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Commit 31f731af authored by Alex Deucher's avatar Alex Deucher
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drm/radeon/dpm: fix calculations in si_calculate_leakage_for_v_and_t_formula 



Need to make some slight adjustments for the fixed point math to
work properly.

Signed-off-by: default avatarAlex Deucher <alexander.deucher@amd.com>
parent a838834b

drivers/gpu/drm/radeon/si_dpm.c

+5 −3
Original line number Diff line number Diff line
@@ -1765,8 +1765,9 @@ static void si_calculate_leakage_for_v_and_t_formula(const struct ni_leakage_coe 
{

	s64 kt, kv, leakage_w, i_leakage, vddc;

	s64 temperature, t_slope, t_intercept, av, bv, t_ref;

	s64 tmp;



	i_leakage = drm_int2fixp(ileakage / 100);

	i_leakage = drm_int2fixp(ileakage) / 100;

	vddc = div64_s64(drm_int2fixp(v), 1000);

	temperature = div64_s64(drm_int2fixp(t), 1000);
@@ -1776,8 +1777,9 @@ static void si_calculate_leakage_for_v_and_t_formula(const struct ni_leakage_coe 
	bv = div64_s64(drm_int2fixp(coeff->bv), 100000000);

	t_ref = drm_int2fixp(coeff->t_ref);



	kt = drm_fixp_div(drm_fixp_exp(drm_fixp_mul(drm_fixp_mul(t_slope, vddc) + t_intercept, temperature)),

			  drm_fixp_exp(drm_fixp_mul(drm_fixp_mul(t_slope, vddc) + t_intercept, t_ref)));

	tmp = drm_fixp_mul(t_slope, vddc) + t_intercept;

	kt = drm_fixp_exp(drm_fixp_mul(tmp, temperature));

	kt = drm_fixp_div(kt, drm_fixp_exp(drm_fixp_mul(tmp, t_ref)));

	kv = drm_fixp_mul(av, drm_fixp_exp(drm_fixp_mul(bv, vddc)));



	leakage_w = drm_fixp_mul(drm_fixp_mul(drm_fixp_mul(i_leakage, kt), kv), vddc);