[igt-dev] [v2 i-g-t 3/5] tests/kms_cursor_legacy: 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.

V2:
* Remove MST specific logic (Daniel)

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_cursor_legacy.c | 47 ++++++++++++++++++++++++++++++++++++---
 1 file changed, 44 insertions(+), 3 deletions(-)

diff --git a/tests/kms_cursor_legacy.c b/tests/kms_cursor_legacy.c
index 4723e1ff9..afa67e2c0 100644
--- a/tests/kms_cursor_legacy.c
+++ b/tests/kms_cursor_legacy.c
@@ -50,6 +50,15 @@ IGT_TEST_DESCRIPTION("Stress legacy cursor ioctl");
 
 igt_pipe_crc_t *pipe_crc;
 
+static void override_output_modes(igt_display_t *display, igt_output_t *output, igt_output_t *output2)
+{
+	bool found = override_all_active_output_modes_to_fit_link_bw(display);
+	igt_require_f(found, "No valid mode combo found.\n");
+
+	igt_output_set_pipe(output, PIPE_NONE);
+	igt_output_set_pipe(output2, PIPE_NONE);
+}
+
 static void stress(igt_display_t *display,
 		   enum pipe pipe, int num_children, unsigned mode,
 		   int timeout)
@@ -393,6 +402,7 @@ static void flip(igt_display_t *display,
 	struct drm_mode_cursor arg[2];
 	uint64_t *results;
 	struct igt_fb fb_info, fb_info2, argb_fb, cursor_fb, cursor_fb2;
+	igt_output_t *output, *output2;
 
 	results = mmap(NULL, PAGE_SIZE, PROT_WRITE, MAP_SHARED | MAP_ANON, -1, 0);
 	igt_assert(results != MAP_FAILED);
@@ -406,9 +416,20 @@ static void flip(igt_display_t *display,
 	if (mode >= flip_test_atomic)
 		igt_require(display->is_atomic);
 
-	igt_require(set_fb_on_crtc(display, flip_pipe, &fb_info));
-	if (flip_pipe != cursor_pipe)
-		igt_require(set_fb_on_crtc(display, cursor_pipe, &fb_info2));
+	igt_require((output = set_fb_on_crtc(display, flip_pipe, &fb_info)));
+	if (flip_pipe != cursor_pipe) {
+		igt_require((output2 = set_fb_on_crtc(display, cursor_pipe, &fb_info2)));
+
+		if (igt_display_try_commit_atomic(display,
+					  DRM_MODE_ATOMIC_TEST_ONLY |
+					  DRM_MODE_ATOMIC_ALLOW_MODESET,
+					  NULL) != 0) {
+			override_output_modes(display, output, output2);
+
+			igt_require((output = set_fb_on_crtc(display, flip_pipe, &fb_info)));
+			igt_require((output2 = set_fb_on_crtc(display, cursor_pipe, &fb_info2)));
+		}
+	}
 
 	igt_create_color_fb(display->drm_fd, fb_info.width, fb_info.height, DRM_FORMAT_ARGB8888, 0, .5, .5, .5, &cursor_fb);
 
@@ -879,6 +900,16 @@ static void two_screens_flip_vs_cursor(igt_display_t *display, int nloops, bool
 	igt_require((output = set_fb_on_crtc(display, pipe, &fb_info)));
 	igt_require((output2 = set_fb_on_crtc(display, pipe2, &fb2_info)));
 
+	if (igt_display_try_commit_atomic(display,
+					  DRM_MODE_ATOMIC_TEST_ONLY |
+					  DRM_MODE_ATOMIC_ALLOW_MODESET,
+					  NULL) != 0) {
+		override_output_modes(display, output, output2);
+
+		igt_require((output = set_fb_on_crtc(display, pipe, &fb_info)));
+		igt_require((output2 = set_fb_on_crtc(display, pipe2, &fb2_info)));
+	}
+
 	igt_create_color_fb(display->drm_fd, 64, 64, DRM_FORMAT_ARGB8888, 0, 1., 1., 1., &cursor_fb);
 	set_cursor_on_pipe(display, pipe, &cursor_fb);
 	populate_cursor_args(display, pipe, arg1, &cursor_fb);
@@ -1129,6 +1160,16 @@ static void two_screens_cursor_vs_flip(igt_display_t *display, int nloops, bool
 	igt_require((outputs[0] = set_fb_on_crtc(display, pipe[0], &fb_info[0])));
 	igt_require((outputs[1] = set_fb_on_crtc(display, pipe[1], &fb_info[1])));
 
+	if (igt_display_try_commit_atomic(display,
+					  DRM_MODE_ATOMIC_TEST_ONLY |
+					  DRM_MODE_ATOMIC_ALLOW_MODESET,
+					  NULL) != 0) {
+		override_output_modes(display, outputs[0], outputs[1]);
+
+		igt_require((outputs[0] = set_fb_on_crtc(display, pipe[0], &fb_info[0])));
+		igt_require((outputs[1] = set_fb_on_crtc(display, pipe[1], &fb_info[1])));
+	}
+
 	igt_create_color_fb(display->drm_fd, 64, 64, DRM_FORMAT_ARGB8888, 0, 1., 1., 1., &cursor_fb);
 
 	set_cursor_on_pipe(display, pipe[0], &cursor_fb);
-- 
2.20.1