diff options
| -rw-r--r-- | drivers/gpu/drm/i915/intel_hdcp.c | 6 | ||||
| -rw-r--r-- | include/drm/drm_hdcp.h | 2 |
2 files changed, 8 insertions, 0 deletions
diff --git a/drivers/gpu/drm/i915/intel_hdcp.c b/drivers/gpu/drm/i915/intel_hdcp.c index b50c03a3bfe6..db9527173a1e 100644 --- a/drivers/gpu/drm/i915/intel_hdcp.c +++ b/drivers/gpu/drm/i915/intel_hdcp.c @@ -160,6 +160,12 @@ int intel_hdcp_auth_downstream(struct intel_digital_port *intel_dig_port, if (ret) return ret; + if (DRM_HDCP_MAX_DEVICE_EXCEEDED(bstatus[0]) || + DRM_HDCP_MAX_CASCADE_EXCEEDED(bstatus[1])) { + DRM_ERROR("Max Topology Limit Exceeded\n"); + return -EPERM; + } + /* If there are no downstream devices, we're all done. */ num_downstream = DRM_HDCP_NUM_DOWNSTREAM(bstatus[0]); if (num_downstream == 0) { diff --git a/include/drm/drm_hdcp.h b/include/drm/drm_hdcp.h index 43f7bd902b41..562fa7df2637 100644 --- a/include/drm/drm_hdcp.h +++ b/include/drm/drm_hdcp.h @@ -20,6 +20,8 @@ #define DRM_HDCP_V_PRIME_PART_LEN 4 #define DRM_HDCP_V_PRIME_NUM_PARTS 5 #define DRM_HDCP_NUM_DOWNSTREAM(x) (x & 0x3f) +#define DRM_HDCP_MAX_CASCADE_EXCEEDED(x) (x & BIT(3)) +#define DRM_HDCP_MAX_DEVICE_EXCEEDED(x) (x & BIT(7)) /* Slave address for the HDCP registers in the receiver */ #define DRM_HDCP_DDC_ADDR 0x3A |