[PATCH i-g-t] tests/kms_flip: add flip-32bpp-to-64bpp-downscaled-fb subtest

[Juha-Pekka Heikkila]

attempt to cause cdclk changes during flipping by flipping from
32bpp fb to downscaled 64bpp fb. Both images are green color
and verified to match with crc.

Signed-off-by: Juha-Pekka Heikkila <juhapekka.heikkila at gmail.com>
---
 tests/kms_flip.c | 83 ++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 83 insertions(+)

diff --git a/tests/kms_flip.c b/tests/kms_flip.c
index b33cfe9c..0cc33ec3 100755
--- a/tests/kms_flip.c
+++ b/tests/kms_flip.c
@@ -1605,6 +1605,84 @@ static void test_nonblocking_read(int in)
 	close(fd);
 }
 
+static void test_flip_to_scaled(void)
+{
+	drmModeModeInfo *mode;
+	uint32_t screenwidth, screenheight;
+	uint32_t bigfbwidth, bigfbheight;
+	igt_display_t display;
+	uint32_t pipe = 0;	//lets just run on first output, first pipe
+	uint64_t modifier = LOCAL_I915_FORMAT_MOD_Y_TILED;
+	uint32_t smallformat = DRM_FORMAT_XRGB8888, bigformat = DRM_FORMAT_XRGB16161616F;
+	igt_output_t *output;
+	igt_plane_t *primary;
+	igt_pipe_crc_t *pipe_crc;
+	igt_crc_t small_crc, big_crc;
+	struct drm_event_vblank ev;
+	struct igt_fb small_fb, big_fb;
+
+	igt_require_pipe_crc(drm_fd);
+	igt_display_require(&display, drm_fd);
+	igt_require(display.is_atomic);
+	igt_require(igt_display_has_format_mod(&display, smallformat, modifier));
+	igt_require(igt_display_has_format_mod(&display, bigformat, modifier));
+
+	for_each_connected_output(&display, output) {
+		mode = igt_output_get_mode(output);
+		screenheight = min(mode->vdisplay, 1080);
+		screenwidth = min(mode->hdisplay, 1920);
+
+		// big fb will be 4k
+		bigfbwidth = 1920*2;
+		bigfbheight = 1080*2;
+
+		igt_require(igt_create_color_fb(drm_fd, screenwidth, screenheight,
+				smallformat, modifier,
+				0, 1, 0, &small_fb));
+
+		igt_require(igt_create_color_fb(drm_fd, bigfbwidth, bigfbheight,
+				bigformat, modifier,
+				0, 1, 0, &big_fb));
+
+		igt_output_set_pipe(output, pipe);
+
+		primary = igt_output_get_plane_type(output, DRM_PLANE_TYPE_PRIMARY);
+		igt_plane_set_fb(primary, NULL);
+
+		igt_display_commit_atomic(&display, DRM_MODE_ATOMIC_ALLOW_MODESET, NULL);
+		pipe_crc = igt_pipe_crc_new(drm_fd, pipe, INTEL_PIPE_CRC_SOURCE_AUTO);
+		igt_pipe_crc_start(pipe_crc);
+
+		igt_plane_set_position(primary, 0, 0);
+		igt_plane_set_fb(primary, &small_fb);
+		igt_plane_set_size(primary, screenwidth, screenheight);
+
+		igt_display_commit_atomic(&display, DRM_MODE_ATOMIC_ALLOW_MODESET, NULL);
+		igt_pipe_crc_collect_crc(pipe_crc, &small_crc);
+
+		igt_plane_set_fb(primary, &big_fb);
+		igt_plane_set_size(primary, screenwidth, screenheight);
+		igt_display_commit_atomic(&display, DRM_MODE_ATOMIC_ALLOW_MODESET  |
+							DRM_MODE_PAGE_FLIP_EVENT, NULL);
+
+		igt_assert(read(drm_fd, &ev, sizeof(ev)) == sizeof(ev));
+
+		igt_pipe_crc_collect_crc(pipe_crc, &big_crc);
+
+		igt_pipe_crc_stop(pipe_crc);
+		igt_pipe_crc_free(pipe_crc);
+		igt_remove_fb(drm_fd, &small_fb);
+		igt_remove_fb(drm_fd, &big_fb);
+		igt_output_set_pipe(output, PIPE_ANY);
+
+		igt_assert_crc_equal(&small_crc, &big_crc);
+
+		// run just on first found connected output.
+		break;
+	}
+}
+
+
 igt_main
 {
 	struct {
@@ -1720,4 +1798,9 @@ igt_main
 			run_pair(tests[i].duration, tests[i].flags);
 	}
 	igt_stop_signal_helper();
+
+	igt_describe("try to flip from 32bpp non scaled fb to 64bpp downscaled fb"
+		     "in attempt to stress cdclk reprogramming.");
+	igt_subtest("flip-32bpp-to-64bpp-downscaled-fb")
+		test_flip_to_scaled();
 }
-- 
2.26.0