From: Sean Paul seanpaul@chromium.org
This patch updates the connector's property value in 2 cases which were previously missed:
1- Content type changes. The value should revert back to DESIRED from ENABLED in case the driver must re-authenticate the link due to the new content type.
2- Userspace sets value to DESIRED while ENABLED. In this case, the value should be reset immediately to ENABLED since the link is actively being encrypted.
To accommodate these changes, I've split up the conditionals to make things a bit more clear (as much as one can with this mess of state).
Signed-off-by: Sean Paul seanpaul@chromium.org Link: https://patchwork.freedesktop.org/patch/msgid/20210913175747.47456-4-sean@po... #v1
Changes in v2: -None --- drivers/gpu/drm/drm_hdcp.c | 26 +++++++++++++++++--------- 1 file changed, 17 insertions(+), 9 deletions(-)
diff --git a/drivers/gpu/drm/drm_hdcp.c b/drivers/gpu/drm/drm_hdcp.c index dd8fa91c51d6..742313ce8f6f 100644 --- a/drivers/gpu/drm/drm_hdcp.c +++ b/drivers/gpu/drm/drm_hdcp.c @@ -487,21 +487,29 @@ bool drm_hdcp_atomic_check(struct drm_connector *connector, return true;
/* - * Nothing to do if content type is unchanged and one of: - * - state didn't change + * Content type changes require an HDCP disable/enable cycle. + */ + if (new_conn_state->hdcp_content_type != old_conn_state->hdcp_content_type) { + new_conn_state->content_protection = + DRM_MODE_CONTENT_PROTECTION_DESIRED; + return true; + } + + /* + * Ignore meaningless state changes: * - HDCP was activated since the last commit - * - attempting to set to desired while already enabled + * - Attempting to set to desired while already enabled */ - if (old_hdcp == new_hdcp || - (old_hdcp == DRM_MODE_CONTENT_PROTECTION_DESIRED && + if ((old_hdcp == DRM_MODE_CONTENT_PROTECTION_DESIRED && new_hdcp == DRM_MODE_CONTENT_PROTECTION_ENABLED) || (old_hdcp == DRM_MODE_CONTENT_PROTECTION_ENABLED && new_hdcp == DRM_MODE_CONTENT_PROTECTION_DESIRED)) { - if (old_conn_state->hdcp_content_type == - new_conn_state->hdcp_content_type) - return false; + new_conn_state->content_protection = + DRM_MODE_CONTENT_PROTECTION_ENABLED; + return false; }
- return true; + /* Finally, if state changes, we need action */ + return old_hdcp != new_hdcp; } EXPORT_SYMBOL(drm_hdcp_atomic_check);