diff mbox series

[v4,8/8] drm/mediatek: Config orientation property if panel provides it

Message ID 20220606152431.1889185-9-hsinyi@chromium.org (mailing list archive)
State New, archived
Headers show
Series Add a panel API to return panel orientation | expand

Commit Message

Hsin-Yi Wang June 6, 2022, 3:24 p.m. UTC 
Panel orientation property should be set before drm_dev_register().
Mediatek drm driver calls drm_dev_register() in .bind(). However, most
panels sets orientation property relatively late, mostly in .get_modes()
callback, since this is when they are able to get the connector and
binds the orientation property to it, though the value should be known
when the panel is probed.

Let the drm driver check if the remote end point is a panel and if it
contains the orientation property. If it does, set it before
drm_dev_register() is called.

Signed-off-by: Hsin-Yi Wang <hsinyi@chromium.org>
Reviewed-by: Hans de Goede <hdegoede@redhat.com>
Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
---
 drivers/gpu/drm/mediatek/mtk_dsi.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

Comments

Stephen Boyd June 6, 2022, 7:16 p.m. UTC | #1 
Quoting Hsin-Yi Wang (2022-06-06 08:24:31)
> diff --git a/drivers/gpu/drm/mediatek/mtk_dsi.c b/drivers/gpu/drm/mediatek/mtk_dsi.c
> index d9f10a33e6fa..c56282412bfa 100644
> --- a/drivers/gpu/drm/mediatek/mtk_dsi.c
> +++ b/drivers/gpu/drm/mediatek/mtk_dsi.c
> @@ -822,6 +823,12 @@ static int mtk_dsi_encoder_init(struct drm_device *drm, struct mtk_dsi *dsi)
>                 ret = PTR_ERR(dsi->connector);
>                 goto err_cleanup_encoder;
>         }
> +
> +       /* Read panel orientation */
> +       if (dsi->panel)
> +               drm_connector_set_panel_orientation(dsi->connector,
> +                               drm_panel_get_orientation(dsi->panel));
> +

It could be simplified like so?

	drm_connector_set_orientation_from_panel(dsi->connector, dsi->panel);

Then the API could get the orientation if the panel pointer is valid.
Does any code need to use/modify the orientation value besides
drm_connector_set_panel_orientation()?

>         drm_connector_attach_encoder(dsi->connector, &dsi->encoder);
>
>         return 0;
Sam Ravnborg June 6, 2022, 7:31 p.m. UTC | #2 
Hi Hsin-Yi,

On Mon, Jun 06, 2022 at 11:24:31PM +0800, Hsin-Yi Wang wrote:
> Panel orientation property should be set before drm_dev_register().
> Mediatek drm driver calls drm_dev_register() in .bind(). However, most
> panels sets orientation property relatively late, mostly in .get_modes()
> callback, since this is when they are able to get the connector and
> binds the orientation property to it, though the value should be known
> when the panel is probed.
> 
> Let the drm driver check if the remote end point is a panel and if it
> contains the orientation property. If it does, set it before
> drm_dev_register() is called.

I do not know the best way to do what you need to do here.
But it seems wrong to introduce a deprecated function
(drm_of_find_panel_or_bridge), to set the rotation property early.

I think you need to find a way to do this utilising the panel_bridge or
something.

