If a HDCP repeater is detected with zero downstream devices, HDCP spec approves either of below actions: 1. Dont continue on second stage authentication. Disable encryption. 2. Continue with second stage authentication excluding the KSV list and on success, continue encryption. Since disable encryption is agreed, repeater is not expected to have its own display. So there is no consumption of the display content in such setup. Hence, incase of repeater with zero device count, this patch fails the HDCP authentication and stops the HDCP encryption. v2: Rephrased commit msg and added comments in code [Seanpaul] v3: No changes. Added Reviewed-by tag. Signed-off-by: Ramalingam C <ramalingam.c@xxxxxxxxx> Reviewed-by: Sean Paul <seanpaul@xxxxxxxxxxxx> --- drivers/gpu/drm/i915/intel_hdcp.c | 10 ++++++++-- 1 file changed, 8 insertions(+), 2 deletions(-) diff --git a/drivers/gpu/drm/i915/intel_hdcp.c b/drivers/gpu/drm/i915/intel_hdcp.c index de9a925c122d..0a1ef82c77a2 100644 --- a/drivers/gpu/drm/i915/intel_hdcp.c +++ b/drivers/gpu/drm/i915/intel_hdcp.c @@ -166,10 +166,16 @@ int intel_hdcp_auth_downstream(struct intel_digital_port *intel_dig_port, return -EPERM; } - /* If there are no downstream devices, we're all done. */ + /* + * When repeater reports 0 device count, HDCP1.4 spec allows disabling + * the HDCP encryption. That implies that repeater can't have its own + * display. As there is no consumption of encrypted content in the + * repeater with 0 downstream devices, we are failing the + * authentication. + */ num_downstream = DRM_HDCP_NUM_DOWNSTREAM(bstatus[0]); if (num_downstream == 0) - return 0; + return -EINVAL; ksv_fifo = kzalloc(num_downstream * DRM_HDCP_KSV_LEN, GFP_KERNEL); if (!ksv_fifo) -- 2.7.4 _______________________________________________ Intel-gfx mailing list Intel-gfx@xxxxxxxxxxxxxxxxxxxxx https://lists.freedesktop.org/mailman/listinfo/intel-gfx
