drm/i915: HDCP: fix Ri prime check done during link check

The check was always succeeding even in case of a mismatch due to the
HDCP_STATUS_ENC bit being set. Make sure both bits are actually set.

Signed-off-by: Oliver Barta <oliver.barta@aptiv.com>
Fixes: 2320175feb74 ("drm/i915: Implement HDCP for HDMI")
Reviewed-by: Ramalingam C <ramalingam.c@intel.com>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20200328104100.12162-1-oliver.barta@aptiv.com

diff --git a/drivers/gpu/drm/i915/display/intel_hdmi.c b/drivers/gpu/drm/i915/display/intel_hdmi.c
index 011d83c..6b1bc95 100644 (file)
--- a/drivers/gpu/drm/i915/display/intel_hdmi.c
+++ b/drivers/gpu/drm/i915/display/intel_hdmi.c
@@ -1561,7 +1561,8 @@ bool intel_hdmi_hdcp_check_link(struct intel_digital_port *intel_dig_port)
        intel_de_write(i915, HDCP_RPRIME(i915, cpu_transcoder, port), ri.reg);
 
        /* Wait for Ri prime match */
-       if (wait_for(intel_de_read(i915, HDCP_STATUS(i915, cpu_transcoder, port)) &
+       if (wait_for((intel_de_read(i915, HDCP_STATUS(i915, cpu_transcoder, port)) &
+                     (HDCP_STATUS_RI_MATCH | HDCP_STATUS_ENC)) ==
                     (HDCP_STATUS_RI_MATCH | HDCP_STATUS_ENC), 1)) {
                drm_err(&i915->drm,
                        "Ri' mismatch detected, link check failed (%x)\n",