linux-kernel - Re: [PATCH v10 0/2] Panel rotation patches

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Date:   Sun, 8 Mar 2020 22:25:30 +0300
From:   Dmitry Osipenko <digetx@...il.com>
To:     Derek Basehore <dbasehore@...omium.org>,
        linux-kernel@...r.kernel.org,
        Thierry Reding <thierry.reding@...il.com>
Cc:     Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Maxime Ripard <mripard@...nel.org>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        Thierry Reding <thierry.reding@...il.com>,
        Sam Ravnborg <sam@...nborg.org>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        dri-devel@...ts.freedesktop.org,
        "linux-tegra@...r.kernel.org" <linux-tegra@...r.kernel.org>
Subject: Re: [PATCH v10 0/2] Panel rotation patches

06.03.2020 03:21, Derek Basehore пишет:
> This adds the plumbing for reading panel rotation from the devicetree
> and sets up adding a panel property for the panel orientation on
> Mediatek SoCs when a rotation is present.

Hello Derek and everyone,

I'm looking at adding display rotation support to NVIDIA Tegra DRM
driver because some devices have display panel physically mounted
upside-down, and thus, display controller's scan-out needs to be rotated
by 180° in this case.

Derek, yours panel-rotation patches add support for assigning panel's
orientation to the connector, but then only primary display plane
receives rotation value in [1], while rotation needs to be applied to
all available overlay/cursor planes and this should happen in other
places than [1] as well.

[1] drm_client_modeset_commit_atomic()

Please also note that in a case of the scan-out rotation, plane's
coordinates need to be changed in accordance to the display's rotation.

I looked briefly through the DRM code and my understanding that the DRM
core currently doesn't support use-case where scan-out needs to rotated
based on a panel's orientation, correct? Is it the use-case you're
working on for the Mediatek driver?