drm/dp: Add DPCD defines for register 0x007
Low four bits are downstream port count. High bit indicates peer OUI
support. OUI matching will allow us to do additional per-sink handling
for things like DP->VGA bandwidth limits or (hopefully) the iMac-as-
display hack.
Signed-off-by: Adam Jackson <ajax@redhat.com>
Reviewed-by: Jerome Glisse <jglisse@redhat.com>
Acked-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Acked-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
diff --git a/include/drm/drm_dp_helper.h b/include/drm/drm_dp_helper.h
index 8ed85b9..1744b18c 100644
--- a/include/drm/drm_dp_helper.h
+++ b/include/drm/drm_dp_helper.h
@@ -72,6 +72,10 @@
#define DP_MAIN_LINK_CHANNEL_CODING 0x006
+#define DP_DOWN_STREAM_PORT_COUNT 0x007
+#define DP_PORT_COUNT_MASK 0x0f
+#define DP_OUI_SUPPORT (1 << 7)
+
#define DP_EDP_CONFIGURATION_CAP 0x00d
#define DP_TRAINING_AUX_RD_INTERVAL 0x00e