[PATCH 5/7] drm/selftests: Add some selftests for drm_atomic_set_mode_for_crtc()

[Ville Syrjala]

From: Ville Syrjälä <ville.syrjala at linux.intel.com>

Test the basics of drm_atomic_set_mode_for_crtc(), and in particular
verify that the function doesn't take the shortcut incorrectly.

Cc: Daniel Vetter <daniel at ffwll.ch>
Signed-off-by: Ville Syrjälä <ville.syrjala at linux.intel.com>
---
 drivers/gpu/drm/selftests/Makefile            |   3 +-
 .../gpu/drm/selftests/drm_modeset_selftests.h |   2 +
 .../gpu/drm/selftests/test-drm_atomic_uapi.c  | 110 ++++++++++++++++++
 .../drm/selftests/test-drm_modeset_common.h   |   2 +
 4 files changed, 116 insertions(+), 1 deletion(-)
 create mode 100644 drivers/gpu/drm/selftests/test-drm_atomic_uapi.c

diff --git a/drivers/gpu/drm/selftests/Makefile b/drivers/gpu/drm/selftests/Makefile
index d2137342b371..a5adc25bd345 100644
--- a/drivers/gpu/drm/selftests/Makefile
+++ b/drivers/gpu/drm/selftests/Makefile
@@ -1,6 +1,7 @@
 # SPDX-License-Identifier: GPL-2.0-only
 test-drm_modeset-y := test-drm_modeset_common.o test-drm_plane_helper.o \
                       test-drm_format.o test-drm_framebuffer.o \
-		      test-drm_damage_helper.o test-drm_dp_mst_helper.o
+		      test-drm_damage_helper.o test-drm_dp_mst_helper.o \
+		      test-drm_atomic_uapi.o
 
