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.
The EDID can be changed at any time. As for physical display, you need
to trigger an HPD event to refresh the modes.
Signed-off-by: Louis Chauvet <louis.chauvet@xxxxxxxxxxx>
---
drivers/gpu/drm/vkms/vkms_configfs.c | 33 +++++++++++++++++++++++++++++++++
1 file changed, 33 insertions(+)
diff --git a/drivers/gpu/drm/vkms/vkms_configfs.c b/drivers/gpu/drm/vkms/vkms_configfs.c
index 76f28862c7652fbd9e84c42b60ad818ddee1485b..547b76d67c4cd1f9c2fb20e45f0f0583fa03b59a 100644
--- a/drivers/gpu/drm/vkms/vkms_configfs.c
+++ b/drivers/gpu/drm/vkms/vkms_configfs.c
@@ -814,6 +814,37 @@ static ssize_t connector_status_store(struct config_item *item,
return count;
}
+static ssize_t connector_edid_show(struct config_item *item, char *page)
+{
+ struct vkms_config_connector *connector;
+ struct vkms_configfs_device *vkms_configfs = connector_child_item_to_vkms_configfs_device(item);
+
+ scoped_guard(mutex, &vkms_configfs->lock)
+ {
+ connector = connector_item_to_vkms_configfs_connector(item)->vkms_config_connector;
+ memcpy(page, &connector->edid_blob, connector->edid_blob_len);
+ return connector->edid_blob_len;
+ }
+
+ return -EINVAL;
+}
+
+static ssize_t connector_edid_store(struct config_item *item,
+ const char *page, size_t count)
+{
+ struct vkms_configfs_device *vkms_configfs = connector_child_item_to_vkms_configfs_device(item);
+
+ scoped_guard(mutex, &vkms_configfs->lock)
+ {
+ struct vkms_config_connector *connector =
+ connector_item_to_vkms_configfs_connector(item)->vkms_config_connector;
+ memcpy(&connector->edid_blob, page, count);
+ connector->edid_blob_len = count;
+ }
+
+ return count;
+}
+
static ssize_t connector_id_show(struct config_item *item, char *page)
{
struct vkms_configfs_device *vkms_configfs =
@@ -833,12 +864,14 @@ static ssize_t connector_id_show(struct config_item *item, char *page)
CONFIGFS_ATTR(connector_, type);
CONFIGFS_ATTR(connector_, status);
+CONFIGFS_ATTR(connector_, edid);
CONFIGFS_ATTR_RO(connector_, id);
static struct configfs_attribute *connector_attrs[] = {
&connector_attr_type,
&connector_attr_status,
&connector_attr_id,
+ &connector_attr_edid,
NULL,
};
--
2.47.1