	Sam

> 
> Signed-off-by: Hsin-Yi Wang <hsinyi@chromium.org>
> Reviewed-by: Hans de Goede <hdegoede@redhat.com>
> Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
> ---
>  drivers/gpu/drm/mediatek/mtk_dsi.c | 10 ++++++++++
>  1 file changed, 10 insertions(+)
> 
> diff --git a/drivers/gpu/drm/mediatek/mtk_dsi.c b/drivers/gpu/drm/mediatek/mtk_dsi.c
> index d9f10a33e6fa..c56282412bfa 100644
> --- a/drivers/gpu/drm/mediatek/mtk_dsi.c
> +++ b/drivers/gpu/drm/mediatek/mtk_dsi.c
> @@ -185,6 +185,7 @@ struct mtk_dsi {
>  	struct drm_encoder encoder;
>  	struct drm_bridge bridge;
>  	struct drm_bridge *next_bridge;
> +	struct drm_panel *panel;
>  	struct drm_connector *connector;
>  	struct phy *phy;
>  
> @@ -822,6 +823,12 @@ static int mtk_dsi_encoder_init(struct drm_device *drm, struct mtk_dsi *dsi)
>  		ret = PTR_ERR(dsi->connector);
>  		goto err_cleanup_encoder;
>  	}
> +
> +	/* Read panel orientation */
> +	if (dsi->panel)
> +		drm_connector_set_panel_orientation(dsi->connector,
> +				drm_panel_get_orientation(dsi->panel));
> +
>  	drm_connector_attach_encoder(dsi->connector, &dsi->encoder);
>  
>  	return 0;
> @@ -837,6 +844,9 @@ static int mtk_dsi_bind(struct device *dev, struct device *master, void *data)
>  	struct drm_device *drm = data;
>  	struct mtk_dsi *dsi = dev_get_drvdata(dev);
>  
> +	/* Get panel if existed */
> +	drm_of_find_panel_or_bridge(dev->of_node, 0, 0, &dsi->panel, NULL);
> +
>  	ret = mtk_dsi_encoder_init(drm, dsi);
>  	if (ret)
>  		return ret;
> -- 
> 2.36.1.255.ge46751e96f-goog
Hsin-Yi Wang June 7, 2022, 3:46 a.m. UTC | #3 
On Tue, Jun 7, 2022 at 3:16 AM Stephen Boyd <swboyd@chromium.org> wrote:
>
> Quoting Hsin-Yi Wang (2022-06-06 08:24:31)
> > diff --git a/drivers/gpu/drm/mediatek/mtk_dsi.c b/drivers/gpu/drm/mediatek/mtk_dsi.c
> > index d9f10a33e6fa..c56282412bfa 100644
> > --- a/drivers/gpu/drm/mediatek/mtk_dsi.c
> > +++ b/drivers/gpu/drm/mediatek/mtk_dsi.c
> > @@ -822,6 +823,12 @@ static int mtk_dsi_encoder_init(struct drm_device *drm, struct mtk_dsi *dsi)
> >                 ret = PTR_ERR(dsi->connector);
> >                 goto err_cleanup_encoder;
> >         }
> > +
> > +       /* Read panel orientation */
> > +       if (dsi->panel)
> > +               drm_connector_set_panel_orientation(dsi->connector,
> > +                               drm_panel_get_orientation(dsi->panel));
> > +
>
> It could be simplified like so?
>
>         drm_connector_set_orientation_from_panel(dsi->connector, dsi->panel);
>
> Then the API could get the orientation if the panel pointer is valid.
> Does any code need to use/modify the orientation value besides
> drm_connector_set_panel_orientation()?
>

We can add another function to call
drm_connector_set_orientation_from_panel(), which will be like

void drm_connector_set_orientation_from_panel(connector, panel)
{
     if (panel)
          drm_connector_set_panel_orientation(connector,drm_panel_get_orientation(panel));
}

Though it's very should but I can add this if this can make the caller
more convenient.

> >         drm_connector_attach_encoder(dsi->connector, &dsi->encoder);
> >
> >         return 0;
Hsin-Yi Wang June 7, 2022, 3:53 a.m. UTC | #4 
On Tue, Jun 7, 2022 at 3:31 AM Sam Ravnborg <sam@ravnborg.org> wrote:
>
> Hi Hsin-Yi,
>
> On Mon, Jun 06, 2022 at 11:24:31PM +0800, Hsin-Yi Wang wrote:
> > Panel orientation property should be set before drm_dev_register().
> > Mediatek drm driver calls drm_dev_register() in .bind(). However, most
> > panels sets orientation property relatively late, mostly in .get_modes()
> > callback, since this is when they are able to get the connector and
> > binds the orientation property to it, though the value should be known
> > when the panel is probed.
> >
> > Let the drm driver check if the remote end point is a panel and if it
> > contains the orientation property. If it does, set it before
> > drm_dev_register() is called.
>
> I do not know the best way to do what you need to do here.
> But it seems wrong to introduce a deprecated function
> (drm_of_find_panel_or_bridge), to set the rotation property early.
>
How about of_drm_find_panel()?

