[PATCH i-g-t v3 3/4] tests/intel/kms_pm_dc: Add polling for deep-pkgc

[Naladala Ramanaidu]

Added vblank wait to synchronize with frame time. Replaced
read_pkgc_counter function with igt_wait function to poll for
PKGC10 every 5ms until 2 frame times are reached.

v2: Address and correct review comments (Suraj, Jeevan)
v3: Update commit subject/message.  (Kamil)

Signed-off-by: Naladala Ramanaidu <ramanaidu.naladala at intel.com>
---
 tests/intel/kms_pm_dc.c | 11 ++++++-----
 1 file changed, 6 insertions(+), 5 deletions(-)

diff --git a/tests/intel/kms_pm_dc.c b/tests/intel/kms_pm_dc.c
index 09d362694..92c146d6c 100644
--- a/tests/intel/kms_pm_dc.c
+++ b/tests/intel/kms_pm_dc.c
@@ -635,23 +635,24 @@ static void test_deep_pkgc_state(data_t *data)
 	setup_videoplayback(data);
 
 	primary = igt_output_get_plane_type(data->output, DRM_PLANE_TYPE_PRIMARY);
-	pre_val = read_pkgc_counter(data->debugfs_root_fd);
-	delay = 1 * (MSECS / (data->mode->vrefresh - 10));
-
 	igt_plane_set_fb(primary, &data->fb_rgb);
 	igt_display_commit(&data->display);
+	/* Waiting for the vblank to sync the frame time */
+	igt_wait_for_vblank_count(data->drm_fd, data->display.pipes[pipe].crtc_offset, 1);
+	pre_val = read_pkgc_counter(data->debugfs_root_fd);
+	usleep(delay * 0.5);
 
 	while (time(NULL) - start < duration) {
 		flip = !flip;
 		igt_plane_set_fb(primary, flip ? &data->fb_rgb : &data->fb_rgr);
 		igt_display_commit(&data->display);
+		igt_wait((cur_val = read_pkgc_counter(data->debugfs_root_fd)) > pre_val,
+			 delay * 2, 5);
 
-		cur_val = read_pkgc_counter(data->debugfs_root_fd);
 		if (cur_val > pre_val) {
 			pkgc_flag = true;
 			break;
 		}
-		usleep(delay);
 	}
 
 	cleanup_dc3co_fbs(data);
-- 
2.43.0