Signed-off-by: Imre Deak <imre.d...@intel.com>
---
 tests/flip_test.c |   29 +++++++++++++++++++++++++++--
 1 file changed, 27 insertions(+), 2 deletions(-)

diff --git a/tests/flip_test.c b/tests/flip_test.c
index 9772599..82ab347 100644
--- a/tests/flip_test.c
+++ b/tests/flip_test.c
@@ -75,6 +75,7 @@ struct event_state {
         */
        struct timeval last_ts;                 /* kernel reported timestamp */
        struct timeval last_received_ts;        /* the moment we received it */
+       unsigned int last_seq;                  /* kernel reported seq. num */
 
        /*
         * Event data for for the current event that we just received and
@@ -82,8 +83,12 @@ struct event_state {
         */
        struct timeval current_ts;              /* kernel reported timestamp */
        struct timeval current_received_ts;     /* the moment we received it */
+       unsigned int current_seq;               /* kernel reported seq. num */
 
        int count;                              /* # of events of this type */
+
+       /* Step between the current and next 'target' sequence number. */
+       int seq_step;
 };
 
 struct test_output {
@@ -223,6 +228,7 @@ static void event_handler(struct event_state *es, unsigned 
int frame,
        gettimeofday(&es->current_received_ts, NULL);
        es->current_ts.tv_sec = sec;
        es->current_ts.tv_usec = usec;
+       es->current_seq = frame;
 }
 
 static void page_flip_handler(int fd, unsigned int frame, unsigned int sec,
@@ -256,10 +262,20 @@ static void check_state(struct test_output *o, struct 
event_state *es)
                exit(6);
        }
 
+       if (es->count == 0)
+               return;
 
-       if (es->count > 0 && (o->flags & TEST_CHECK_TS) && 
(!analog_tv_connector(o))) {
+       /* This bounding matches the one in DRM_IOCTL_WAIT_VBLANK. */
+       if (es->current_seq - (es->last_seq + es->seq_step) > 1UL << 23) {
+               fprintf(stderr, "unexpected %s seq %u, should be >= %u\n",
+                       es->name, es->current_seq, es->last_seq + es->seq_step);
+               exit(10);
+       }
+
+       if ((o->flags & TEST_CHECK_TS) && (!analog_tv_connector(o))) {
                timersub(&es->current_ts, &es->last_ts, &diff);
-               usec_interflip = 1.0 / ((double)o->mode.vrefresh) * 1000.0 * 
1000.0;
+               usec_interflip = (double)es->seq_step /
+                                ((double)o->mode.vrefresh) * 1000.0 * 1000.0;
                if (fabs((((double) diff.tv_usec) - usec_interflip) /
                    usec_interflip) > 0.005) {
                        fprintf(stderr, "inter-%s ts jitter: %is, %ius\n",
@@ -269,6 +285,12 @@ static void check_state(struct test_output *o, struct 
event_state *es)
                         * poll helper :( hence make it non-fatal for now */
                        //exit(9);
                }
+
+               if (es->current_seq != es->last_seq + es->seq_step)
+                       fprintf(stderr, "unexpected %s seq %u, expected %u\n",
+                                       es->name, es->current_seq,
+                                       es->last_seq + es->seq_step);
+                       /* no exit, due to the same reason as above */
        }
 }
 
@@ -361,6 +383,7 @@ static void update_state(struct event_state *es)
 {
        es->last_received_ts = es->current_received_ts;
        es->last_ts = es->current_ts;
+       es->last_seq = es->current_seq;
        es->count++;
 }
 
@@ -499,6 +522,7 @@ static void check_final_state(struct test_output *o, struct 
event_state *es,
                int expected;
                int count = es->count;
 
+               count *= es->seq_step;
                expected = ellapsed * o->mode.vrefresh / (1000 * 1000);
                if (count < expected * 99/100) {
                        fprintf(stderr, "dropped frames, expected %d, counted 
%d, encoder type %d\n",
@@ -640,6 +664,7 @@ static void flip_mode(struct test_output *o, int duration)
        wait_for_events(o);
 
        o->current_fb_id = 1;
+       o->flip_state.seq_step = 1;
 
        ellapsed = event_loop(o, duration);
 
-- 
1.7.9.5

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