Commit 54cb7288 authored by Sk Anirban's avatar Sk Anirban Committed by Andi Shyti
Browse files

drm/i915/guc/slpc: Add helper function slpc_measure_power 



Previously, the RPS function was being used, which utilizes
raw frequency to calculate measured power. This commit introduces
a dedicated function specifically for measuring power in SLPC,
ensuring more accurate and reliable power measurements.

Signed-off-by: default avatarSk Anirban <sk.anirban@intel.com>
Reviewed-by: default avatarBadal Nilawar <badal.nilawar@intel.com>
Reviewed-by: default avatarAndi Shyti <andi.shyti@linux.intel.com>
Signed-off-by: default avatarAndi Shyti <andi.shyti@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20250113095912.356147-3-sk.anirban@intel.com
parent d7364b86

drivers/gpu/drm/i915/gt/selftest_slpc.c

+16 −1
Original line number Diff line number Diff line
@@ -95,6 +95,21 @@ static int slpc_restore_freq(struct intel_guc_slpc *slpc, u32 min, u32 max) 
	return 0;

}



static u64 slpc_measure_power(struct intel_rps *rps, int *freq)

{

	u64 x[5];

	int i;



	for (i = 0; i < 5; i++)

		x[i] = __measure_power(5);



	*freq = (*freq + intel_rps_read_actual_frequency(rps)) / 2;



	/* A simple triangle filter for better result stability */

	sort(x, 5, sizeof(*x), cmp_u64, NULL);

	return div_u64(x[1] + 2 * x[2] + x[3], 4);

}



static u64 measure_power_at_freq(struct intel_gt *gt, int *freq, u64 *power)

{

	int err = 0;
@@ -103,7 +118,7 @@ static u64 measure_power_at_freq(struct intel_gt *gt, int *freq, u64 *power) 
	if (err)

		return err;

	*freq = intel_rps_read_actual_frequency(&gt->rps);

	*power = measure_power(&gt->rps, freq);

	*power = slpc_measure_power(&gt->rps, freq);



	return err;

}