Hello Juha-Pekka,
I am sorry, this is not needed.
Thank you so much.
Regards
Vidya
-----Original Message-----
From: Juha-Pekka Heikkila <juhapekka.heikkila@xxxxxxxxx>
Sent: Thursday, May 27, 2021 8:40 PM
To: Srinivas, Vidya <vidya.srinivas@xxxxxxxxx>; intel-gfx@xxxxxxxxxxxxxxxxxxxxx; igt-dev@xxxxxxxxxxxxxxxxxxxxx
Cc: Lin, Charlton <charlton.lin@xxxxxxxxx>
Subject: Re: [igt-dev] [PATCH 4/4] [RFC] tests/kms_big_fb: Wait for vblank before collecting CRC
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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