[igt-dev] [v3 i-g-t 05/14] tests/kms_content_protection: Fix mode selection for 2x tests

[Bhanuprakash Modem]

When two monitors connected through MST, the second monitor also
tries to use the same mode. So two such modes may not fit into the
link bandwidth.

This patch will find a combination of modes that fit into the BW.

Cc: Imre Deak <imre.deak at intel.com>
Cc: Ankit Nautiyal <ankit.k.nautiyal at intel.com>
Cc: Daniel Vetter <daniel.vetter at ffwll.ch>
Signed-off-by: Bhanuprakash Modem <bhanuprakash.modem at intel.com>
---
 tests/kms_content_protection.c | 41 +++++++++++++---------------------
 1 file changed, 16 insertions(+), 25 deletions(-)

diff --git a/tests/kms_content_protection.c b/tests/kms_content_protection.c
index 5a75b871c..90047029d 100644
--- a/tests/kms_content_protection.c
+++ b/tests/kms_content_protection.c
@@ -452,39 +452,18 @@ static bool sink_hdcp2_capable(igt_output_t *output)
 	return strstr(buf, "HDCP2.2");
 }
 
-static void prepare_modeset_on_mst_output(igt_output_t *output, enum pipe pipe)
+static void prepare_modeset_on_mst_output(igt_output_t *output)
 {
-	drmModeConnectorPtr c = output->config.connector;
 	drmModeModeInfo *mode;
 	igt_plane_t *primary;
-	int i, width, height;
+	int width, height;
+	enum pipe pipe = output->pending_pipe;
 
 	mode = igt_output_get_mode(output);
 
-	/*
-	 * TODO: Add logic to use the highest possible modes on each output.
-	 * Currently using 2k modes by default on all the outputs.
-	 */
-	igt_debug("Before mode override: Output %s Mode hdisplay %d Mode vdisplay %d\n",
-		   output->name, mode->hdisplay, mode->vdisplay);
-
-	if (mode->hdisplay > 1920 && mode->vdisplay > 1080) {
-		for (i = 0; i < c->count_modes; i++) {
-			if (c->modes[i].hdisplay <= 1920 && c->modes[i].vdisplay <= 1080) {
-				mode = &c->modes[i];
-				igt_output_override_mode(output, mode);
-				break;
-			}
-		}
-	}
-
-	igt_debug("After mode overide: Output %s Mode hdisplay %d Mode vdisplay %d\n",
-		   output->name, mode->hdisplay, mode->vdisplay);
-
 	width = mode->hdisplay;
 	height = mode->vdisplay;
 
-	igt_output_set_pipe(output, pipe);
 	primary = igt_output_get_plane_type(output, DRM_PLANE_TYPE_PRIMARY);
 	igt_plane_set_fb(primary, NULL);
 	igt_plane_set_fb(primary, pipe % 2 ? &data.red : &data.green);
@@ -624,7 +603,8 @@ test_content_protection_mst(int content_type)
 
 		igt_assert_f(igt_pipe_connector_valid(pipe, output), "Output-pipe combination invalid\n");
 
-		prepare_modeset_on_mst_output(output, pipe);
+		igt_output_set_pipe(output, pipe);
+		prepare_modeset_on_mst_output(output);
 		mst_output[dp_mst_outputs++] = output;
 
 		pipe++;
@@ -635,6 +615,17 @@ test_content_protection_mst(int content_type)
 
 	igt_require_f(dp_mst_outputs > 1, "No DP MST set up with >= 2 outputs found in a single topology\n");
 
+	if (igt_display_try_commit_atomic(display,
+				DRM_MODE_ATOMIC_TEST_ONLY |
+				DRM_MODE_ATOMIC_ALLOW_MODESET,
+				NULL) != 0) {
+		bool found = override_all_active_output_modes_to_fit_link_bw(display);
+		igt_require_f(found, "No valid mode combo found for MST modeset\n");
+
+		for (count = 0; count < dp_mst_outputs; count++)
+			prepare_modeset_on_mst_output(mst_output[count]);
+	}
+
 	ret = igt_display_try_commit2(display, COMMIT_ATOMIC);
 	igt_require_f(ret == 0, "Commit failure during MST modeset\n");
 
-- 
2.20.1