[igt-dev] [PATCH v2] tests/kms_pipe_crc_basic: Sanity check for CRC mismatches

[Bhanuprakash Modem]

We’ve seen multiple CRC related issues on older platforms and
pre-silicon environment, most of the time we end up with debugging.

This patch works as a crc-sanity test, which can verify that the
CRC mechanism is clean from the platform side before debugging the
actual CRC mismatches or other CRC related issues.

This patch will create two framebuffers (fb0 & fb1) with the same
color info, flip fb0 with primary plane & collect CRC as reference.
Then flip fb1 with primary plane, collect the CRC and compare with
the reference CRC. There should be no CRC mismatch.

v2:
* Run subtest to all pipes (Karthik & Swati)
* Fix commit message & few comments (Karthik)
* Use meaningful name for functions (Swati)
* Remove unwanted checks (Karthik)

Cc: Swati Sharma <swati2.sharma at intel.com>
Cc: Karthik B S <karthik.b.s at intel.com>
Cc: Jeevan B <jeevan.b at intel.com>
Cc: Petri Latvala <petri.latvala at intel.com>
Cc: Arkadiusz Hiler <arkadiusz.hiler at intel.com>
Signed-off-by: Bhanuprakash Modem <bhanuprakash.modem at intel.com>
---
 tests/kms_pipe_crc_basic.c | 73 ++++++++++++++++++++++++++++++++++++++
 1 file changed, 73 insertions(+)

diff --git a/tests/kms_pipe_crc_basic.c b/tests/kms_pipe_crc_basic.c
index cb93c1ad..599047cb 100644
--- a/tests/kms_pipe_crc_basic.c
+++ b/tests/kms_pipe_crc_basic.c
@@ -154,6 +154,75 @@ static void test_read_crc(data_t *data, enum pipe pipe, unsigned flags)
 	}
 }
 
+/*
+ * CRC-sanity test, to make sure there would be no CRC mismatches
+ *
+ * - Create two framebuffers (FB0 & FB1) with same color info
+ * - Flip FB0 with the Primary plane & collect the CRC as ref CRC.
+ * - Flip FB1 with the Primary plane, collect the CRC & compare with
+ *   the ref CRC.
+ *
+ *   No CRC mismatch should happen
+ */
+static void test_compare_crc(data_t *data, enum pipe pipe)
+{
+	igt_display_t *display = &data->display;
+	igt_plane_t *primary;
+	drmModeModeInfo *mode;
+	igt_crc_t ref_crc, crc;
+	igt_pipe_crc_t *pipe_crc = NULL;
+	struct igt_fb fb0, fb1;
+	igt_output_t *output = igt_get_single_output_for_pipe(display, pipe);
+
+	igt_require_f(output, "No connector found for pipe %s\n",
+			kmstest_pipe_name(pipe));
+
+	igt_require_pipe(display, pipe);
+	igt_display_reset(display);
+	igt_output_set_pipe(output, pipe);
+
+	mode = igt_output_get_mode(output);
+
+	/* Create two framebuffers with the same color info. */
+	igt_create_color_fb(data->drm_fd,
+			mode->hdisplay, mode->vdisplay,
+			DRM_FORMAT_XRGB8888,
+			LOCAL_DRM_FORMAT_MOD_NONE,
+			1.0, 1.0, 1.0,
+			&fb0);
+	igt_create_color_fb(data->drm_fd,
+			mode->hdisplay, mode->vdisplay,
+			DRM_FORMAT_XRGB8888,
+			LOCAL_DRM_FORMAT_MOD_NONE,
+			1.0, 1.0, 1.0,
+			&fb1);
+
+	/* Flip FB0 with the Primary plane & collect the CRC as ref CRC. */
+	primary = igt_output_get_plane_type(output, DRM_PLANE_TYPE_PRIMARY);
+	igt_plane_set_fb(primary, &fb0);
+	igt_display_commit(display);
+
+	pipe_crc = igt_pipe_crc_new(data->drm_fd, pipe,
+				    INTEL_PIPE_CRC_SOURCE_AUTO);
+	igt_pipe_crc_collect_crc(pipe_crc, &ref_crc);
+
+	/* Flip FB1 with the Primary plane & compare the CRC with ref CRC. */
+	igt_plane_set_fb(primary, &fb1);
+	igt_display_commit(display);
+
+	igt_pipe_crc_collect_crc(pipe_crc, &crc);
+	igt_assert_crc_equal(&crc, &ref_crc);
+
+	/* Clean-up */
+	igt_pipe_crc_free(pipe_crc);
+	igt_plane_set_fb(primary, NULL);
+	igt_output_set_pipe(output, PIPE_NONE);
+	igt_display_commit(display);
+
+	igt_remove_fb(data->drm_fd, &fb0);
+	igt_remove_fb(data->drm_fd, &fb1);
+}
+
 data_t data = {0, };
 
 igt_main
@@ -209,6 +278,10 @@ igt_main
 
 			igt_disallow_hang(data.drm_fd, hang);
 		}
+
+		igt_describe("Basic sanity check for CRC mismatches");
+		igt_subtest_f("compare-crc-basic-%s", kmstest_pipe_name(pipe))
+			test_compare_crc(&data, pipe);
 	}
 
 	igt_fixture {
-- 
2.20.1