Chris,
Would you be able to make the necessary changes in the suerspace
driver so I can do some testing tomorrow?
Manasi
On Tue, Oct 25, 2016 at 06:16:34PM -0700, Manasi Navare wrote:
> A new optional connector property is added for keeping
> track of whether the link is good (link training passed) or
> link is bad (link training failed). If the link status property
> is Bad, then userspace should fire off a new modeset at the current
> mode even if there have not been any changes in the mode list
> or connector status.
>
> Cc: dri-devel@xxxxxxxxxxxxxxxxxxxxx
> Cc: Jani Nikula <jani.nikula@xxxxxxxxxxxxxxx>
> Cc: Daniel Vetter <daniel.vetter@xxxxxxxxx>
> Cc: Ville Syrjala <ville.syrjala@xxxxxxxxxxxxxxx>
> Cc: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
> Signed-off-by: Manasi Navare <manasi.d.navare@xxxxxxxxx>
> ---
> drivers/gpu/drm/drm_connector.c | 32 ++++++++++++++++++++++++++++++++
> include/drm/drm_connector.h | 1 +
> include/drm/drm_crtc.h | 6 ++++++
> include/uapi/drm/drm_mode.h | 4 ++++
> 4 files changed, 43 insertions(+)
>
> diff --git a/drivers/gpu/drm/drm_connector.c b/drivers/gpu/drm/drm_connector.c
> index 2db7fb5..b4ce19f 100644
> --- a/drivers/gpu/drm/drm_connector.c
> +++ b/drivers/gpu/drm/drm_connector.c
> @@ -588,6 +588,11 @@ int drm_display_info_set_bus_formats(struct drm_display_info *info,
> DRM_ENUM_NAME_FN(drm_get_tv_subconnector_name,
> drm_tv_subconnector_enum_list)
>
> +static const struct drm_prop_enum_list drm_link_status_enum_list[] = {
> + { DRM_MODE_LINK_STATUS_GOOD, "Good" },
> + { DRM_MODE_LINK_STATUS_BAD, "Bad" },
> +};
> +
> int drm_connector_create_standard_properties(struct drm_device *dev)
> {
> struct drm_property *prop;
> @@ -845,6 +850,33 @@ int drm_mode_create_suggested_offset_properties(struct drm_device *dev)
> EXPORT_SYMBOL(drm_mode_create_suggested_offset_properties);
>
> /**
> + * drm_mode_create_link_status_property - Create link status property
> + * @dev: DRM device
> + *
> + * Called by a driver the first time it's needed, must be attached to desired
> + * connectors.
> + * This property is used to indicate whether link sttaus is Good or Bad as
> + * a result fo link training
> + */
> +int drm_mode_create_link_status_property(struct drm_device *dev)
> +{
> + struct drm_property *link_status;
> +
> + if (dev->mode_config.link_status_property)
> + return 0;
> +
> + link_status =
> + drm_property_create_enum(dev, 0, "link-status",
> + drm_link_status_enum_list,
> + ARRAY_SIZE(drm_link_status_enum_list));
> +
> + dev->mode_config.scaling_mode_property = link_status;
> +
> + return 0;
> +}
> +EXPORT_SYMBOL(drm_mode_create_link_status_property);
> +
> +/**
> * drm_mode_connector_set_path_property - set tile property on connector
> * @connector: connector to set property on.
> * @path: path to use for property; must not be NULL.
> diff --git a/include/drm/drm_connector.h b/include/drm/drm_connector.h
> index fc9d475..7234c0c 100644
> --- a/include/drm/drm_connector.h
> +++ b/include/drm/drm_connector.h
> @@ -759,6 +759,7 @@ int drm_mode_create_tv_properties(struct drm_device *dev,
> int drm_mode_create_scaling_mode_property(struct drm_device *dev);
> int drm_mode_create_aspect_ratio_property(struct drm_device *dev);
> int drm_mode_create_suggested_offset_properties(struct drm_device *dev);
> +int drm_mode_create_link_status_property(struct drm_device *dev);
>
> int drm_mode_connector_set_path_property(struct drm_connector *connector,
> const char *path);
> diff --git a/include/drm/drm_crtc.h b/include/drm/drm_crtc.h
> index fa1aa21..3e9c833 100644
> --- a/include/drm/drm_crtc.h
> +++ b/include/drm/drm_crtc.h
> @@ -1343,6 +1343,12 @@ struct drm_mode_config {
> */
> struct drm_property *suggested_y_property;
>
> + /**
> + * @link_status_property: Optional connector property for link status
> + * of the connector as a result of link training.
> + */
> + struct drm_property *link_status_property;
> +
> /* dumb ioctl parameters */
> uint32_t preferred_depth, prefer_shadow;
>
> diff --git a/include/uapi/drm/drm_mode.h b/include/uapi/drm/drm_mode.h
> index 084b50a..f1b0afd 100644
> --- a/include/uapi/drm/drm_mode.h
> +++ b/include/uapi/drm/drm_mode.h
> @@ -121,6 +121,10 @@
> #define DRM_MODE_DIRTY_ON 1
> #define DRM_MODE_DIRTY_ANNOTATE 2
>
> +/* Link Status options */
> +#define DRM_MODE_LINK_STATUS_GOOD 0
> +#define DRM_MODE_LINK_STATUS_BAD 1
> +
> struct drm_mode_modeinfo {
> __u32 clock;
> __u16 hdisplay;
> --
> 1.9.1
>
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