On 27.5.2021 17.31, Vidya Srinivas wrote:
Without wait for vblank, CRC mismatch is seen
between big and small CRC on some intel Gen11 platforms.
Change-Id: I3bec931aa901130997e693ac1cacf389e2a8100f
Signed-off-by: Vidya Srinivas <vidya.srinivas@xxxxxxxxx>
---
tests/kms_big_fb.c | 10 +++++++---
1 file changed, 7 insertions(+), 3 deletions(-)
diff --git a/tests/kms_big_fb.c b/tests/kms_big_fb.c
index b2027b6b9d1b..da682593429b 100644
--- a/tests/kms_big_fb.c
+++ b/tests/kms_big_fb.c
@@ -254,6 +254,7 @@ static void unset_lut(data_t *data)
static bool test_plane(data_t *data)
{
igt_plane_t *plane = data->plane;
+ igt_display_t *display = &data->display;
struct igt_fb *small_fb = &data->small_fb;
struct igt_fb *big_fb = &data->big_fb;
int w = data->big_fb_width - small_fb->width;
@@ -269,6 +270,7 @@ static bool test_plane(data_t *data)
{ w / 3, h * 3 / 4, },
{ w, h, },
};
+ bool check_platform_intel = is_i915_device(data->drm_fd);
You will not need to do this. This test start with
drm_open_driver_master(DRIVER_INTEL)
hence will always be only on intel device.
if (!igt_plane_has_format_mod(plane, data->format, data->modifier))
return false;
@@ -336,17 +338,19 @@ static bool test_plane(data_t *data)
igt_display_commit2(&data->display, data->display.is_atomic ?
COMMIT_ATOMIC : COMMIT_UNIVERSAL);
-
-
+ if (check_platform_intel)
+ igt_wait_for_vblank(data->drm_fd, display->pipes[data->pipe].crtc_offset);
Above this line there's flip to different framebuffer and below this
line there's restart of crc collection before get any crc. If there's
need to wait a vblank at this place to get matching crcs the actual bug
is somewhere else.
igt_pipe_crc_collect_crc(data->pipe_crc, &small_crc);
igt_plane_set_fb(plane, big_fb);
igt_fb_set_position(big_fb, plane, x, y);
igt_fb_set_size(big_fb, plane, small_fb->width, small_fb->height);
+
igt_plane_set_size(plane, data->width, data->height);
igt_display_commit2(&data->display, data->display.is_atomic ?
COMMIT_ATOMIC : COMMIT_UNIVERSAL);
-
+ if (check_platform_intel)
+ igt_wait_for_vblank(data->drm_fd, display->pipes[data->pipe].crtc_offset);
Here it's the same story as above.
igt_pipe_crc_collect_crc(data->pipe_crc, &big_crc);
igt_plane_set_fb(plane, NULL);
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