kms_content_protection: Confirm that LIC is passed

Once the HDCP is enabled, kernel will run the link integrity check(LIC)
atleast once in 2Secs based on the HDCP versions.

So to confirm the link integrity check is passed, we oberve that HDCP
state remains ENABLED for next 4Secs.

v2:
  Rebased.

Signed-off-by: Ramalingam C <ramalingam.c@intel.com>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>

tests/kms_content_protection.c

@@ -214,6 +214,14 @@ static bool igt_pipe_is_free(igt_display_t *display, enum pipe pipe)
 	return true;
 }
 
+static void test_cp_lic(igt_output_t *output)
+{
+	bool ret;
+
+	/* Wait for 4Secs (min 2 cycles of Link Integrity Check) */
+	ret = wait_for_prop_value(output, 1, 4 * 1000);
+	igt_assert_f(!ret, "Content Protection LIC Failed\n");
+}
 
 static void test_content_protection_on_output(igt_output_t *output,
 					      enum igt_commit_style s,
@@ -239,6 +247,7 @@ static void test_content_protection_on_output(igt_output_t *output,
 
 		modeset_with_fb(pipe, output, s);
 		test_cp_enable_with_retry(output, s, 3);
+		test_cp_lic(output);
 
 		if (dpms_test) {
 			igt_pipe_set_prop_value(display, pipe,