test/kms_dp_dsc: Basic KMS test to validate VESA DSC on DP/eDP

This patch adds a basic kms test to validate the display stream
compression functionality if supported on DP/eDP connector.
Currently this has only two subtests to force the DSC on all
the eDP and DP connectors that support it with default parameters.
This will be expanded to add more subtests to tweak DSC parameters.

v8 (from Manasi):
* Fix the logic to scan through all connectors even if some dont
support DSC/FEC (Petri)
* Fix the skip test logic if no connectors support DSC to avoid
false positives (Petri)
* Move test clenup to run_test
v7: (from Anusha)
* Code Style changes.(Petri)
* Use for_each_pipe() instead of for_each_pipe_static().(Petri)
* Correct logic by avoiding skipping of inner for loop completely.(Petri)
v6: (from Anusha)
* Fix run_test() (Petri)
* Fix update_display() to avoid leaks. (Petri)
v5:
* Fix test cleanup to avoid crash (Petri)
v4:
* Future proof for more test types (Petri)
* Fix alphabetical order (Petri)
* s/igt_display_init/igt_display_require (Petri)
* Remove blank lines after return (Petri)
v3:
* Use array of connectors and loop through (Petri)
* Also check for FEC on DP connectors (Manasi)
* Add a Pipe_A restriction on DP (Ville)
v2:
* Use IGT wrappers for all (DK, Antonio)
* Split into two subtests for eDP and DP types (Petri)

Cc: Petri Latvala <petri.latvala@intel.com>
Cc: Antonio Argenziano <antonio.argenziano@intel.com>
Cc: Dhinakaran Pandiyan <dhinakaran.pandiyan@intel.com>
Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
Cc: Anusha Srivatsa <anusha.srivatsa@intel.com>
Signed-off-by: Anusha Srivatsa <anusha.srivatsa@intel.com>
Signed-off-by: Manasi Navare <manasi.d.navare@intel.com>
Reviewed-by: Petri Latvala <petri.latvala@intel.com>

