[igt-dev] [i-g-t V2] tests/kms: s/i915_frequency_info/i915_cdclk_info/

[Bhanuprakash Modem <bhanuprakash.modem@intel.com>]

Read display specific clock frequency info from debugfs
"i915_cdclk_info".

V2: - For older Kernels, readback from i915_frequency_info

Signed-off-by: Bhanuprakash Modem <bhanuprakash.modem@intel.com>
---
 tests/i915/kms_cdclk.c   | 10 +++++++++-
 tests/kms_invalid_mode.c | 23 +++++++++++++++++++----
 2 files changed, 28 insertions(+), 5 deletions(-)

diff --git a/tests/i915/kms_cdclk.c b/tests/i915/kms_cdclk.c
index 23d9d3b02e2..bb003680229 100644
--- a/tests/i915/kms_cdclk.c
+++ b/tests/i915/kms_cdclk.c
@@ -61,8 +61,16 @@ static int get_current_cdclk_freq(int debugfs_fd)
 	char *start_loc;
 	int res;
 
-	res = igt_debugfs_simple_read(debugfs_fd, "i915_frequency_info",
+	/*
+	 * Display specific clock frequency info is moved to i915_cdclk_info,
+	 * On older kernels if this debugfs is not found, fallback to read from
+	 * i915_frequency_info.
+	 */
+	res = igt_debugfs_simple_read(debugfs_fd, "i915_cdclk_info",
 				      buf, sizeof(buf));
+	if (res <= 0)
+		res = igt_debugfs_simple_read(debugfs_fd, "i915_frequency_info",
+					      buf, sizeof(buf));
 	igt_require(res > 0);
 
 	igt_assert(start_loc = strstr(buf, "Current CD clock frequency: "));
diff --git a/tests/kms_invalid_mode.c b/tests/kms_invalid_mode.c
index 86f529e88b1..6ef36d3cc98 100644
--- a/tests/kms_invalid_mode.c
+++ b/tests/kms_invalid_mode.c
@@ -217,14 +217,29 @@ static int i915_max_dotclock(data_t *data)
 {
 	char buf[4096];
 	char *s;
-	int max_dotclock = 0;
+	int dir, res, max_dotclock = 0;
 
 	if (!is_i915_device(data->drm_fd))
 		return 0;
 
-	igt_debugfs_read(data->drm_fd, "i915_frequency_info", buf);
-	s = strstr(buf, "Max pixel clock frequency:");
-	igt_assert(s);
+	dir = igt_debugfs_dir(data->drm_fd);
+	igt_require(dir);
+
+	/*
+	 * Display specific clock frequency info is moved to i915_cdclk_info,
+	 * On older kernels if this debugfs is not found, fallback to read from
+	 * i915_frequency_info.
+	 */
+	res = igt_debugfs_simple_read(dir, "i915_cdclk_info",
+				      buf, sizeof(buf));
+	if (res <= 0)
+		res = igt_debugfs_simple_read(dir, "i915_frequency_info",
+					      buf, sizeof(buf));
+	close(dir);
+
+	igt_require(res > 0);
+
+	igt_assert(s = strstr(buf, "Max pixel clock frequency:"));
 	igt_assert_eq(sscanf(s, "Max pixel clock frequency: %d kHz", &max_dotclock), 1);
 
 	/* 100 Mhz to 5 GHz seem like reasonable values to expect */
-- 
2.40.0