[PATCH i-g-t v6 4/5] tests/kms_plane_scaling: Find display mode fitting in BW for rotations

[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 plane scaling. As a solution, we
will implement a fix: When bandwidth is inadequate for current
modes, the system will automatically attempt the next lower
display mode.

Example for failure:
[drm:intel_compute_min_cdclk [xe]] required cdclk (1066500 kHz)
exceeds max (652800 kHz)

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: Update check_scaling_pipe_plane_rot to handle
    scaling mode failure by trying next lower mode
v6: Update commit subject/message and add driver return value
    in igt_debug and igt_skip print   (kamil)

Signed-off-by: Naladala Ramanaidu <ramanaidu.naladala@intel.com>
---
 tests/kms_plane_scaling.c | 101 +++++++++++++++++++++-----------------
 1 file changed, 55 insertions(+), 46 deletions(-)

diff --git a/tests/kms_plane_scaling.c b/tests/kms_plane_scaling.c
index 2c4490fd3..6cd7ed35d 100644
--- a/tests/kms_plane_scaling.c
+++ b/tests/kms_plane_scaling.c
@@ -582,55 +582,64 @@ static void check_scaling_pipe_plane_rot(data_t *d, igt_plane_t *plane,
 	int w, h;
 	int width, height;
 
-	mode = igt_output_get_mode(output);
-	if (is_clip_clamp == true) {
-		width = mode->hdisplay + 100;
-		height = mode->vdisplay + 100;
-	} else {
-		width = get_width(mode, sf_plane);
-		height = get_height(mode, sf_plane);
-	}
+	for_each_connector_mode(output) {
+		mode = &output->config.connector->modes[j__];
+		igt_debug("Trying mode %dx%d\n",
+				mode->hdisplay, mode->vdisplay);
+		if (is_clip_clamp == true) {
+			width = mode->hdisplay + 100;
+			height = mode->vdisplay + 100;
+		} else {
+			width = get_width(mode, sf_plane);
+			height = get_height(mode, sf_plane);
+		}
 
-	if (is_upscale) {
-		w = width;
-		h = height;
-	} else {
-		w = mode->hdisplay;
-		h = mode->vdisplay;
+		if (is_upscale) {
+			w = width;
+			h = height;
+		} else {
+			w = mode->hdisplay;
+			h = mode->vdisplay;
+		}
+		/*
+		 * guarantee even value width/height to avoid fractional
+		 * uv component in chroma subsampling for yuv 4:2:0 formats
+		 */
+		w = ALIGN(w, 2);
+		h = ALIGN(h, 2);
+
+		igt_create_fb(display->drm_fd, w, h, pixel_format,
+			      modifier, &d->fb[0]);
+
+		igt_plane_set_fb(plane, &d->fb[0]);
+		igt_fb_set_position(&d->fb[0], plane, 0, 0);
+		igt_fb_set_size(&d->fb[0], plane, w, h);
+		igt_plane_set_position(plane, 0, 0);
+		commit_ret = igt_display_try_commit2(display, COMMIT_ATOMIC);
+		igt_skip_on_f(commit_ret == -ERANGE || commit_ret == -EINVAL,
+			      "Mode fail with  %dx%d\n", w, h);
+
+		if (is_upscale)
+			igt_plane_set_size(plane, mode->hdisplay, mode->vdisplay);
+		else
+			igt_plane_set_size(plane, width, height);
+
+		if (rot != IGT_ROTATION_0)
+			igt_plane_set_rotation(plane, rot);
+		commit_ret = igt_display_try_commit2(display, COMMIT_ATOMIC);
+		if (commit_ret == -ERANGE || commit_ret == -EINVAL)
+			igt_debug("Unsupported scaling factor with fb size %dx%d "
+				  "with return value %s\n",
+				   w, h, (commit_ret == -EINVAL) ? "-EINVAL" : "-ERANGE");
+		igt_plane_set_fb(plane, NULL);
+		igt_plane_set_position(plane, 0, 0);
+		cleanup_fbs(d);
+		if (commit_ret == 0)
+			break;
 	}
-
-	/*
-	 * guarantee even value width/height to avoid fractional
-	 * uv component in chroma subsampling for yuv 4:2:0 formats
-	 * */
-	w = ALIGN(w, 2);
-	h = ALIGN(h, 2);
-
-	igt_create_fb(display->drm_fd, w, h, pixel_format, modifier, &d->fb[0]);
-
-	igt_plane_set_fb(plane, &d->fb[0]);
-	igt_fb_set_position(&d->fb[0], plane, 0, 0);
-	igt_fb_set_size(&d->fb[0], plane, w, h);
-	igt_plane_set_position(plane, 0, 0);
-	commit_ret = igt_display_try_commit2(display, COMMIT_ATOMIC);
-	igt_skip_on_f(commit_ret == -ERANGE || commit_ret == -EINVAL,
-		      "Mode fail with  %dx%d\n", w, h);
-	if (is_upscale)
-		igt_plane_set_size(plane, mode->hdisplay, mode->vdisplay);
-	else
-		igt_plane_set_size(plane, width, height);
-
-	if (rot != IGT_ROTATION_0)
-		igt_plane_set_rotation(plane, rot);
-	commit_ret = igt_display_try_commit2(display, COMMIT_ATOMIC);
-
-	igt_plane_set_fb(plane, NULL);
-	igt_plane_set_position(plane, 0, 0);
-	cleanup_fbs(d);
-
 	igt_skip_on_f(commit_ret == -ERANGE || commit_ret == -EINVAL,
-		      "Unsupported scaling factor with fb size %dx%d\n",
-		      w, h);
+		      "Unsupported scaling operation in driver with return value %s\n",
+		      (commit_ret == -EINVAL) ? "-EINVAL" : "-ERANGE");
 	igt_assert_eq(commit_ret, 0);
 }
 
-- 
2.43.0