tests/kms_scaling_modes: New IGT to validate scaling modes

In this IGT, various scaling modes are validated. Scaling
mode is one of the connector properties. This property
defines how a non-native mode is upscaled to the native
mode of an LCD panel.

There are 4 types of scaling modes defined:
	None:
		No upscaling happens, scaling is left to the panel. Not all
		drivers expose this mode.
	Full:
		The output is upscaled to the full resolution of the panel,
		ignoring the aspect ratio. It will expand current image to
		the size of the monitor.
	Center:
		No upscaling happens, the output is centered within the native
		resolution the panel. As a result, black bars may appear
		around the image.
	Full aspect:
		The output is upscaled to maximize either the width or height
		while retaining the aspect ratio. It will fill the screen w/o
		stretching the image. Black bars are placed either on top
		and bottom or left and right of the picture.

v2: -removed test flags/test_cycle_flags() (JP)
    -removed redundant igt_display_commit_atomic() (JP)
    -corrected indentation (JP)
v3: -removed valid_test check, getting covered in
     igt_subtest_with_dynamic() (Bhanu)
    -removed redundant if statement, moved remove_fb()
     before skip (JP)
v4: -Removed unnecessary headers (JP)
    -Corrected usage of igt_dynamic_f() (Bhanu)

Signed-off-by: Swati Sharma <swati2.sharma@intel.com>
Reviewed-by: Juha-Pekka Heikkila <juhapekka.heikkila@gmail.com>
Reviewed-by: Bhanuprakash Modem <bhanuprakash.modem@intel.com>

1 files changed, 137 insertions, 0 deletions

diff --git a/tests/kms_scaling_modes.c b/tests/kms_scaling_modes.c
new file mode 100644
index 00000000..8e80189a
--- /dev/null
+++ b/tests/kms_scaling_modes.c
@@ -0,0 +1,137 @@
+/*
+ * Copyright © 2022 Intel Corporation
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
+ * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
+ * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ *
+ * Author:
+ *     Swati Sharma <swati2.sharma@intel.com>
+ */
+
+#include "igt.h"
+
+IGT_TEST_DESCRIPTION("Test display scaling modes");
+
+/* Common test data */
+typedef struct data {
+	igt_display_t display;
+	int drm_fd;
+} data_t;
+
+static void test_scaling_mode_on_output(igt_display_t *display, const enum pipe pipe,
+					igt_output_t *output, uint32_t flags)
+{
+	igt_plane_t *primary, *sprite;
+	drmModeModeInfo mode;
+	struct igt_fb red, blue;
+	int ret;
+
+	igt_output_set_pipe(output, pipe);
+	mode = *igt_output_get_mode(output);
+
+	primary = igt_output_get_plane_type(output, DRM_PLANE_TYPE_PRIMARY);
+	sprite = igt_output_get_plane_type(output, DRM_PLANE_TYPE_OVERLAY);
+
+	igt_create_color_fb(display->drm_fd, mode.hdisplay, mode.vdisplay,
+			    DRM_FORMAT_XRGB8888, DRM_FORMAT_MOD_NONE,
+			    0.f, 0.f, 1.f, &blue);
+
+	igt_create_color_fb(display->drm_fd, 640, 480,
+			    DRM_FORMAT_XRGB8888, DRM_FORMAT_MOD_NONE,
+			    1.f, 0.f, 0.f, &red);
+
+	igt_plane_set_fb(primary, &blue);
+	igt_plane_set_fb(sprite, &red);
+
+	igt_display_try_commit_atomic(display, DRM_MODE_ATOMIC_ALLOW_MODESET, NULL);
+
+	mode.hdisplay = 640;
+	mode.vdisplay = 480;
+	igt_output_override_mode(output, &mode);
+
+	igt_plane_set_fb(sprite, NULL);
+	igt_plane_set_fb(primary, &red);
+
+	igt_output_set_prop_value(output, IGT_CONNECTOR_SCALING_MODE, flags);
+
+	/* Don't pass ALLOW_MODESET with overridden mode, force fastset */
+	ret = igt_display_try_commit_atomic(display, 0, NULL);
+
+	igt_remove_fb(display->drm_fd, &red);
+	igt_remove_fb(display->drm_fd, &blue);
+
+	igt_skip_on_f(ret == -EINVAL, "Scaling mode not supported\n");
+}
+
+/* Returns true if an output supports scaling mode property */
+static bool has_scaling_mode(igt_output_t *output)
+{
+	return igt_output_has_prop(output, IGT_CONNECTOR_SCALING_MODE) &&
+	       igt_output_get_prop(output, IGT_CONNECTOR_SCALING_MODE);
+}
+
+static void test_scaling_mode(data_t *data, uint32_t flags)
+{
+	igt_display_t *display = &data->display;
+	igt_output_t *output;
+	enum pipe pipe;
+
+	for_each_pipe_with_valid_output(display, pipe, output) {
+		if (!has_scaling_mode(output))
+			continue;
+
+		igt_dynamic_f("%s-pipe-%s", output->name, kmstest_pipe_name(pipe))
+			test_scaling_mode_on_output(display, pipe, output, flags);
+
+		igt_display_reset(display);
+	}
+}
+
+igt_main
+{
+	data_t data = {};
+
+	igt_fixture {
+		data.drm_fd = drm_open_driver_master(DRIVER_ANY);
+		igt_require(data.drm_fd >= 0);
+
+		kmstest_set_vt_graphics_mode();
+
+		igt_display_require(&data.display, data.drm_fd);
+		igt_require(data.display.is_atomic);
+
+		igt_display_require_output(&data.display);
+	}
+
+	igt_describe("Tests full display scaling mode");
+	igt_subtest_with_dynamic("scaling-mode-full")
+		test_scaling_mode(&data, DRM_MODE_SCALE_FULLSCREEN);
+	igt_describe("Tests center display scaling mode");
+	igt_subtest_with_dynamic("scaling-mode-center")
+		test_scaling_mode(&data, DRM_MODE_SCALE_CENTER);
+	igt_describe("Tests full aspect display scaling mode");
+	igt_subtest_with_dynamic("scaling-mode-full-aspect")
+		test_scaling_mode(&data, DRM_MODE_SCALE_ASPECT);
+	igt_describe("Tests none display scaling mode (no scaling)");
+	igt_subtest_with_dynamic("scaling-mode-none")
+		test_scaling_mode(&data, DRM_MODE_SCALE_NONE);
+
+	igt_fixture
+		igt_display_fini(&data.display);
+}