kms_frontbuffer_tracking: Skip on unreliable CRC.

Even with all sink crc re-works we still have platforms
where after 6 vblanks it is unable to calculate the
sink crc. But if we don't get the sink crc it isn't true
that test failed, but that we have no ways to say test
passed or failed.

So let's print a message and move forward in case sink crc
cannot help us to know if the screen has been updated.

v2: Also include a message on setup_sink_crc and also
only skip when it is mandatory, i.e. when running for PSR.

Acked-by: Paulo Zanoni <paulo.r.zanoni@intel.com>
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>

1 files changed, 25 insertions, 12 deletions

diff --git a/tests/kms_frontbuffer_tracking.c b/tests/kms_frontbuffer_tracking.c
index bc91d3e7..23c2b065 100644
--- a/tests/kms_frontbuffer_tracking.c
+++ b/tests/kms_frontbuffer_tracking.c
@@ -859,12 +859,22 @@ static bool psr_wait_until_enabled(void)
 #define psr_enable() igt_set_module_param_int("enable_psr", 1)
 #define psr_disable() igt_set_module_param_int("enable_psr", 0)
 
-static void get_sink_crc(sink_crc_t *crc)
+static void get_sink_crc(sink_crc_t *crc, bool mandatory)
 {
+	int rc, errno_;
+
 	lseek(sink_crc.fd, 0, SEEK_SET);
 
-	igt_assert(read(sink_crc.fd, crc->data, SINK_CRC_SIZE) ==
-		   SINK_CRC_SIZE);
+	rc = read(sink_crc.fd, crc->data, SINK_CRC_SIZE);
+	errno_ = errno;
+
+	if (rc == -1 && errno_ == ETIMEDOUT) {
+		if (mandatory)
+			igt_skip("Sink CRC is unreliable on this machine. Try running this test again individually\n");
+		else
+			igt_info("Sink CRC is unreliable on this machine. Try running this test again individually\n");
+	}
+	igt_assert(rc == SINK_CRC_SIZE);
 }
 
 static bool sink_crc_equal(sink_crc_t *a, sink_crc_t *b)
@@ -1148,17 +1158,17 @@ static void print_crc(const char *str, struct both_crcs *crc)
 	free(pipe_str);
 }
 
-static void collect_crcs(struct both_crcs *crcs)
+static void collect_crcs(struct both_crcs *crcs, bool mandatory_sink_crc)
 {
 	igt_pipe_crc_collect_crc(pipe_crc, &crcs->pipe);
 
 	if (sink_crc.supported)
-		get_sink_crc(&crcs->sink);
+		get_sink_crc(&crcs->sink, mandatory_sink_crc);
 	else
 		memcpy(&crcs->sink, "unsupported!", SINK_CRC_SIZE);
 }
 
-static void init_blue_crc(enum pixel_format format)
+static void init_blue_crc(enum pixel_format format, bool mandatory_sink_crc)
 {
 	struct igt_fb blue;
 	int rc;
@@ -1176,7 +1186,7 @@ static void init_blue_crc(enum pixel_format format)
 			    blue.fb_id, 0, 0, &prim_mode_params.connector_id, 1,
 			    prim_mode_params.mode);
 	igt_assert_eq(rc, 0);
-	collect_crcs(&blue_crcs[format].crc);
+	collect_crcs(&blue_crcs[format].crc, mandatory_sink_crc);
 
 	print_crc("Blue CRC:  ", &blue_crcs[format].crc);
 
@@ -1188,7 +1198,8 @@ static void init_blue_crc(enum pixel_format format)
 }
 
 static void init_crcs(enum pixel_format format,
-		      struct draw_pattern_info *pattern)
+		      struct draw_pattern_info *pattern,
+		      bool mandatory_sink_crc)
 {
 	int r, r_, rc;
 	struct igt_fb tmp_fbs[pattern->n_rects];
@@ -1224,7 +1235,7 @@ static void init_crcs(enum pixel_format format,
 				   &prim_mode_params.connector_id, 1,
 				   prim_mode_params.mode);
 		igt_assert_eq(rc, 0);
-		collect_crcs(&pattern->crcs[format][r]);
+		collect_crcs(&pattern->crcs[format][r], mandatory_sink_crc);
 	}
 
 	for (r = 0; r < pattern->n_rects; r++) {
@@ -1345,6 +1356,8 @@ static void setup_sink_crc(void)
 	errno_ = errno;
 	if (rc == -1 && errno_ == ENOTTY)
 		igt_info("Sink CRC not supported: panel doesn't support it\n");
+	if (rc == -1 && errno_ == ETIMEDOUT)
+		igt_info("Sink CRC not reliable on this panel: skipping it\n");
 	else if (rc == SINK_CRC_SIZE)
 		sink_crc.supported = true;
 	else
@@ -1577,7 +1590,7 @@ static int adjust_assertion_flags(const struct test_mode *t, int flags)
 	if (!opt.check_crc || (flags__ & DONT_ASSERT_CRC))		\
 		break;							\
 									\
-	collect_crcs(&crc_);						\
+	collect_crcs(&crc_, mandatory_sink_crc);			\
 	print_crc("Calculated CRC:", &crc_);				\
 									\
 	igt_assert(wanted_crc);						\
@@ -1797,9 +1810,9 @@ static void prepare_subtest_data(const struct test_mode *t,
 
 	unset_all_crtcs();
 
-	init_blue_crc(t->format);
+	init_blue_crc(t->format, t->feature & FEATURE_PSR);
 	if (pattern)
-		init_crcs(t->format, pattern);
+		init_crcs(t->format, pattern, t->feature & FEATURE_PSR);
 
 	enable_features_for_test(t);
 }