522-fd-hdmi-hpd-e3868deb6ae0

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