[Intel-gfx] [PATCH] tests: debugfs_psr_status

[Rodrigo Vivi]

Check on debugfs if PSR is supported by panel and matching all conditions in
hardware. In this case PSR must be enabled and performance counting increasing

v2: check if performance counter is really increasing.

Signed-off-by: Rodrigo Vivi <rodrigo.vivi at gmail.com>
---
 tests/Makefile.am          |   1 +
 tests/debugfs_psr_status.c | 102 +++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 103 insertions(+)
 create mode 100644 tests/debugfs_psr_status.c

diff --git a/tests/Makefile.am b/tests/Makefile.am
index 99d98d6..82bc936 100644
--- a/tests/Makefile.am
+++ b/tests/Makefile.am
@@ -116,6 +116,7 @@ TESTS_progs = \
 	prime_udl \
 	sysfs_rc6_residency \
 	sysfs_rps \
+	debugfs_psr_status \
 	$(NULL)
 
 # IMPORTANT: The ZZ_ tests need to be run last!
diff --git a/tests/debugfs_psr_status.c b/tests/debugfs_psr_status.c
new file mode 100644
index 0000000..6139295
--- /dev/null
+++ b/tests/debugfs_psr_status.c
@@ -0,0 +1,102 @@
+/*
+ * Copyright (c) 2013 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.
+ *
+ * Authors:
+ *    Rodrigo Vivi <rodrigo.vivi at intel.com>
+ */
+
+#define _GNU_SOURCE
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include "drmtest.h"
+
+#define SLEEP_DURATION 5000 // in milliseconds
+
+static int get_perf(const char *path)
+{
+	int ret, perf;
+	bool sink, source, enabled;
+	FILE *file;
+	char str[4];
+
+	file = fopen(path, "r");
+	if (file == NULL) {
+		fprintf(stderr, "Couldn't open %s (%d)\n", path, errno);
+		abort();
+	}
+
+	ret = fscanf(file, "Sink_Support: %s\n", str);
+	if (ret == 0)
+	    igt_skip("i915_edp_psr_status format not supported by this test case\n");
+	sink = strcmp(str, "yes") == 0;
+	ret = fscanf(file, "Source_OK: %s\n", str);
+	igt_assert(ret != 0);
+	source = strcmp(str, "yes") == 0;
+	ret = fscanf(file, "Enabled: %s\n", str);
+	igt_assert(ret != 0);
+	enabled = strcmp(str, "yes") == 0;
+	ret = fscanf(file, "Performance_Counter: %i", &perf);
+
+	if (!sink)
+	    igt_skip("This panel does not support PSR.\n");
+
+	if (!source)
+	    igt_skip("This Hardware does not support or isn't ready for PSR\n");
+
+	if (!enabled) {
+	    fprintf(stderr, "PSR should be enabled\n");
+	    igt_fail(1);
+	}
+
+	if (perf == 0) {
+	    fprintf(stderr, "PSR state never achieved\n");
+	    igt_fail(1);
+	}
+
+	fclose(file);
+	return perf;
+}
+
+int main(int argc, char *argv[])
+{
+	int ret, perf1, perf2;
+	int device = drm_get_card();
+	char *path;
+
+	igt_skip_on_simulation();
+
+	ret = asprintf(&path, "/sys/kernel/debug/dri/%d/i915_edp_psr_status", device);
+	igt_assert(ret != -1);
+
+	perf1 = get_perf(path);
+	sleep(SLEEP_DURATION / 1000);
+	perf2 = get_perf(path);
+
+	if (perf1 == perf2) {
+	    fprintf(stderr, "Unable to enter PSR state again\n");
+	    igt_fail(1);
+	}
+
+	igt_success();
+}
-- 
1.8.1.4