diff options
| -rw-r--r-- | tests/kms_flip.c | 68 |
1 files changed, 67 insertions, 1 deletions
diff --git a/tests/kms_flip.c b/tests/kms_flip.c index b30e07c9..9829b355 100644 --- a/tests/kms_flip.c +++ b/tests/kms_flip.c @@ -26,6 +26,7 @@ #endif #include "igt.h" + #include <cairo.h> #include <errno.h> #include <fcntl.h> @@ -43,6 +44,7 @@ #include <time.h> #include <pthread.h> +#include "igt_stats.h" #define TEST_DPMS (1 << 0) #define TEST_WITH_DUMMY_BCS (1 << 1) @@ -1301,6 +1303,70 @@ static void free_test_output(struct test_output *o) } } +static void calibrate_ts(struct test_output *o, int crtc_idx) +{ +#define CALIBRATE_TS_STEPS 16 + drmVBlank wait; + igt_stats_t stats; + uint32_t last_seq; + uint64_t last_timestamp; + double expected; + double mean; + double stddev; + int n; + + memset(&wait, 0, sizeof(wait)); + wait.request.type = kmstest_get_vbl_flag(crtc_idx); + wait.request.type |= DRM_VBLANK_ABSOLUTE | DRM_VBLANK_NEXTONMISS; + do_or_die(drmWaitVBlank(drm_fd, &wait)); + + last_seq = wait.reply.sequence; + last_timestamp = wait.reply.tval_sec; + last_timestamp *= 1000000; + last_timestamp += wait.reply.tval_usec; + + memset(&wait, 0, sizeof(wait)); + wait.request.type = kmstest_get_vbl_flag(crtc_idx); + wait.request.type |= DRM_VBLANK_ABSOLUTE | DRM_VBLANK_EVENT; + wait.request.sequence = last_seq; + for (n = 0; n < CALIBRATE_TS_STEPS; n++) { + ++wait.request.sequence; + do_or_die(drmWaitVBlank(drm_fd, &wait)); + } + + igt_stats_init_with_size(&stats, CALIBRATE_TS_STEPS); + for (n = 0; n < CALIBRATE_TS_STEPS; n++) { + struct drm_event_vblank ev; + uint64_t now; + + igt_assert(read(drm_fd, &ev, sizeof(ev)) == sizeof(ev)); + igt_assert_eq(ev.sequence, last_seq + 1); + + now = ev.tv_sec; + now *= 1000000; + now += ev.tv_usec; + + igt_stats_push(&stats, now - last_timestamp); + + last_timestamp = now; + last_seq = ev.sequence; + } + + expected = frame_time(o); + + mean = igt_stats_get_mean(&stats); + stddev = igt_stats_get_std_deviation(&stats); + + igt_info("Expected frametime: %.0fus; measured %.1fus +- %.3fus accuracy %.2f%%\n", + expected, mean, stddev, 100 * 6 * stddev / mean); + igt_assert(6 * stddev / mean < 0.005); /* 99% accuracy within 0.5% */ + + igt_require_f(fabs(mean - expected) < 2*stddev, + "vblank interval differs from modeline! expected %.1fus, measured %1.fus +- %.3fus, difference %.1fus (%.1f sigma)\n", + expected, mean, stddev, + fabs(mean - expected), fabs(mean - expected) / stddev); +} + static void run_test_on_crtc_set(struct test_output *o, int *crtc_idxs, int crtc_count, int duration_ms) { @@ -1404,7 +1470,7 @@ static void run_test_on_crtc_set(struct test_output *o, int *crtc_idxs, /* quiescent the hw a bit so ensure we don't miss a single frame */ if (o->flags & TEST_CHECK_TS) - sleep(1); + calibrate_ts(o, crtc_idxs[0]); igt_assert_eq(do_page_flip(o, o->fb_ids[1], true), 0); wait_for_events(o); |