From: Lyude Paul <[email protected]>

I ended up hitting some bugs when writing nouveau's CRC implementation
due to incorrectly handling the situation where we disable CRCs on a
pipe that already been disabled, which ended up causing some other vague
igt issues when running certain tests in multi-mode.

So, let's add a trivial test for this scenario while we're at it.

Signed-off-by: Lyude Paul <[email protected]>
---
 tests/kms_pipe_crc_basic.c | 38 ++++++++++++++++++++++++++++++++++++++
 1 file changed, 38 insertions(+)

diff --git a/tests/kms_pipe_crc_basic.c b/tests/kms_pipe_crc_basic.c
index f121e27e..4a58332a 100644
--- a/tests/kms_pipe_crc_basic.c
+++ b/tests/kms_pipe_crc_basic.c
@@ -152,6 +152,41 @@ static void test_read_crc(data_t *data, enum pipe pipe, 
unsigned flags)
        }
 }
 
+static void test_disable_crc_after_crtc(data_t *data, enum pipe pipe)
+{
+       igt_display_t *display = &data->display;
+       igt_output_t *output = igt_get_single_output_for_pipe(&data->display, 
pipe);
+       igt_pipe_crc_t *pipe_crc = igt_pipe_crc_new(data->drm_fd, pipe, "auto");
+       drmModeModeInfo *mode = igt_output_get_mode(output);
+       igt_crc_t crc[2];
+
+       igt_display_reset(display);
+       igt_output_set_pipe(output, pipe);
+
+       igt_create_color_fb(data->drm_fd,
+                           mode->hdisplay, mode->vdisplay,
+                           DRM_FORMAT_XRGB8888,
+                           LOCAL_DRM_FORMAT_MOD_NONE,
+                           0.0, 1.0, 0.0, &data->fb);
+       igt_plane_set_fb(igt_output_get_plane(output, 0), &data->fb);
+       igt_display_commit(display);
+
+       igt_pipe_crc_start(pipe_crc);
+       igt_pipe_crc_get_current(data->drm_fd, pipe_crc, &crc[0]);
+
+       kmstest_set_connector_dpms(data->drm_fd, output->config.connector,
+                                  DRM_MODE_DPMS_OFF);
+       igt_pipe_crc_stop(pipe_crc);
+
+       kmstest_set_connector_dpms(data->drm_fd, output->config.connector,
+                                  DRM_MODE_DPMS_ON);
+       igt_pipe_crc_collect_crc(pipe_crc, &crc[1]);
+       igt_assert_crc_equal(&crc[0], &crc[1]);
+
+       igt_pipe_crc_free(pipe_crc);
+       igt_remove_fb(data->drm_fd, &data->fb);
+}
+
 data_t data = {0, };
 
 igt_main
@@ -196,6 +231,9 @@ igt_main
                        test_read_crc(&data, pipe, 0);
                }
 
+               igt_subtest_f("disable-crc-after-crtc-pipe-%s", 
kmstest_pipe_name(pipe))
+                       test_disable_crc_after_crtc(&data, pipe);
+
                igt_subtest_f("hang-read-crc-pipe-%s", kmstest_pipe_name(pipe)) 
{
                        igt_hang_t hang = igt_allow_hang(data.drm_fd, 0, 0);
 
-- 
2.24.1

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