1 files changed, 265 insertions, 0 deletions

diff --git a/tests/kms_dp_dsc.c b/tests/kms_dp_dsc.c
new file mode 100644
index 00000000..9792be33
--- /dev/null
+++ b/tests/kms_dp_dsc.c
@@ -0,0 +1,265 @@
+/*
+ * Copyright © 2018 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 AUTHORS OR COPYRIGHT HOLDERS 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.
+ *
+ * Displayport Display Stream Compression test
+ * Until the CRC support is added this needs to be invoked with --interactive
+ * to manually verify if the test pattern is seen without corruption for each
+ * subtest.
+ *
+ * Authors:
+ * Manasi Navare <manasi.d.navare@intel.com>
+ *
+ */
+#include "igt.h"
+#include "igt_sysfs.h"
+#include <errno.h>
+#include <getopt.h>
+#include <math.h>
+#include <stdint.h>
+#include <stdbool.h>
+#include <strings.h>
+#include <unistd.h>
+#include <stdlib.h>
+#include <signal.h>
+#include <time.h>
+#include <fcntl.h>
+#include <termios.h>
+
+enum dsc_test_type
+{
+	test_basic_dsc_enable
+};
+
+typedef struct {
+	int drm_fd;
+	int debugfs_fd;
+	uint32_t id;
+	igt_display_t display;
+	struct igt_fb fb_test_pattern;
+	igt_output_t *output;
+	int mode_valid;
+	drmModeModeInfo *mode;
+	drmModeConnector *connector;
+	drmModeEncoder *encoder;
+	int crtc;
+	enum pipe pipe;
+	char conn_name[128];
+} data_t;
+
+static inline void manual(const char *expected)
+{
+	igt_debug_manual_check("all", expected);
+}
+
+static bool is_dp_dsc_supported(data_t *data)
+{
+	char file_name[128] = {0};
+	char buf[512];
+
+	strcpy(file_name, data->conn_name);
+	strcat(file_name, "/i915_dsc_fec_support");
+	igt_require(igt_debugfs_simple_read(data->debugfs_fd, file_name, buf,
+					    sizeof(buf)) > 0);
+	igt_debugfs_read(data->drm_fd, file_name, buf);
+
+	return strstr(buf, "DSC_Sink_Support: yes");
+}
+
+static bool is_dp_fec_supported(data_t *data)
+{
+	char file_name[128] = {0};
+	char buf[512];
+
+	strcpy(file_name, data->conn_name);
+	strcat(file_name, "/i915_dsc_fec_support");
+	igt_debugfs_read(data->drm_fd, file_name, buf);
+
+	return strstr(buf, "FEC_Sink_Support: yes");
+}
+
+static bool is_dp_dsc_enabled(data_t *data)
+{
+	char file_name[128] = {0};
+	char buf[512];
+
+	strcpy(file_name, data->conn_name);
+	strcat(file_name, "/i915_dsc_fec_support");
+	igt_debugfs_read(data->drm_fd, file_name, buf);
+
+	return strstr(buf, "DSC_Enabled: yes");
+}
+
+static void force_dp_dsc_enable(data_t *data)
+{
+	char file_name[128] = {0};
+	int ret;
+
+	strcpy(file_name, data->conn_name);
+	strcat(file_name, "/i915_dsc_fec_support");
+	igt_debug ("Forcing DSC enable on %s\n", data->conn_name);
+	ret = igt_sysfs_write(data->debugfs_fd, file_name, "1", 1);
+	igt_assert_f(ret > 0, "debugfs_write failed");
+}
+
+static void clear_dp_dsc_enable(data_t *data)
+{
+	char file_name[128] = {0};
+	int ret;
+
+	strcpy(file_name, data->conn_name);
+	strcat(file_name, "/i915_dsc_fec_support");
+	igt_debug ("Clearing DSC enable on %s\n", data->conn_name);
+	ret = igt_sysfs_write(data->debugfs_fd, file_name, "0", 1);
+	igt_assert_f(ret > 0, "debugfs_write failed");
+}
+
+static void test_cleanup(data_t *data) {
+	igt_plane_t *primary;
+
+	if (data->output) {
+		primary = igt_output_get_plane_type(data->output,
+						    DRM_PLANE_TYPE_PRIMARY);
+		igt_plane_set_fb(primary, NULL);
+		igt_display_commit(&data->display);
+		igt_remove_fb(data->drm_fd, &data->fb_test_pattern);
+	}
+}
+
+
+/*
+ * Re-probe connectors and do a modeset with DSC
+ *
+ */
+static void update_display(data_t *data, enum dsc_test_type test_type)
+{
+	igt_plane_t *primary;
+	data->mode = igt_output_get_mode(data->output);
+	data->connector = data->output->config.connector;
+
+	if (data->connector->connector_type == DRM_MODE_CONNECTOR_DisplayPort &&
+	    data->pipe == PIPE_A) {
+		igt_debug ("DSC not supported on Pipe A on external DP\n");
+		return;
+	}
+
+	if (test_type == test_basic_dsc_enable) {
+		igt_debug ("DSC is supported on %s\n",
+			   data->conn_name);
+		force_dp_dsc_enable(data);
+		igt_create_pattern_fb(data->drm_fd, data->mode->hdisplay,
+				      data->mode->vdisplay,
+				      DRM_FORMAT_XRGB8888,
+				      LOCAL_DRM_FORMAT_MOD_NONE,
+				      &data->fb_test_pattern);
+		primary = igt_output_get_plane_type(data->output,
+						    DRM_PLANE_TYPE_PRIMARY);
+		igt_plane_set_fb(primary, &data->fb_test_pattern);
+		igt_display_commit(&data->display);
+		/* Until we have CRC check support, manually check if RGB test pattern has no corruption */
+		manual ("RGB test pattern without corruption");
+		igt_assert_f(is_dp_dsc_enabled(data),
+			     "Default DSC enable failed on Connector: %s Pipe: %s",
+			     data->conn_name,
+			     kmstest_pipe_name(data->pipe));
+		clear_dp_dsc_enable(data);
+	} else {
+		igt_assert(!"Unknown test type\n");
+	}
+}
+
+static void run_test(data_t *data, igt_output_t *output,
+		     enum dsc_test_type test_type)
+{
+	enum pipe pipe;
+
+	for_each_pipe(&data->display, pipe) {
+
+		if (igt_pipe_connector_valid(pipe, output)) {
+			igt_output_set_pipe(output, pipe);
+			data->pipe = pipe;
+			data->output = output;
+			update_display(data, test_type);
+			test_cleanup(data);
+		}
+	}
+}
+
+igt_main
+{
+	data_t data = {};
+	igt_output_t *output;
+	drmModeRes *res;
+	drmModeConnector *connector;
+	int i, test_conn_cnt, test_cnt;
+	int tests[] = {DRM_MODE_CONNECTOR_eDP, DRM_MODE_CONNECTOR_DisplayPort};
+
+	igt_fixture {
+		data.drm_fd = drm_open_driver_master(DRIVER_ANY);
+		data.debugfs_fd = igt_debugfs_dir(data.drm_fd);
+		kmstest_set_vt_graphics_mode();
+		igt_display_require(&data.display, data.drm_fd);
+		igt_require(res = drmModeGetResources(data.drm_fd));
+	}
+
+	for (test_cnt = 0; test_cnt < ARRAY_SIZE(tests); test_cnt++) {
+
+		igt_subtest_f("basic-dsc-enable-%s",
+			      kmstest_connector_type_str(tests[test_cnt])) {
+			test_conn_cnt = 0;
+			for (i = 0; i < res->count_connectors; i++) {
+				connector = drmModeGetConnectorCurrent(data.drm_fd,
+								       res->connectors[i]);
+				if (connector->connection != DRM_MODE_CONNECTED ||
+				    connector->connector_type !=
+				    tests[test_cnt])
+					continue;
+				output = igt_output_from_connector(&data.display, connector);
+				sprintf(data.conn_name, "%s-%d",
+					kmstest_connector_type_str(connector->connector_type),
+					connector->connector_type_id);
+				if(!is_dp_dsc_supported(&data)) {
+					igt_debug("DSC not supported on connector %s \n",
+						  data.conn_name);
+					continue;
+				}
+				if (connector->connector_type == DRM_MODE_CONNECTOR_DisplayPort &&
+				    !is_dp_fec_supported(&data)) {
+					igt_debug("DSC cannot be enabled without FEC on %s\n",
+						  data.conn_name);
+					continue;
+				}
+				test_conn_cnt++;
+				run_test(&data, output, test_basic_dsc_enable);
+			}
+			igt_skip_on(test_conn_cnt == 0);
+		}
+	}
+
+	igt_fixture {
+		drmModeFreeConnector(connector);
+		drmModeFreeResources(res);
+		close(data.debugfs_fd);
+		close(data.drm_fd);
+		igt_display_fini(&data.display);
+	}
+	igt_exit();
+}