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

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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: Sk Anirban <sk.anirban@intel.com>
Reviewed-by: Badal Nilawar <badal.nilawar@intel.com>
Reviewed-by: Andi Shyti <andi.shyti@linux.intel.com>
Signed-off-by: Andi Shyti <andi.shyti@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20250113095912.356147-3-sk.anirban@intel.com
This commit is contained in:
Sk Anirban 2025-01-13 15:29:12 +05:30 committed by Andi Shyti
parent d7364b86e4
commit 54cb728890
1 changed files with 16 additions and 1 deletions
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17
drivers/gpu/drm/i915/gt/selftest_slpc.c
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@ -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;
}