[RFC PATCH v2 05/18] rust: drm: expose <drm/display/drm_hdcp.h> HDCP 2.2 message definitions

[Mike Lothian]

Add <drm/display/drm_hdcp.h> to the bindings so Rust DRM drivers can use
the canonical HDCP 2.2 message IDs (HDCP_2_2_AKE_INIT ..
HDCP_2_2_REP_STREAM_READY), length constants and hdcp2_* message structs
instead of redefining them. The header only pulls in <linux/types.h>, so
it adds no new heavy dependencies.

The Vino DisplayLink DL3 driver uses these for its HDCP 2.2 AKE/LC/SKE
handshake (carried over a vendor USB transport rather than the DP/HDMI
HDCP transport, so only the message definitions are reused, not the
drm_hdcp_helper state machine).

Signed-off-by: Mike Lothian <mike@xxxxxxxxxxxxxx>
Assisted-by: Claude:claude-sonnet-5 [Claude-Code]
---
 rust/bindings/bindings_helper.h | 1 +
 1 file changed, 1 insertion(+)

diff --git a/rust/bindings/bindings_helper.h b/rust/bindings/bindings_helper.h
index e41d2716fb2e..e5cfda610781 100644
--- a/rust/bindings/bindings_helper.h
+++ b/rust/bindings/bindings_helper.h
@@ -34,6 +34,7 @@
 
 #include <linux/acpi.h>
 #include <linux/gpu_buddy.h>
+#include <drm/display/drm_hdcp.h>
 #include <drm/drm_atomic.h>
 #include <drm/drm_atomic_helper.h>
 #include <drm/drm_connector.h>
-- 
2.55.0