[igt-dev] [PATCH i-g-t] tests/kms_dp_dsc: Force a full modeset when we force dsc enable

[Manasi Navare]

DSC enable gets configured during compute_config and needs
a full modeset to force DSC.
Sometimes in between the tests, if the initial output is same as the
mode being set for DSC then it will not do a full modeset.
So we disable the output before forcing a mode with DSC enable.

Fixes: db19bccc1c22 ("test/kms_dp_dsc: Basic KMS test to validate VESA DSC on DP/eDP")
Cc: Petri Latvala <petri.latvala at intel.com>
Cc: Anusha Srivatsa <anusha.srivatsa at intel.com>
Cc: Imre Deak <imre.deak at intel.com>
Signed-off-by: Manasi Navare <manasi.d.navare at intel.com>
---
 tests/kms_dp_dsc.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/tests/kms_dp_dsc.c b/tests/kms_dp_dsc.c
index da93cd74..f3a61029 100644
--- a/tests/kms_dp_dsc.c
+++ b/tests/kms_dp_dsc.c
@@ -174,6 +174,11 @@ static void update_display(data_t *data, enum dsc_test_type test_type)
 				      &data->fb_test_pattern);
 		primary = igt_output_get_plane_type(data->output,
 						    DRM_PLANE_TYPE_PRIMARY);
+		/* Disable the output first */
+		igt_plane_set_fb(primary, NULL);
+		igt_output_set_pipe(data->output, PIPE_NONE);
+
+		/* Now set the output to the desired mode */
 		igt_plane_set_fb(primary, &data->fb_test_pattern);
 		igt_display_commit(&data->display);
 
@@ -187,7 +192,7 @@ static void update_display(data_t *data, enum dsc_test_type test_type)
 		clear_dp_dsc_enable(data);
 
 		igt_assert_f(enabled,
-			     "Default DSC enable failed on Connector: %s Pipe: %s",
+			     "\nDefault DSC enable failed on Connector: %s Pipe: %s",
 			     data->conn_name,
 			     kmstest_pipe_name(data->pipe));
 	} else {
-- 
2.19.1