linux-kernel - Re: [PATCH v2 5/5] drm/tegra: plane: Support 180° rotation

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Message-ID: <CACvgo50P5i2jX6ZrMD=UuGr_bA=8MbFhYBWBNvkMcdCyJKS5xg@mail.gmail.com>
Date:   Mon, 15 Jun 2020 22:47:37 +0100
From:   Emil Velikov <emil.l.velikov@...il.com>
To:     Dmitry Osipenko <digetx@...il.com>
Cc:     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>, linux-tegra@...r.kernel.org,
        "Linux-Kernel@...r. Kernel. Org" <linux-kernel@...r.kernel.org>,
        ML dri-devel <dri-devel@...ts.freedesktop.org>
Subject: Re: [PATCH v2 5/5] drm/tegra: plane: Support 180° rotation

Hi all,

Perhaps a silly question:

On Mon, 15 Jun 2020 at 08:28, Dmitry Osipenko <digetx@...il.com> wrote:
>
> Combining horizontal and vertical reflections gives us 180 degrees of
> rotation.
>
> Signed-off-by: Dmitry Osipenko <digetx@...il.com>
> ---
>  drivers/gpu/drm/tegra/dc.c | 13 ++++++++++++-
>  1 file changed, 12 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/tegra/dc.c b/drivers/gpu/drm/tegra/dc.c
> index f31bca27cde4..ddd9b88f8fce 100644
> --- a/drivers/gpu/drm/tegra/dc.c
> +++ b/drivers/gpu/drm/tegra/dc.c

> +       if (rotation & DRM_MODE_ROTATE_180) {
> +               plane_state->reflect_x = !plane_state->reflect_x;
> +               plane_state->reflect_y = !plane_state->reflect_y;
> +       }
> +
As mentioned by Ville the above is already handled by
drm_rotation_simplify() ... although it makes me wonder:


>         err = drm_plane_create_rotation_property(&plane->base,
>                                                  DRM_MODE_ROTATE_0,
>                                                  DRM_MODE_ROTATE_0 |
> +                                                DRM_MODE_ROTATE_180 |
>                                                  DRM_MODE_REFLECT_X |
>                                                  DRM_MODE_REFLECT_Y);

Would it make sense for drm_plane_create_rotation_property() itself,
to add DRM_MODE_ROTATE_180, when both reflections are supported?

-Emil