[Intel-gfx] [PATCH igt 2/2] igt/perf_pmu: Explicitly reset min_freq before max_freq

[Chris Wilson]

The kernel doesn't like it when you set max_freq < min_freq and
complains bitterly. So before setting max_freq = min_freq, first set
min_freq to min_freq!

Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
Cc: Tvrtko Ursulin <tvrtko.ursulin at intel.com>
---
 tests/perf_pmu.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/tests/perf_pmu.c b/tests/perf_pmu.c
index bcb90c84..b8422211 100644
--- a/tests/perf_pmu.c
+++ b/tests/perf_pmu.c
@@ -946,6 +946,8 @@ test_frequency(int gem_fd)
 	min_freq = igt_sysfs_get_u32(sysfs, "gt_RPn_freq_mhz");
 	max_freq = igt_sysfs_get_u32(sysfs, "gt_RP0_freq_mhz");
 	boost_freq = igt_sysfs_get_u32(sysfs, "gt_boost_freq_mhz");
+	igt_info("Frequency: min=%u, max=%u, boost=%u MHz\n",
+		 min_freq, max_freq, boost_freq);
 	igt_require(min_freq > 0 && max_freq > 0 && boost_freq > 0);
 	igt_require(max_freq > min_freq);
 	igt_require(boost_freq > min_freq);
@@ -956,6 +958,8 @@ test_frequency(int gem_fd)
 	/*
 	 * Set GPU to min frequency and read PMU counters.
 	 */
+	igt_require(igt_sysfs_set_u32(sysfs, "gt_min_freq_mhz", min_freq));
+	igt_require(igt_sysfs_get_u32(sysfs, "gt_min_freq_mhz") == min_freq);
 	igt_require(igt_sysfs_set_u32(sysfs, "gt_max_freq_mhz", min_freq));
 	igt_require(igt_sysfs_get_u32(sysfs, "gt_max_freq_mhz") == min_freq);
 	igt_require(igt_sysfs_set_u32(sysfs, "gt_boost_freq_mhz", min_freq));
-- 
2.15.0