diff options
Diffstat (limited to 'drivers/gpu/drm/drm_hdcp.c')
| -rw-r--r-- | drivers/gpu/drm/drm_hdcp.c | 77 |
1 files changed, 76 insertions, 1 deletions
diff --git a/drivers/gpu/drm/drm_hdcp.c b/drivers/gpu/drm/drm_hdcp.c index cd837bd409f7..9191633a3c43 100644 --- a/drivers/gpu/drm/drm_hdcp.c +++ b/drivers/gpu/drm/drm_hdcp.c @@ -271,6 +271,13 @@ exit: * * SRM should be presented in the name of "display_hdcp_srm.bin". * + * Format of the SRM table, that userspace needs to write into the binary file, + * is defined at: + * 1. Renewability chapter on 55th page of HDCP 1.4 specification + * https://www.digital-cp.com/sites/default/files/specifications/HDCP%20Specification%20Rev1_4_Secure.pdf + * 2. Renewability chapter on 63rd page of HDCP 2.2 specification + * https://www.digital-cp.com/sites/default/files/specifications/HDCP%20on%20HDMI%20Specification%20Rev2_2_Final1.pdf + * * Returns: * TRUE on any of the KSV is revoked, else FALSE. */ @@ -344,23 +351,45 @@ static struct drm_prop_enum_list drm_cp_enum_list[] = { }; DRM_ENUM_NAME_FN(drm_get_content_protection_name, drm_cp_enum_list) +static struct drm_prop_enum_list drm_hdcp_content_type_enum_list[] = { + { DRM_MODE_HDCP_CONTENT_TYPE0, "HDCP Type0" }, + { DRM_MODE_HDCP_CONTENT_TYPE1, "HDCP Type1" }, +}; +DRM_ENUM_NAME_FN(drm_get_hdcp_content_type_name, + drm_hdcp_content_type_enum_list) + /** * drm_connector_attach_content_protection_property - attach content protection * property * * @connector: connector to attach CP property on. + * @hdcp_content_type: is HDCP Content Type property needed for connector * * This is used to add support for content protection on select connectors. * Content Protection is intentionally vague to allow for different underlying * technologies, however it is most implemented by HDCP. * + * When hdcp_content_type is true enum property called HDCP Content Type is + * created (if it is not already) and attached to the connector. + * + * This property is used for sending the protected content's stream type + * from userspace to kernel on selected connectors. Protected content provider + * will decide their type of their content and declare the same to kernel. + * + * Content type will be used during the HDCP 2.2 authentication. + * Content type will be set to &drm_connector_state.hdcp_content_type. + * * The content protection will be set to &drm_connector_state.content_protection * + * When kernel triggered content protection state change like DESIRED->ENABLED + * and ENABLED->DESIRED, will use drm_hdcp_update_content_protection() to update + * the content protection state of a connector. + * * Returns: * Zero on success, negative errno on failure. */ int drm_connector_attach_content_protection_property( - struct drm_connector *connector) + struct drm_connector *connector, bool hdcp_content_type) { struct drm_device *dev = connector->dev; struct drm_property *prop = @@ -377,6 +406,52 @@ int drm_connector_attach_content_protection_property( DRM_MODE_CONTENT_PROTECTION_UNDESIRED); dev->mode_config.content_protection_property = prop; + if (!hdcp_content_type) + return 0; + + prop = dev->mode_config.hdcp_content_type_property; + if (!prop) + prop = drm_property_create_enum(dev, 0, "HDCP Content Type", + drm_hdcp_content_type_enum_list, + ARRAY_SIZE( + drm_hdcp_content_type_enum_list)); + if (!prop) + return -ENOMEM; + + drm_object_attach_property(&connector->base, prop, + DRM_MODE_HDCP_CONTENT_TYPE0); + dev->mode_config.hdcp_content_type_property = prop; + return 0; } EXPORT_SYMBOL(drm_connector_attach_content_protection_property); + +/** + * drm_hdcp_update_content_protection - Updates the content protection state + * of a connector + * + * @connector: drm_connector on which content protection state needs an update + * @val: New state of the content protection property + * + * This function can be used by display drivers, to update the kernel triggered + * content protection state changes of a drm_connector such as DESIRED->ENABLED + * and ENABLED->DESIRED. No uevent for DESIRED->UNDESIRED or ENABLED->UNDESIRED, + * as userspace is triggering such state change and kernel performs it without + * fail.This function update the new state of the property into the connector's + * state and generate an uevent to notify the userspace. + */ +void drm_hdcp_update_content_protection(struct drm_connector *connector, + u64 val) +{ + struct drm_device *dev = connector->dev; + struct drm_connector_state *state = connector->state; + + WARN_ON(!drm_modeset_is_locked(&dev->mode_config.connection_mutex)); + if (state->content_protection == val) + return; + + state->content_protection = val; + drm_sysfs_connector_status_event(connector, + dev->mode_config.content_protection_property); +} +EXPORT_SYMBOL(drm_hdcp_update_content_protection); |