[PATCH v2] drm/i915/selftests: Correct frequency handling in RPS power measurement

[Nilawar, Badal]

On 09-01-2025 15:00, sk.anirban at intel.com wrote:
> From: Sk Anirban<sk.anirban at intel.com>
>
> Fix the frequency calculation by ensuring it is adjusted
> only once during power measurement. Update live_rps_power test
> to use the correct frequency values for logging and comparison.
>
> v2:
>    - Improved frequency logging (Riana)
>
> Signed-off-by: Sk Anirban<sk.anirban at intel.com>
> Reviewed-by: Riana Tauro<riana.tauro at intel.com>
> ---
>   drivers/gpu/drm/i915/gt/selftest_rps.c | 11 ++++++-----
>   1 file changed, 6 insertions(+), 5 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/gt/selftest_rps.c b/drivers/gpu/drm/i915/gt/selftest_rps.c
> index c207a4fb03bf..e515d7eb628a 100644
> --- a/drivers/gpu/drm/i915/gt/selftest_rps.c
> +++ b/drivers/gpu/drm/i915/gt/selftest_rps.c
> @@ -1126,6 +1126,7 @@ static u64 measure_power_at(struct intel_rps *rps, int *freq)
>   {
>   	*freq = rps_set_check(rps, *freq);
>   	msleep(100);
> +	*freq = intel_gpu_freq(rps, *freq);

I am seeingrps_set_check will wait till act freq become desired freq, in case of 
timeout act freq could be different. I think it would be good to check 
freq returned by rps_set_check is expected freq if not then read freq 
again after msleep. Regards, Badal

>   	return measure_power(rps, freq);
>   }
>   
> @@ -1202,13 +1203,13 @@ int live_rps_power(void *arg)
>   
>   		pr_info("%s: min:%llumW @ %uMHz, max:%llumW @ %uMHz\n",
>   			engine->name,
> -			min.power, intel_gpu_freq(rps, min.freq),
> -			max.power, intel_gpu_freq(rps, max.freq));
> +			min.power, min.freq,
> +			max.power, max.freq);
>   
>   		if (10 * min.freq >= 9 * max.freq) {
> -			pr_notice("Could not control frequency, ran at [%d:%uMHz, %d:%uMhz]\n",
> -				  min.freq, intel_gpu_freq(rps, min.freq),
> -				  max.freq, intel_gpu_freq(rps, max.freq));
> +			pr_notice("Could not control frequency, ran at [%uMHz, %uMhz]\n",
> +				  min.freq,
> +				  max.freq);
>   			continue;
>   		}
>   
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