Introduce new attributes to configure EDID of a connector: - edid_enable - chose if the connector will have an EDID or not - edid - raw edid content
Due to limitation of ConfigFS, the max len of EDID is PAGE_SIZE (4kB on x86), it should be sufficient for many tests. One possible evolution is using a ConfigFS blob to allow bigger EDID. Reviewed-by: Luca Ceresoli <[email protected]> Signed-off-by: Louis Chauvet <[email protected]> --- Documentation/ABI/testing/configfs-vkms | 14 ++++++ Documentation/gpu/vkms.rst | 5 ++- drivers/gpu/drm/vkms/vkms_configfs.c | 80 +++++++++++++++++++++++++++++++++ drivers/gpu/drm/vkms/vkms_connector.c | 3 ++ 4 files changed, 101 insertions(+), 1 deletion(-) diff --git a/Documentation/ABI/testing/configfs-vkms b/Documentation/ABI/testing/configfs-vkms index f750e616be54..4061ada5d88b 100644 --- a/Documentation/ABI/testing/configfs-vkms +++ b/Documentation/ABI/testing/configfs-vkms @@ -48,6 +48,20 @@ Description: Value is a bitfield, where 0x1 = NO_DATA, 0x2 = SMPTE_170M_YCC, etc. See enum drm_colorspace for full list. +What: /sys/kernel/config/vkms/<device>/connectors/<connector>/edid_enabled +Date: Nov 2025 +Contact: [email protected] +Description: + Enable or disable EDID for this connector. Value: + 1 - enabled, 0 - disabled. + +What: /sys/kernel/config/vkms/<device>/connectors/<connector>/edid +Date: Nov 2025 +Contact: [email protected] +Description: + Content of the EDID for this connector. Ignored if + edid_enabled is not set. + What: /sys/kernel/config/vkms/<device>/connectors/<connector>/possible_encoders Date: Nov 2025 Contact: [email protected] diff --git a/Documentation/gpu/vkms.rst b/Documentation/gpu/vkms.rst index 1c4a8023374c..60367fd1bd65 100644 --- a/Documentation/gpu/vkms.rst +++ b/Documentation/gpu/vkms.rst @@ -138,7 +138,7 @@ Last but not least, create one or more connectors:: sudo mkdir /config/vkms/my-vkms/connectors/connector0 -Connectors have 3 configurable attribute: +Connectors have 5 configurable attribute: - status: Connection status: 1 connected, 2 disconnected, 3 unknown (same values as those exposed by the "status" property of a connector) @@ -147,6 +147,9 @@ Connectors have 3 configurable attribute: If supported_colorspaces is not 0, the HDR_OUTPUT_METADATA will also be created. Value is a bitfield, 0x1 = NO_DATA, 0x2 = SMPTE_170M_YCC... see enum drm_colorspace for full list. +- edid_enabled: Enable or not EDID for this connector. Some connectors may not have an + EDID but just a list of modes, this attribute allows to disable EDID property. +- edid: Content of the EDID. Ignored if edid_enabled is not set To finish the configuration, link the different pipeline items:: diff --git a/drivers/gpu/drm/vkms/vkms_configfs.c b/drivers/gpu/drm/vkms/vkms_configfs.c index 90bf6e6995ae..20f5150e8b24 100644 --- a/drivers/gpu/drm/vkms/vkms_configfs.c +++ b/drivers/gpu/drm/vkms/vkms_configfs.c @@ -1271,14 +1271,94 @@ static ssize_t connector_supported_colorspaces_store(struct config_item *item, return count; } +static ssize_t connector_edid_enabled_show(struct config_item *item, char *page) +{ + struct vkms_configfs_connector *connector; + bool enabled; + + connector = connector_item_to_vkms_configfs_connector(item); + + scoped_guard(mutex, &connector->dev->lock) + enabled = vkms_config_connector_get_edid_enabled(connector->config); + + return sprintf(page, "%d\n", enabled); +} + +static ssize_t connector_edid_enabled_store(struct config_item *item, + const char *page, size_t count) +{ + struct vkms_configfs_connector *connector; + struct vkms_config_connector *connector_cfg; + bool enabled; + + connector = connector_item_to_vkms_configfs_connector(item); + connector_cfg = connector->config; + + if (kstrtobool(page, &enabled)) + return -EINVAL; + + scoped_guard(mutex, &connector->dev->lock) + { + vkms_config_connector_set_edid_enabled(connector_cfg, enabled); + + if (connector->dev->enabled && + vkms_config_connector_get_status(connector_cfg) != + connector_status_disconnected) + vkms_trigger_connector_hotplug(connector->dev->config->dev); + } + return count; +} + +static ssize_t connector_edid_show(struct config_item *item, char *page) +{ + struct vkms_configfs_connector *connector; + + connector = connector_item_to_vkms_configfs_connector(item); + + scoped_guard(mutex, &connector->dev->lock) + { + unsigned int len = 0; + const u8 *edid = vkms_config_connector_get_edid(connector->config, &len); + + memcpy(page, edid, min(len, PAGE_SIZE)); + return min(len, PAGE_SIZE); + } + + return -EINVAL; +} + +static ssize_t connector_edid_store(struct config_item *item, + const char *page, size_t count) +{ + struct vkms_configfs_connector *connector; + + connector = connector_item_to_vkms_configfs_connector(item); + + scoped_guard(mutex, &connector->dev->lock) + { + vkms_config_connector_set_edid(connector->config, page, count); + + if (connector->dev->enabled && + vkms_config_connector_get_status(connector->config) != + connector_status_disconnected) + vkms_trigger_connector_hotplug(connector->dev->config->dev); + } + + return count; +} + CONFIGFS_ATTR(connector_, status); CONFIGFS_ATTR(connector_, type); CONFIGFS_ATTR(connector_, supported_colorspaces); +CONFIGFS_ATTR(connector_, edid_enabled); +CONFIGFS_ATTR(connector_, edid); static struct configfs_attribute *connector_item_attrs[] = { &connector_attr_status, &connector_attr_type, &connector_attr_supported_colorspaces, + &connector_attr_edid_enabled, + &connector_attr_edid, NULL, }; diff --git a/drivers/gpu/drm/vkms/vkms_connector.c b/drivers/gpu/drm/vkms/vkms_connector.c index c85d19013720..311858727175 100644 --- a/drivers/gpu/drm/vkms/vkms_connector.c +++ b/drivers/gpu/drm/vkms/vkms_connector.c @@ -143,6 +143,9 @@ struct vkms_connector *vkms_connector_init(struct vkms_device *vkmsdev, drm_connector_helper_add(&connector->base, &vkms_conn_helper_funcs); + if (vkms_config_connector_get_edid_enabled(connector_cfg)) + drm_connector_attach_edid_property(&connector->base); + return connector; } -- 2.51.2
