linux-kernel - [PATCH v3 0/3] 180 degrees rotation support for NVIDIA Tegra DRM

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Message-Id: <20200617234040.1094-1-digetx@gmail.com>
Date:   Thu, 18 Jun 2020 02:40:37 +0300
From:   Dmitry Osipenko <digetx@...il.com>
To:     Thierry Reding <thierry.reding@...il.com>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        Derek Basehore <dbasehore@...omium.org>,
        Sam Ravnborg <sam@...nborg.org>,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        Sean Paul <sean@...rly.run>, Daniel Vetter <daniel@...ll.ch>,
        Ville Syrjälä 
        <ville.syrjala@...ux.intel.com>,
        Emil Velikov <emil.l.velikov@...il.com>,
        Daniel Stone <daniel@...ishbar.org>
Cc:     dri-devel@...ts.freedesktop.org, linux-tegra@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH v3 0/3] 180 degrees rotation support for NVIDIA Tegra DRM

Hello!

This series adds 180° display plane rotation support to the NVIDIA Tegra
DRM driver which is needed for devices that have display panel physically
mounted upside-down, like Nexus 7 tablet device for example [1]. Since
DRM panel rotation is a new thing for a userspace, currently only
Opentegra Xorg driver [2] and a recent Weston [3] have support for the
rotated display panels, but this is more than good enough for the starter.

[1] https://patchwork.ozlabs.org/project/linux-tegra/patch/20200607154327.18589-3-digetx@gmail.com/
[2] https://github.com/grate-driver/xf86-video-opentegra/commit/28eb20a3959bbe5bc3a3b67e55977093fd5114ca
[3] https://gitlab.freedesktop.org/wayland/weston/-/merge_requests/315

Changelog:

v3: - Factored out the panel patches into standalone series [4] because
      this series doesn't have hard dependency on the panel patches and it
      should be nicer to review and apply the properly grouped patches.

    - The DRM_MODE_ROTATE_180 now isn't passed to drm_rotation_simplify(),
      like it was suggested by Ville Syrjälä in the comment to v2.

    - Added clarifying comment for the tegra_fb_is_bottom_up() in the code.

[4] https://lore.kernel.org/lkml/20200617231842.30671-1-digetx@gmail.com/T/#t

Dmitry Osipenko (3):
  drm/tegra: plane: Rename bottom_up to reflect_y
  drm/tegra: plane: Support horizontal reflection
  drm/tegra: plane: Support 180° rotation

 drivers/gpu/drm/tegra/dc.c    | 46 ++++++++++++++++++++++++++++-------
 drivers/gpu/drm/tegra/dc.h    |  3 ++-
 drivers/gpu/drm/tegra/plane.c |  3 ++-
 drivers/gpu/drm/tegra/plane.h |  3 ++-
 4 files changed, 43 insertions(+), 12 deletions(-)

-- 
2.26.0