tests/kms_plane_scaling: Add negative test to check num of scalers

To validate i915 supports max of 2 scalers, applied upscaling on
3 planes simultaneously. This is a negative test and commit is expected
to fail.

v2: -add check for min 2 scalers
    -add igt_require() for overlay planes, fixes CRASH on KBL
v3: -rebase
v4: -add check for non-i915 devices (Petri)

Signed-off-by: Swati Sharma <swati2.sharma@intel.com>
Reviewed-by: Petri Latvala <petri.latvala@intel.com>

1 files changed, 74 insertions, 0 deletions

diff --git a/tests/kms_plane_scaling.c b/tests/kms_plane_scaling.c
index 243a692d..b91039b0 100644
--- a/tests/kms_plane_scaling.c
+++ b/tests/kms_plane_scaling.c
@@ -503,6 +503,72 @@ test_planes_scaling_combo(data_t *d, int w1, int h1, int w2, int h2,
 	igt_remove_fb(display->drm_fd, &d->fb[2]);
 }
 
+static void
+test_invalid_num_scalers(data_t *d, enum pipe pipe, igt_output_t *output)
+{
+	igt_display_t *display = &d->display;
+	igt_pipe_t *pipe_obj = &display->pipes[pipe];
+	int width, height;
+	igt_plane_t *plane[3];
+	drmModeModeInfo *mode;
+	int ret;
+
+	cleanup_crtc(d);
+
+	igt_output_set_pipe(output, pipe);
+
+	width = height = 20;
+	mode = igt_output_get_mode(output);
+
+	plane[0] = igt_pipe_get_plane_type_index(pipe_obj, DRM_PLANE_TYPE_OVERLAY, 0);
+	igt_require(plane[0]);
+	plane[1] = igt_pipe_get_plane_type_index(pipe_obj, DRM_PLANE_TYPE_OVERLAY, 1);
+	igt_require(plane[1]);
+	plane[2] = igt_pipe_get_plane_type_index(pipe_obj, DRM_PLANE_TYPE_OVERLAY, 2);
+	igt_require(plane[2]);
+
+	igt_create_color_pattern_fb(display->drm_fd,
+                                    width, height,
+                                    DRM_FORMAT_XRGB8888,
+                                    I915_TILING_NONE,
+                                    1.0, 0.0, 0.0, &d->fb[0]);
+	igt_create_color_pattern_fb(display->drm_fd,
+                                    width, height,
+                                    DRM_FORMAT_XRGB8888,
+                                    I915_TILING_NONE,
+                                    0.0, 1.0, 0.0, &d->fb[1]);
+	igt_create_color_pattern_fb(display->drm_fd,
+                                    width, height,
+                                    DRM_FORMAT_XRGB8888,
+                                    I915_TILING_NONE,
+                                    0.0, 0.0, 1.0, &d->fb[2]);
+
+	igt_plane_set_fb(plane[0], &d->fb[0]);
+	igt_plane_set_fb(plane[1], &d->fb[1]);
+	igt_plane_set_fb(plane[2], &d->fb[2]);
+
+	igt_plane_set_size(plane[0], mode->hdisplay, mode->vdisplay);
+	igt_plane_set_size(plane[1], mode->hdisplay, mode->vdisplay);
+	igt_plane_set_size(plane[2], mode->hdisplay, mode->vdisplay);
+
+	/* This commit is expected to fail for i915 devices. i915 devices support
+	 * max 2 scalers/pipe. In dmesg we can find: Too many scaling requests 3 > 2.
+	 * For devices (non-i915, or possible future i915) that are able to perform this
+	 * amount of scaling; handle that case aswell.
+	 * */
+	ret = igt_display_try_commit_atomic(display, DRM_MODE_ATOMIC_ALLOW_MODESET, NULL);
+	igt_skip_on_f(ret == 0, "Cannot test handling of too many scaling ops, the device supports a large amount.\n");
+	igt_assert_eq(ret, -EINVAL);
+
+	/* cleanup */
+	igt_plane_set_fb(plane[0], NULL);
+	igt_plane_set_fb(plane[1], NULL);
+	igt_plane_set_fb(plane[2], NULL);
+	igt_remove_fb(display->drm_fd, &d->fb[0]);
+	igt_remove_fb(display->drm_fd, &d->fb[1]);
+	igt_remove_fb(display->drm_fd, &d->fb[2]);
+}
+
 static void test_scaler_with_multi_pipe_plane(data_t *d)
 {
 	igt_display_t *display = &d->display;
@@ -879,6 +945,14 @@ igt_main_args("", long_opts, help_str, opt_handler, &data)
 				}
 			}
 		}
+
+		igt_describe("Negative test for number of scalers per pipe.");
+		igt_subtest_with_dynamic("invalid-num-scalers") {
+			for_each_pipe_with_valid_output(&data.display, pipe, output)
+				igt_dynamic_f("pipe-%s-%s-invalid-num-scalers",
+					       kmstest_pipe_name(pipe), igt_output_name(output))
+					test_invalid_num_scalers(&data, pipe, output);
+		}
 	}
 
 	igt_describe("Tests scaling with multi-pipe scenario.");