[PATCH] mediatek: Set default value for Panel Orientation connector prop.

[Chun-Kuang Hu]

Hi, Mark:

Mark Yacoub <markyacoub at chromium.org> 於 2021年12月14日 週二 下午11:13寫道：
>
> Hey CK, can we have this merged?
> Thank you!
>
> On Mon, Oct 25, 2021 at 9:13 PM Sean Paul <sean at poorly.run> wrote:
> >
> > On Fri, Oct 22, 2021 at 01:24:03PM -0400, Mark Yacoub wrote:
> > > From: Mark Yacoub <markyacoub at chromium.org>
> > >
> > > [Why]
> > > Creating the prop uses UNKNOWN as the initial value, which is not a
> > > supported value if the props is to be supported.
> > >
> > > [How]
> > > Set the panel orientation default value to NORMAL right after creating
> > > the prop.
> >
> > Reviewed-by: Sean Paul <seanpaul at chromium.org>
> >
> > >
> > > Tested on Jacuzzi(MTK)
> > > Fixes IGT at kms_properties@get_properties-sanity-{atomic,non-atomic}
> > >
> > > Signed-off-by: Mark Yacoub <markyacoub at chromium.org>
> > > ---
> > >  drivers/gpu/drm/mediatek/mtk_dsi.c | 2 ++
> > >  1 file changed, 2 insertions(+)
> > >
> > > diff --git a/drivers/gpu/drm/mediatek/mtk_dsi.c b/drivers/gpu/drm/mediatek/mtk_dsi.c
> > > index 0ad7157660afa..b7c2528a8f41c 100644
> > > --- a/drivers/gpu/drm/mediatek/mtk_dsi.c
> > > +++ b/drivers/gpu/drm/mediatek/mtk_dsi.c
> > > @@ -1039,6 +1039,8 @@ static int mtk_dsi_encoder_init(struct drm_device *drm, struct mtk_dsi *dsi)
> > >               DRM_ERROR("Unable to init panel orientation\n");
> > >               goto err_cleanup_encoder;
> > >       }
> > > +     drm_connector_set_panel_orientation(dsi->connector,
> > > +                                         DRM_MODE_PANEL_ORIENTATION_NORMAL);

In drm_connector_set_panel_orientation() [1], I find that the
orientation could be set only once. Once you set it to normal, it
could not be set to other orientation. Right?

[1] https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/drivers/gpu/drm/drm_connector.c?h=v5.16-rc5#n2302

Regards,
Chun-Kuang.

> > >
> > >       drm_connector_attach_encoder(dsi->connector, &dsi->encoder);
> > >
> > > --
> > > 2.33.0.1079.g6e70778dc9-goog
> > >
> >
> > --
> > Sean Paul, Software Engineer, Google / Chromium OS