[Intel-gfx] [PATCH v2] kms_atomic : Added subtest for Single Pipe DBUF validation

[meghanelogal]

Existing DDB algorithm divide the DDB wrt data rate,
hence the planes with the less height but same width
will be allocated less blocks and watermark are based
on width which requires more DDB. With this data the flip
may fail.

In new DDB algorithm, the DDB is divided based on
watermark requirement.

In this subtest, dividing the htotal/200 will allocate
~2-4 blocks out of total(512/896), flip may fail with the
exisiting algorithm.But with the new algorithm it will pass.

Signed-off-by: Megha Nelogal <megha.i.nelogal at intel.com>
---
 tests/kms_atomic.c | 82 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 82 insertions(+)

diff --git a/tests/kms_atomic.c b/tests/kms_atomic.c
index f27ee46..bfa4b35 100644
--- a/tests/kms_atomic.c
+++ b/tests/kms_atomic.c
@@ -1280,6 +1280,60 @@ static void atomic_invalid_params(struct kms_atomic_crtc_state *crtc,
 	do_ioctl_err(desc->fd, DRM_IOCTL_MODE_ATOMIC, &ioc, EFAULT);
 }
 
+static void validate_dbuf(struct kms_atomic_crtc_state *crtc,
+				struct kms_atomic_plane_state **plane_array,
+				int plane_count)
+{
+	int i;
+	struct kms_atomic_desc *desc = crtc->state->desc;
+
+	/* for active crtc do modeset on the native resolution */
+	drmModeAtomicReq *req = drmModeAtomicAlloc();
+	struct drm_mode_modeinfo *mode = crtc->mode.data;
+	struct kms_atomic_plane_state plane;
+	struct igt_fb fb;
+
+	crtc_populate_req(crtc, req);
+
+	/* Add plane data to the structure...*/
+	uint32_t crtc_x = 0;
+	uint32_t crtc_y = 0;
+
+	for (i = 0; i < plane_count; i++) {
+		plane = *plane_array[i];
+		uint32_t format = plane_get_igt_format(&plane);
+
+		igt_require(format != 0);
+		plane.src_x = 0;
+		plane.src_y = 0;
+		plane.src_w = (mode->hdisplay / (1)) << 16;
+		plane.crtc_x = crtc_x;
+		plane.crtc_y = crtc_y;
+		plane.crtc_w = (mode->hdisplay) / (1);
+		plane.crtc_h = (mode->vdisplay) / (i + 1);
+
+		plane.crtc_id = crtc->obj;
+
+		if (i%2 == 0) {
+			plane.src_h = (mode->vdisplay / (1)) << 16;
+			plane.crtc_h = (mode->vdisplay) / (1);
+		}
+
+		if (i%2 == 1) {
+			plane.src_h = ceil((mode->vdisplay / 200) << 16);
+			plane.crtc_h = ceil((mode->vdisplay / 200));
+		}
+
+		plane.fb_id = igt_create_fb(plane.state->desc->fd,
+						plane.crtc_w, plane.crtc_h,
+						format, I915_TILING_NONE, &fb);
+		plane_populate_req(&plane, req);
+	}
+	do_atomic_commit(desc->fd, req, ATOMIC_RELAX_NONE);
+	drmModeAtomicFree(req);
+}
+
+
 igt_main
 {
 	struct kms_atomic_desc desc;
@@ -1373,6 +1427,34 @@ igt_main
 		atomic_state_free(scratch);
 	}
 
+	igt_subtest("validate_dbuf") {
+		int gen;
+
+		gen = intel_gen(intel_get_drm_devid(desc.fd));
+		igt_require(gen >= 9);
+
+		struct kms_atomic_state *scratch = atomic_state_dup(current);
+		struct kms_atomic_crtc_state *crtc = find_crtc(scratch, true);
+		struct kms_atomic_plane_state *plane;
+		struct kms_atomic_connector_state *connector =
+				find_connector(scratch, crtc);
+		struct kms_atomic_plane_state **plane_array = NULL;
+		/* Enabling Two planes */
+		plane_array = calloc(2, sizeof(struct kms_atomic_plane_state *));
+		int plane_count = 0;
+
+		igt_require(crtc);
+		plane = find_plane(scratch, PLANE_TYPE_PRIMARY, crtc);
+		igt_require(plane);
+		plane_array[plane_count] = plane; plane_count++;
+		plane = find_plane(scratch, PLANE_TYPE_OVERLAY, crtc);
+		igt_require(plane);
+		plane_array[plane_count] = plane; plane_count++;
+		igt_require(connector);
+		validate_dbuf(crtc, plane_array, plane_count);
+		atomic_state_free(scratch);
+	}
+
 	atomic_state_free(current);
 
 	igt_fixture
-- 
1.9.1