On 2018-10-12 12:44 p.m., Nicholas Kazlauskas wrote:
> Modern display hardware is capable of supporting variable refresh rates.
> This patch introduces the "vrr_capable" property on the connector to
> allow userspace to query support for variable refresh rates.
>
> Atomic drivers should attach this property to connectors that are
> capable of driving variable refresh rates using
> drm_connector_attach_vrr_capable_property().
>
> The value should be updated based on driver and hardware capabiltiy
> by using drm_connector_set_vrr_capable_property().
>
> Signed-off-by: Nicholas Kazlauskas <nicholas.kazlauskas@xxxxxxx>
Reviewed-by: Harry Wentland <harry.wentland@xxxxxxx>
Harry
> ---
> drivers/gpu/drm/drm_connector.c | 49 +++++++++++++++++++++++++++++++++
> include/drm/drm_connector.h | 15 ++++++++++
> 2 files changed, 64 insertions(+)
>
> diff --git a/drivers/gpu/drm/drm_connector.c b/drivers/gpu/drm/drm_connector.c
> index 1e40e5decbe9..f0deeb7298d0 100644
> --- a/drivers/gpu/drm/drm_connector.c
> +++ b/drivers/gpu/drm/drm_connector.c
> @@ -1254,6 +1254,37 @@ int drm_mode_create_scaling_mode_property(struct drm_device *dev)
> }
> EXPORT_SYMBOL(drm_mode_create_scaling_mode_property);
>
> +/**
> + * drm_connector_attach_vrr_capable_property - creates the
> + * vrr_capable property
> + * @connector: connector to create the vrr_capable property on.
> + *
> + * This is used by atomic drivers to add support for querying
> + * variable refresh rate capability for a connector.
> + *
> + * Returns:
> + * Zero on success, negative errono on failure.
> + */
> +int drm_connector_attach_vrr_capable_property(
> + struct drm_connector *connector)
> +{
> + struct drm_device *dev = connector->dev;
> + struct drm_property *prop;
> +
> + if (!connector->vrr_capable_property) {
> + prop = drm_property_create_bool(dev, DRM_MODE_PROP_IMMUTABLE,
> + "vrr_capable");
> + if (!prop)
> + return -ENOMEM;
> +
> + connector->vrr_capable_property = prop;
> + drm_object_attach_property(&connector->base, prop, 0);
> + }
> +
> + return 0;
> +}
> +EXPORT_SYMBOL(drm_connector_attach_vrr_capable_property);
> +
> /**
> * drm_connector_attach_scaling_mode_property - attach atomic scaling mode property
> * @connector: connector to attach scaling mode property on.
> @@ -1582,6 +1613,24 @@ void drm_connector_set_link_status_property(struct drm_connector *connector,
> }
> EXPORT_SYMBOL(drm_connector_set_link_status_property);
>
> +/**
> + * drm_connector_set_vrr_capable_property - sets the variable refresh rate
> + * capable property for a connector
> + * @connector: drm connector
> + * @capable: True if the connector is variable refresh rate capable
> + *
> + * Should be used by atomic drivers to update the indicated support for
> + * variable refresh rate over a connector.
> + */
> +void drm_connector_set_vrr_capable_property(
> + struct drm_connector *connector, bool capable)
> +{
> + drm_object_property_set_value(&connector->base,
> + connector->vrr_capable_property,
> + capable);
> +}
> +EXPORT_SYMBOL(drm_connector_set_vrr_capable_property);
> +
> /**
> * drm_connector_init_panel_orientation_property -
> * initialize the connecters panel_orientation property
> diff --git a/include/drm/drm_connector.h b/include/drm/drm_connector.h
> index 91a877fa00cb..b2263005234a 100644
> --- a/include/drm/drm_connector.h
> +++ b/include/drm/drm_connector.h
> @@ -910,6 +910,17 @@ struct drm_connector {
> */
> struct drm_property *scaling_mode_property;
>
> + /**
> + * @vrr_capable_property: Optional property to help userspace
> + * query hardware support for variable refresh rate on a connector.
> + * connector. Drivers can add the property to a connector by
> + * calling drm_connector_attach_vrr_capable_property().
> + *
> + * This should be updated only by calling
> + * drm_connector_set_vrr_capable_property().
> + */
> + struct drm_property *vrr_capable_property;
> +
> /**
> * @content_protection_property: DRM ENUM property for content
> * protection. See drm_connector_attach_content_protection_property().
> @@ -1183,6 +1194,8 @@ int drm_mode_create_scaling_mode_property(struct drm_device *dev);
> int drm_connector_attach_content_type_property(struct drm_connector *dev);
> int drm_connector_attach_scaling_mode_property(struct drm_connector *connector,
> u32 scaling_mode_mask);
> +int drm_connector_attach_vrr_capable_property(
> + struct drm_connector *connector);
> int drm_connector_attach_content_protection_property(
> struct drm_connector *connector);
> int drm_mode_create_aspect_ratio_property(struct drm_device *dev);
> @@ -1199,6 +1212,8 @@ int drm_connector_update_edid_property(struct drm_connector *connector,
> const struct edid *edid);
> void drm_connector_set_link_status_property(struct drm_connector *connector,
> uint64_t link_status);
> +void drm_connector_set_vrr_capable_property(
> + struct drm_connector *connector, bool capable);
> int drm_connector_init_panel_orientation_property(
> struct drm_connector *connector, int width, int height);
>
>
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