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authorRadhakrishna Sripada <radhakrishna.sripada@intel.com>2018-10-12 21:42:32 +0300
committerRodrigo Vivi <rodrigo.vivi@intel.com>2018-11-02 19:15:58 +0300
commit47e22ff1a9e0c144611bd063b3e6135f9a269503 (patch)
tree3367f379308c138c8802fa5fe69aa3b5468c258e /drivers/gpu/drm/drm_connector.c
parent5468a543409653a94344671371ff784703fdcb26 (diff)
downloadlinux-47e22ff1a9e0c144611bd063b3e6135f9a269503.tar.xz
drm: Add connector property to limit max bpc
At times 12bpc HDMI cannot be driven due to faulty cables, dongles level shifters etc. To workaround them we may need to drive the output at a lower bpc. Currently the user space does not have a way to limit the bpc. The default bpc to be programmed is decided by the driver and is run against connector limitations. Creating a new connector property "max bpc" in order to limit the bpc. xrandr can make use of this connector property to make sure that bpc does not exceed the configured value. This property can be used by userspace to set the bpc. V2: Initialize max_bpc to satisfy kms_properties V3: Move the property to drm_connector V4: Split drm and i915 components(Ville) V5: Make the property per connector(Ville) V6: Compare the requested bpc to connector bpc(Daniel) Move the attach_property function to core(Ville) V7: Fix checkpatch warnings V8: Simplify the connector check code(Ville) V9: Const display_info(Ville) V10,V11: Fix CI issues. V12: Add the Kernel documentation(Daniel) V14: Crossreference the function name in the doc(Daniel) Cc: Ville Syrjälä <ville.syrjala@linux.intel.com> Cc: Daniel Vetter <daniel.vetter@ffwll.ch> Cc: Kishore Kadiyala <kishore.kadiyala@intel.com> Cc: Rodrigo Vivi <rodrigo.vivi@intel.com> Cc: Manasi Navare <manasi.d.navare@intel.com> Cc: Stanislav Lisovskiy <stanislav.lisovskiy@intel.com> Cc: Sunpeng Li <sunpeng.li@amd.com> Acked-by: Daniel Vetter <daniel.vetter@ffwll.ch> Signed-off-by: Radhakrishna Sripada <radhakrishna.sripada@intel.com> Reviewed-by: Rodrigo Vivi <rodrigo.vivi@intel.com> Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20181012184233.29250-1-radhakrishna.sripada@intel.com
Diffstat (limited to 'drivers/gpu/drm/drm_connector.c')
-rw-r--r--drivers/gpu/drm/drm_connector.c41
1 files changed, 41 insertions, 0 deletions
diff --git a/drivers/gpu/drm/drm_connector.c b/drivers/gpu/drm/drm_connector.c
index 4943cef178be..375cdce7df94 100644
--- a/drivers/gpu/drm/drm_connector.c
+++ b/drivers/gpu/drm/drm_connector.c
@@ -916,6 +916,13 @@ DRM_ENUM_NAME_FN(drm_get_content_protection_name, drm_cp_enum_list)
* is no longer protected and userspace should take appropriate action
* (whatever that might be).
*
+ * max bpc:
+ * This range property is used by userspace to limit the bit depth. When
+ * used the driver would limit the bpc in accordance with the valid range
+ * supported by the hardware and sink. Drivers to use the function
+ * drm_connector_attach_max_bpc_property() to create and attach the
+ * property to the connector during initialization.
+ *
* Connectors also have one standardized atomic property:
*
* CRTC_ID:
@@ -1584,6 +1591,40 @@ void drm_connector_set_link_status_property(struct drm_connector *connector,
EXPORT_SYMBOL(drm_connector_set_link_status_property);
/**
+ * drm_connector_attach_max_bpc_property - attach "max bpc" property
+ * @connector: connector to attach max bpc property on.
+ * @min: The minimum bit depth supported by the connector.
+ * @max: The maximum bit depth supported by the connector.
+ *
+ * This is used to add support for limiting the bit depth on a connector.
+ *
+ * Returns:
+ * Zero on success, negative errno on failure.
+ */
+int drm_connector_attach_max_bpc_property(struct drm_connector *connector,
+ int min, int max)
+{
+ struct drm_device *dev = connector->dev;
+ struct drm_property *prop;
+
+ prop = connector->max_bpc_property;
+ if (!prop) {
+ prop = drm_property_create_range(dev, 0, "max bpc", min, max);
+ if (!prop)
+ return -ENOMEM;
+
+ connector->max_bpc_property = prop;
+ }
+
+ drm_object_attach_property(&connector->base, prop, max);
+ connector->state->max_requested_bpc = max;
+ connector->state->max_bpc = max;
+
+ return 0;
+}
+EXPORT_SYMBOL(drm_connector_attach_max_bpc_property);
+
+/**
* drm_connector_init_panel_orientation_property -
* initialize the connecters panel_orientation property
* @connector: connector for which to init the panel-orientation property.