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Date: Wed, 28 Apr 2021 12:15:59 -0400
From: Sean Paul <sean@...rly.run>
To: Hsin-Yi Wang <hsinyi@...omium.org>
Cc: dri-devel <dri-devel@...ts.freedesktop.org>,
Chun-Kuang Hu <chunkuang.hu@...nel.org>,
Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
Maxime Ripard <mripard@...nel.org>,
Thomas Zimmermann <tzimmermann@...e.de>,
David Airlie <airlied@...ux.ie>,
Daniel Vetter <daniel@...ll.ch>,
LKML <linux-kernel@...r.kernel.org>,
Rob Herring <robh+dt@...nel.org>,
Matthias Brugger <matthias.bgg@...il.com>,
devicetree <devicetree@...r.kernel.org>,
linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
"moderated list:ARM/Mediatek SoC support"
<linux-mediatek@...ts.infradead.org>
Subject: Re: [PATCH v4 1/3] gpu: drm: separate panel orientation property
creating and value setting
On Wed, Apr 28, 2021 at 12:55 AM Hsin-Yi Wang <hsinyi@...omium.org> wrote:
>
Thank you for revising the patchset, this looks much better to me!
/snip
>
> diff --git a/drivers/gpu/drm/drm_connector.c b/drivers/gpu/drm/drm_connector.c
> index 7631f76e7f34..cda83314d7ad 100644
> --- a/drivers/gpu/drm/drm_connector.c
> +++ b/drivers/gpu/drm/drm_connector.c
/snip
> @@ -2173,8 +2173,8 @@ EXPORT_SYMBOL(drm_connector_set_vrr_capable_property);
> * @connector: connector for which to set the panel-orientation property.
> * @panel_orientation: drm_panel_orientation value to set
> *
> - * This function sets the connector's panel_orientation and attaches
> - * a "panel orientation" property to the connector.
> + * This function sets the connector's panel_orientation value. If the property
> + * doesn't exist, it will create one first.
I still don't think this function should overload initialization and
assignment. I'd prefer we just removed the creation from
set_panel_orientation entirely so this WARN can't be hit.
> *
> * Calling this function on a connector where the panel_orientation has
> * already been set is a no-op (e.g. the orientation has been overridden with
> @@ -2206,18 +2206,16 @@ int drm_connector_set_panel_orientation(
>
> prop = dev->mode_config.panel_orientation_property;
> if (!prop) {
> - prop = drm_property_create_enum(dev, DRM_MODE_PROP_IMMUTABLE,
> - "panel orientation",
> - drm_panel_orientation_enum_list,
> - ARRAY_SIZE(drm_panel_orientation_enum_list));
> - if (!prop)
> - return -ENOMEM;
> + int ret;
>
> - dev->mode_config.panel_orientation_property = prop;
> + ret = drm_connector_init_panel_orientation_property(connector);
> + if (ret)
> + return ret;
> + prop = dev->mode_config.panel_orientation_property;
> }
>
> - drm_object_attach_property(&connector->base, prop,
> - info->panel_orientation);
> + drm_object_property_set_value(&connector->base, prop,
> + info->panel_orientation);
> return 0;
> }
> EXPORT_SYMBOL(drm_connector_set_panel_orientation);
> @@ -2225,7 +2223,7 @@ EXPORT_SYMBOL(drm_connector_set_panel_orientation);
> /**
> * drm_connector_set_panel_orientation_with_quirk -
> * set the connector's panel_orientation after checking for quirks
> - * @connector: connector for which to init the panel-orientation property.
> + * @connector: connector for which to set the panel-orientation property.
> * @panel_orientation: drm_panel_orientation value to set
> * @width: width in pixels of the panel, used for panel quirk detection
> * @height: height in pixels of the panel, used for panel quirk detection
> @@ -2252,6 +2250,40 @@ int drm_connector_set_panel_orientation_with_quirk(
> }
> EXPORT_SYMBOL(drm_connector_set_panel_orientation_with_quirk);
>
> +/**
> + * drm_connector_init_panel_orientation_property -
> + * create the connector's panel orientation property
> + *
> + * This function attaches a "panel orientation" property to the connector
> + * and initializes its value to DRM_MODE_PANEL_ORIENTATION_UNKNOWN.
> + *
> + * The value of the property can be set by drm_connector_set_panel_orientation()
> + * or drm_connector_set_panel_orientation_with_quirk() later.
> + *
> + * Returns:
> + * Zero on success, negative errno on failure.
> + */
> +int drm_connector_init_panel_orientation_property(
> + struct drm_connector *connector)
> +{
> + struct drm_device *dev = connector->dev;
> + struct drm_property *prop;
> +
> + prop = drm_property_create_enum(dev, DRM_MODE_PROP_IMMUTABLE,
> + "panel orientation",
> + drm_panel_orientation_enum_list,
> + ARRAY_SIZE(drm_panel_orientation_enum_list));
> + if (!prop)
> + return -ENOMEM;
> +
> + dev->mode_config.panel_orientation_property = prop;
> + drm_object_attach_property(&connector->base, prop,
> + DRM_MODE_PANEL_ORIENTATION_UNKNOWN);
> +
> + return 0;
> +}
> +EXPORT_SYMBOL(drm_connector_init_panel_orientation_property);
> +
> int drm_connector_set_obj_prop(struct drm_mode_object *obj,
> struct drm_property *property,
> uint64_t value)
> diff --git a/include/drm/drm_connector.h b/include/drm/drm_connector.h
> index 1922b278ffad..4396c1c4a5db 100644
> --- a/include/drm/drm_connector.h
> +++ b/include/drm/drm_connector.h
> @@ -1696,6 +1696,8 @@ int drm_connector_set_panel_orientation_with_quirk(
> struct drm_connector *connector,
> enum drm_panel_orientation panel_orientation,
> int width, int height);
> +int drm_connector_init_panel_orientation_property(
> + struct drm_connector *connector);
> int drm_connector_attach_max_bpc_property(struct drm_connector *connector,
> int min, int max);
>
> --
> 2.31.1.498.g6c1eba8ee3d-goog
>
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