 obj-$(CONFIG_DRM_DEBUG_SELFTEST) += test-drm_mm.o test-drm_modeset.o test-drm_cmdline_parser.o
diff --git a/drivers/gpu/drm/selftests/drm_modeset_selftests.h b/drivers/gpu/drm/selftests/drm_modeset_selftests.h
index 1898de0b4a4d..2cc4e2f43286 100644
--- a/drivers/gpu/drm/selftests/drm_modeset_selftests.h
+++ b/drivers/gpu/drm/selftests/drm_modeset_selftests.h
@@ -6,6 +6,8 @@
  *
  * Tests are executed in order by igt/drm_selftests_helper
  */
+selftest(atomic_set_mode_for_crtc, igt_atomic_set_mode_for_crtc)
+selftest(atomic_set_zeroed_mode_for_crtc, igt_atomic_set_zeroed_mode_for_crtc)
 selftest(check_plane_state, igt_check_plane_state)
 selftest(check_drm_format_block_width, igt_check_drm_format_block_width)
 selftest(check_drm_format_block_height, igt_check_drm_format_block_height)
diff --git a/drivers/gpu/drm/selftests/test-drm_atomic_uapi.c b/drivers/gpu/drm/selftests/test-drm_atomic_uapi.c
new file mode 100644
index 000000000000..0f9a4d0d2541
--- /dev/null
+++ b/drivers/gpu/drm/selftests/test-drm_atomic_uapi.c
@@ -0,0 +1,110 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Test cases for the drm_atomic_uapi functions
+ */
+
+#define pr_fmt(fmt) "drm_atomic_uapi: " fmt
+
+#include <drm/drm_atomic_uapi.h>
+#include <drm/drm_drv.h>
+#include <drm/drm_crtc.h>
+#include <drm/drm_modes.h>
+
+#include "test-drm_modeset_common.h"
+
+static const struct drm_display_mode zeroed_mode;
+
+static struct drm_driver mock_driver;
+static struct drm_device mock_device;
+static struct drm_crtc mock_crtc;
+
+static void init(void)
+{
+	memset(&mock_driver, 0, sizeof(mock_driver));
+	memset(&mock_device, 0, sizeof(mock_device));
+	memset(&mock_crtc, 0, sizeof(mock_crtc));
+
+	mock_device.driver = &mock_driver;
+	mock_crtc.dev = &mock_device;
+
+	drm_mode_config_init(&mock_device);
+}
+
+static void cleanup(void)
+{
+	drm_mode_config_cleanup(&mock_device);
+}
+
+int igt_atomic_set_mode_for_crtc(void *ignored)
+{
+	static const struct drm_display_mode mode1 = {
+		DRM_MODE("640x480", DRM_MODE_TYPE_DRIVER, 25175,
+			 640, 656, 752, 800, 0, 480, 490, 492, 525, 0,
+			 DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_NVSYNC)
+	};
+	static const struct drm_display_mode mode2 = {
+		DRM_MODE("1024x768", DRM_MODE_TYPE_DRIVER, 65000,
+			 1024, 1048, 1184, 1344, 0, 768, 771, 777, 806, 0,
+			 DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_NVSYNC)
+	};
+	struct drm_crtc_state crtc_state = {
+		.crtc = &mock_crtc,
+	};
+	int ret;
+
+	init();
+
+	/*
+	 * Make	sure drm_atomic_set_mode_for_crtc()
+	 * updates the crtc state correctly.
+	 */
+	ret = drm_atomic_set_mode_for_crtc(&crtc_state, &mode1);
+	FAIL(ret < 0, "Unable to set mode on crtc\n");
+	FAIL_ON(!crtc_state.enable);
+	FAIL_ON(memcmp(&crtc_state.mode, &mode1, sizeof(mode1)));
+
+	ret = drm_atomic_set_mode_for_crtc(&crtc_state, &mode2);
+	FAIL(ret < 0, "Unable to set mode on crtc\n");
+	FAIL_ON(!crtc_state.enable);
+	FAIL_ON(memcmp(&crtc_state.mode, &mode2, sizeof(mode2)));
+
+	ret = drm_atomic_set_mode_for_crtc(&crtc_state, NULL);
+	FAIL(ret < 0, "Unable to unset mode on crtc\n");
+	FAIL_ON(crtc_state.enable);
+	FAIL_ON(memcmp(&crtc_state.mode, &zeroed_mode, sizeof(zeroed_mode)));
+
+	cleanup();
+
+	return 0;
+}
+
+int igt_atomic_set_zeroed_mode_for_crtc(void *ignored)
+{
+	struct drm_crtc_state crtc_state = {
+		.crtc = &mock_crtc,
+	};
+	int ret;
+
+	init();
+
+	/*
+	 * Make sure drm_atomic_set_mode_for_crtc() doesn't
+	 * take the shortcut and fail to update crtc_state.enable
+	 * when passed a zeroed mode (which is technically not
+	 * valid, but as drm_atomic_set_mode_for_crtc() does no
+	 * mode validation it should still work).
+	 */
+	ret = drm_atomic_set_mode_for_crtc(&crtc_state, &zeroed_mode);
+	FAIL(ret < 0, "Unable to set mode on crtc\n");
+	FAIL_ON(!crtc_state.enable);
+	FAIL_ON(memcmp(&crtc_state.mode, &zeroed_mode, sizeof(zeroed_mode)));
+
+	ret = drm_atomic_set_mode_for_crtc(&crtc_state, NULL);
+	FAIL(ret < 0, "Unable to unset mode on crtc\n");
+	FAIL_ON(crtc_state.enable);
+	FAIL_ON(memcmp(&crtc_state.mode, &zeroed_mode, sizeof(zeroed_mode)));
+
+	cleanup();
+
+	return 0;
+}
diff --git a/drivers/gpu/drm/selftests/test-drm_modeset_common.h b/drivers/gpu/drm/selftests/test-drm_modeset_common.h
index 0fcb8bbc6a1b..a1248abf86f9 100644
--- a/drivers/gpu/drm/selftests/test-drm_modeset_common.h
+++ b/drivers/gpu/drm/selftests/test-drm_modeset_common.h
@@ -13,6 +13,8 @@
 
 #define FAIL_ON(x) FAIL((x), "%s", "FAIL_ON(" __stringify(x) ")\n")
 
+int igt_atomic_set_mode_for_crtc(void *ignored);
+int igt_atomic_set_zeroed_mode_for_crtc(void *ignored);
 int igt_check_plane_state(void *ignored);
 int igt_check_drm_format_block_width(void *ignored);
 int igt_check_drm_format_block_height(void *ignored);
-- 
2.23.0