> I think you need to find a way to do this utilising the panel_bridge or
> something.
>
>         Sam
>
> >
> > Signed-off-by: Hsin-Yi Wang <hsinyi@chromium.org>
> > Reviewed-by: Hans de Goede <hdegoede@redhat.com>
> > Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
> > ---
> >  drivers/gpu/drm/mediatek/mtk_dsi.c | 10 ++++++++++
> >  1 file changed, 10 insertions(+)
> >
> > diff --git a/drivers/gpu/drm/mediatek/mtk_dsi.c b/drivers/gpu/drm/mediatek/mtk_dsi.c
> > index d9f10a33e6fa..c56282412bfa 100644
> > --- a/drivers/gpu/drm/mediatek/mtk_dsi.c
> > +++ b/drivers/gpu/drm/mediatek/mtk_dsi.c
> > @@ -185,6 +185,7 @@ struct mtk_dsi {
> >       struct drm_encoder encoder;
> >       struct drm_bridge bridge;
> >       struct drm_bridge *next_bridge;
> > +     struct drm_panel *panel;
> >       struct drm_connector *connector;
> >       struct phy *phy;
> >
> > @@ -822,6 +823,12 @@ static int mtk_dsi_encoder_init(struct drm_device *drm, struct mtk_dsi *dsi)
> >               ret = PTR_ERR(dsi->connector);
> >               goto err_cleanup_encoder;
> >       }
> > +
> > +     /* Read panel orientation */
> > +     if (dsi->panel)
> > +             drm_connector_set_panel_orientation(dsi->connector,
> > +                             drm_panel_get_orientation(dsi->panel));
> > +
> >       drm_connector_attach_encoder(dsi->connector, &dsi->encoder);
> >
> >       return 0;
> > @@ -837,6 +844,9 @@ static int mtk_dsi_bind(struct device *dev, struct device *master, void *data)
> >       struct drm_device *drm = data;
> >       struct mtk_dsi *dsi = dev_get_drvdata(dev);
> >
> > +     /* Get panel if existed */
> > +     drm_of_find_panel_or_bridge(dev->of_node, 0, 0, &dsi->panel, NULL);
> > +
> >       ret = mtk_dsi_encoder_init(drm, dsi);
> >       if (ret)
> >               return ret;
> > --
> > 2.36.1.255.ge46751e96f-goog
diff mbox series

Patch

diff --git a/drivers/gpu/drm/mediatek/mtk_dsi.c b/drivers/gpu/drm/mediatek/mtk_dsi.c
index d9f10a33e6fa..c56282412bfa 100644
--- a/drivers/gpu/drm/mediatek/mtk_dsi.c
+++ b/drivers/gpu/drm/mediatek/mtk_dsi.c
@@ -185,6 +185,7 @@  struct mtk_dsi {
 	struct drm_encoder encoder;
 	struct drm_bridge bridge;
 	struct drm_bridge *next_bridge;
+	struct drm_panel *panel;
 	struct drm_connector *connector;
 	struct phy *phy;
 
@@ -822,6 +823,12 @@  static int mtk_dsi_encoder_init(struct drm_device *drm, struct mtk_dsi *dsi)
 		ret = PTR_ERR(dsi->connector);
 		goto err_cleanup_encoder;
 	}
+
+	/* Read panel orientation */
+	if (dsi->panel)
+		drm_connector_set_panel_orientation(dsi->connector,
+				drm_panel_get_orientation(dsi->panel));
+
 	drm_connector_attach_encoder(dsi->connector, &dsi->encoder);
 
 	return 0;
@@ -837,6 +844,9 @@  static int mtk_dsi_bind(struct device *dev, struct device *master, void *data)
 	struct drm_device *drm = data;
 	struct mtk_dsi *dsi = dev_get_drvdata(dev);
 
+	/* Get panel if existed */
+	drm_of_find_panel_or_bridge(dev->of_node, 0, 0, &dsi->panel, NULL);
+
 	ret = mtk_dsi_encoder_init(drm, dsi);
 	if (ret)
 		return ret;