linux-kernel - [PATCH v8 0/7] Support DRM bridges on NVIDIA Tegra

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Message-Id: <20200617222703.17080-1-digetx@gmail.com>
Date:   Thu, 18 Jun 2020 01:26:56 +0300
From:   Dmitry Osipenko <digetx@...il.com>
To:     Thierry Reding <thierry.reding@...il.com>,
        Sam Ravnborg <sam@...nborg.org>,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        Rob Herring <robh+dt@...nel.org>,
        Frank Rowand <frowand.list@...il.com>
Cc:     dri-devel@...ts.freedesktop.org, linux-tegra@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH v8 0/7] Support DRM bridges on NVIDIA Tegra

Hello,

This series adds initial support for the DRM bridges to NVIDIA Tegra DRM
driver. This is required by newer device-trees where we model the LVDS
encoder bridge properly.

Changelog:

v8: - The new of_graph_get_local_port() helper is replaced with the
      of_graph_presents(), which simply checks the graph presence in a
      given DT node. Thank to Laurent Pinchart for the suggestion!

    - The of_graph_get_local_port() is still there, but now it isn't a public
      function anymore. In the review to v7 Laurent Pinchart suggested that
      the function's doc-comments and name could be improved and I implemented
      these suggestions in v8.

    - A day ago I discovered that devm_drm_panel_bridge_add() requires
      panel to have connector type to be properly set, otherwise function
      rejects panels with the incomplete description. So, I checked what
      LVDS panels are used on Tegra and fixed the missing connector types
      in this new patch:

        drm/panel-simple: Add missing connector type for some panels

v7: - Removed the obscure unused structs (which GCC doesn't detect, but CLANG
      does) in the patch "Wrap directly-connected panel into DRM bridge",
      which was reported by kernel test robot for v6.

v6: - Added r-b and acks from Rob Herring and Sam Ravnborg.

    - Rebased on a recent linux-next, patches now apply without fuzz.

v5: - Added new patches that make drm_of_find_panel_or_bridge() more usable
      if graph isn't defined in a device-tree:

        of_graph: add of_graph_get_local_port()
        drm/of: Make drm_of_find_panel_or_bridge() to check graph's presence

    - Updated "Support DRM bridges" patch to use drm_of_find_panel_or_bridge()
      directly and added WARN_ON(output->panel || output->bridge) sanity-check.

    - Added new "Wrap directly-connected panel into DRM bridge" patch, as
      was suggested by Laurent Pinchart.

v4: - Following review comments that were made by Laurent Pinchart to the v3,
      we now create and use the "bridge connector".

v3: - Following recommendation from Sam Ravnborg, the new bridge attachment
      model is now being used, i.e. we ask bridge to *not* create a connector
      using the DRM_BRIDGE_ATTACH_NO_CONNECTOR flag.

    - The bridge is now created only for the RGB (LVDS) output, and only
      when necessary. For now we don't need bridges for HDMI or DSI outputs.

    - I noticed that we're leaking OF node in the panel's error code path,
      this is fixed now by the new patch "Don't leak OF node on error".

v2: - Added the new "rgb: Don't register connector if bridge is used"
      patch, which hides the unused connector provided by the Tegra DRM
      driver when bridge is used, since bridge provides its own connector
      to us.

Dmitry Osipenko (7):
  of_graph: add of_graph_presents()
  drm/of: Make drm_of_find_panel_or_bridge() to check graph's presence
  drm/tegra: output: Don't leak OF node on error
  drm/tegra: output: Support DRM bridges
  drm/tegra: output: rgb: Support LVDS encoder bridge
  drm/tegra: output: rgb: Wrap directly-connected panel into DRM bridge
  drm/panel-simple: Add missing connector type for some panels

 drivers/gpu/drm/drm_of.c             |   9 +++
 drivers/gpu/drm/panel/panel-simple.c |   7 ++
 drivers/gpu/drm/tegra/drm.h          |   2 +
 drivers/gpu/drm/tegra/output.c       |  21 ++++--
 drivers/gpu/drm/tegra/rgb.c          | 102 ++++++++++++++-------------
 drivers/of/property.c                |  52 +++++++++++---
 include/linux/of_graph.h             |   6 ++
 7 files changed, 137 insertions(+), 62 deletions(-)

-- 
2.26.0