[PATCH i-g-t 3/5] tests/kms_plane_scaling: Improvise the planes scaling BW issues

[Naladala Ramanaidu <ramanaidu.naladala@intel.com>]

Anticipating bandwidth issues, we expect many tests to fail. To
address these failures, we will switch to the next lower display
mode. Some higher display modes will be identified as insufficient
for downscaling operations on multi-plane scaling. As a solution,
we will implement a fix: when bandwidth is inadequate for current
modes, the test will automatically attempt the next lower
display mode.

v2: Fix some styling issues in the patch (Ankit)
v3: Split single plane and multi plane scaling
    functions arguments in separate patch (Ankit)
v4: Split single plane and multi plane scaling
    functions in separate patch (Ankit)
v5: Add return value to function __test_planes_scaling_combo,
    update test_planes_scaling_combo function, and add
    igt_debug prints.

Signed-off-by: Naladala Ramanaidu <ramanaidu.naladala@intel.com>
---
 tests/kms_plane_scaling.c | 103 ++++++++++++++++++++------------------
 1 file changed, 55 insertions(+), 48 deletions(-)

diff --git a/tests/kms_plane_scaling.c b/tests/kms_plane_scaling.c
index 8a69aacfd..385f02df9 100644
--- a/tests/kms_plane_scaling.c
+++ b/tests/kms_plane_scaling.c
@@ -857,7 +857,7 @@ find_connected_pipe(igt_display_t *display, bool second, igt_output_t **output)
 	return pipe;
 }
 
-static void
+static int
 __test_planes_scaling_combo(data_t *d, int w1, int h1, int w2, int h2,
 			    enum pipe pipe, igt_output_t *output,
 			    igt_plane_t *p1, igt_plane_t *p2,
@@ -899,9 +899,9 @@ __test_planes_scaling_combo(data_t *d, int w1, int h1, int w2, int h2,
 	igt_plane_set_fb(p1, NULL);
 	igt_plane_set_fb(p2, NULL);
 
-	igt_skip_on_f(ret == -EINVAL || ret == -ERANGE,
-		      "Scaling op not supported by driver\n");
-	igt_assert_eq(ret, 0);
+	if (ret == -EINVAL || ret == -ERANGE)
+		igt_debug("Scaling op not supported by driver\n");
+	return ret;
 }
 
 static void setup_fb(int fd, int width, int height, struct igt_fb *fb)
@@ -923,59 +923,66 @@ test_planes_scaling_combo(data_t *d, double sf_plane1,
 	drmModeModeInfo *mode;
 	int n_planes;
 	int w1, h1, w2, h2;
+	int ret;
 
 	cleanup_crtc(d);
 
 	igt_output_set_pipe(output, pipe);
-	mode = igt_output_get_mode(output);
-
-	w1 = get_width(mode, sf_plane1);
-	h1 = get_height(mode, sf_plane1);
-	w2 = get_width(mode, sf_plane2);
-	h2 = get_height(mode, sf_plane2);
-
-	n_planes = display->pipes[pipe].n_planes;
-	igt_require(n_planes >= 2);
-
-	switch (test_type) {
-	case TEST_PLANES_UPSCALE:
-		setup_fb(display->drm_fd, w1, h1, &d->fb[1]);
-		setup_fb(display->drm_fd, w2, h2, &d->fb[2]);
-		break;
-	case TEST_PLANES_DOWNSCALE:
-		setup_fb(display->drm_fd, mode->hdisplay, mode->vdisplay, &d->fb[1]);
-		setup_fb(display->drm_fd, mode->hdisplay, mode->vdisplay, &d->fb[2]);
-		break;
-	case TEST_PLANES_UPSCALE_DOWNSCALE:
-		setup_fb(display->drm_fd, w1, h1, &d->fb[1]);
-		setup_fb(display->drm_fd, mode->hdisplay, mode->vdisplay, &d->fb[2]);
-		break;
-	case TEST_PLANES_DOWNSCALE_UPSCALE:
-		setup_fb(display->drm_fd, mode->hdisplay, mode->vdisplay, &d->fb[1]);
-		setup_fb(display->drm_fd, w2, h2, &d->fb[2]);
-		break;
-	default:
-		igt_assert(0);
-	}
+	for_each_connector_mode(output) {
+		mode = &output->config.connector->modes[j__];
+		igt_output_override_mode(output, mode);
+		igt_debug("Trying mode %dx%d\n",
+			  mode->hdisplay, mode->vdisplay);
+		w1 = get_width(mode, sf_plane1);
+		h1 = get_height(mode, sf_plane1);
+		w2 = get_width(mode, sf_plane2);
+		h2 = get_height(mode, sf_plane2);
+
+		n_planes = display->pipes[pipe].n_planes;
+		igt_require(n_planes >= 2);
+
+		switch (test_type) {
+		case TEST_PLANES_UPSCALE:
+			setup_fb(display->drm_fd, w1, h1, &d->fb[1]);
+			setup_fb(display->drm_fd, w2, h2, &d->fb[2]);
+			break;
+		case TEST_PLANES_DOWNSCALE:
+			setup_fb(display->drm_fd, mode->hdisplay, mode->vdisplay, &d->fb[1]);
+			setup_fb(display->drm_fd, mode->hdisplay, mode->vdisplay, &d->fb[2]);
+			break;
+		case TEST_PLANES_UPSCALE_DOWNSCALE:
+			setup_fb(display->drm_fd, w1, h1, &d->fb[1]);
+			setup_fb(display->drm_fd, mode->hdisplay, mode->vdisplay, &d->fb[2]);
+			break;
+		case TEST_PLANES_DOWNSCALE_UPSCALE:
+			setup_fb(display->drm_fd, mode->hdisplay, mode->vdisplay, &d->fb[1]);
+			setup_fb(display->drm_fd, w2, h2, &d->fb[2]);
+			break;
+		default:
+			igt_assert(0);
+		}
 
-	for (int k = 0; k < n_planes - 1; k += 2) {
-		igt_plane_t *p1, *p2;
+		for (int k = 0; k < n_planes - 1; k += 2) {
+			igt_plane_t *p1, *p2;
 
-		p1 = &display->pipes[pipe].planes[k];
-		igt_require(p1);
-		p2 = &display->pipes[pipe].planes[k+1];
-		igt_require(p2);
+			p1 = &display->pipes[pipe].planes[k];
+			igt_require(p1);
+			p2 = &display->pipes[pipe].planes[k+1];
+			igt_require(p2);
 
-		if (p1->type == DRM_PLANE_TYPE_CURSOR || p2->type == DRM_PLANE_TYPE_CURSOR)
+			if (p1->type == DRM_PLANE_TYPE_CURSOR || p2->type == DRM_PLANE_TYPE_CURSOR)
 				continue;
-
-		__test_planes_scaling_combo(d, w1, h1, w2, h2,
-					    pipe, output, p1, p2,
-					    &d->fb[1], &d->fb[2],
-					    test_type);
+			ret = __test_planes_scaling_combo(d, w1, h1, w2, h2,
+							  pipe, output, p1, p2,
+							  &d->fb[1], &d->fb[2],
+							  test_type);
+			if (ret != 0)
+				break;
+		}
+		cleanup_fbs(d);
 	}
-
-	cleanup_fbs(d);
+	igt_skip_on_f(ret == -EINVAL || ret == -ERANGE,
+		      "Scaling op not supported by driver\n");
 }
 
 static void
-- 
2.43.0