From: Sean Paul <seanpaul@xxxxxxxxxxxx>
The HDCP 1.4 spec does not require the QUERY_STREAM_ENCRYPTION_STATUS
check, it was always a nice-to-have. After deploying this across various
devices, we've determined that some MST bridge chips do not properly
support this call for HDCP 1.4 (namely Synaptics and Realtek).
I had considered creating a quirk for this, but I think it's more
prudent to just disable the check entirely since I don't have an idea
how widespread support is.
Signed-off-by: Sean Paul <seanpaul@xxxxxxxxxxxx>
---
drivers/gpu/drm/i915/display/intel_dp_hdcp.c | 26 +-------------------
1 file changed, 1 insertion(+), 25 deletions(-)
diff --git a/drivers/gpu/drm/i915/display/intel_dp_hdcp.c b/drivers/gpu/drm/i915/display/intel_dp_hdcp.c
index 03424d20e9f7..b6a9606bf09a 100644
--- a/drivers/gpu/drm/i915/display/intel_dp_hdcp.c
+++ b/drivers/gpu/drm/i915/display/intel_dp_hdcp.c
@@ -640,30 +640,6 @@ intel_dp_mst_hdcp_toggle_signalling(struct intel_digital_port *dig_port,
return ret;
}
-static
-bool intel_dp_mst_hdcp_check_link(struct intel_digital_port *dig_port,
- struct intel_connector *connector)
-{
- struct drm_i915_private *i915 = to_i915(dig_port->base.base.dev);
- struct intel_dp *intel_dp = &dig_port->dp;
- struct drm_dp_query_stream_enc_status_ack_reply reply;
- int ret;
-
- if (!intel_dp_hdcp_check_link(dig_port, connector))
- return false;
-
- ret = drm_dp_send_query_stream_enc_status(&intel_dp->mst_mgr,
- connector->port, &reply);
- if (ret) {
- drm_dbg_kms(&i915->drm,
- "[CONNECTOR:%d:%s] failed QSES ret=%d\n",
- connector->base.base.id, connector->base.name, ret);
- return false;
- }
-
- return reply.auth_completed && reply.encryption_enabled;
-}
-
static const struct intel_hdcp_shim intel_dp_mst_hdcp_shim = {
.write_an_aksv = intel_dp_hdcp_write_an_aksv,
.read_bksv = intel_dp_hdcp_read_bksv,
@@ -674,7 +650,7 @@ static const struct intel_hdcp_shim intel_dp_mst_hdcp_shim = {
.read_ksv_fifo = intel_dp_hdcp_read_ksv_fifo,
.read_v_prime_part = intel_dp_hdcp_read_v_prime_part,
.toggle_signalling = intel_dp_mst_hdcp_toggle_signalling,
- .check_link = intel_dp_mst_hdcp_check_link,
+ .check_link = intel_dp_hdcp_check_link,
.hdcp_capable = intel_dp_hdcp_capable,
.protocol = HDCP_PROTOCOL_DP,
--
Sean Paul, Software Engineer, Google / Chromium OS
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