Re: [PATCH] tests/intel/perf_pmu: Ignore SLPC efficient freq during test

["Nilawar, Badal" <badal.nilawar@intel.com>]

On 09-04-2026 14:37, Sk Anirban wrote:
> Disable SLPC efficient frequency before pinning the GPU to min/max
> frequency ranges. This ensures the driver-requested frequency stays
> within the desired range during measurement.
> Without this, SLPC may override the pinned frequency, causing the
> test to report values outside the expected min/max bounds.
>
> Closes: https://gitlab.freedesktop.org/drm/i915/kernel/-/issues/12549
> Signed-off-by: Sk Anirban <sk.anirban@intel.com>
> ---
>   tests/intel/perf_pmu.c | 5 +++++
>   1 file changed, 5 insertions(+)
>
> diff --git a/tests/intel/perf_pmu.c b/tests/intel/perf_pmu.c
> index 661ead32d..1e389958f 100644
> --- a/tests/intel/perf_pmu.c
> +++ b/tests/intel/perf_pmu.c
> @@ -1521,6 +1521,8 @@ test_frequency(int gem_fd, unsigned int gt)
>   	fd[0] = open_group(gem_fd, __I915_PMU_REQUESTED_FREQUENCY(gt), -1);
>   	fd[1] = open_group(gem_fd, __I915_PMU_ACTUAL_FREQUENCY(gt), fd[0]);
>   
> +	igt_pm_ignore_slpc_efficient_freq(gem_fd, sysfs, true);
> +
>   	/*
>   	 * Set GPU to min frequency and read PMU counters.
>   	 */
> @@ -1586,8 +1588,11 @@ test_frequency(int gem_fd, unsigned int gt)
>   	igt_warn_on_f(read_value != min_freq,
>   		      "Unable to restore min frequency to saved value [%u MHz], now %u MHz\n",
>   		      min_freq, read_value);
> +	igt_pm_ignore_slpc_efficient_freq(gem_fd, sysfs, false);
> +
>   	close(fd[0]);
>   	close(fd[1]);
> +	close(sysfs);

LGTM.
Reviewed-by: Badal Nilawar <badal.nilawar@intel.com>

Thanks,
Badal

>   	put_ahnd(ahnd);
>   
>   	igt_info("Min frequency: requested %.1f, actual %.1f\n",