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drm/radeon/dpm/cayman: use new fixed point functions (v2)

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Use the new fixed point functions for leakage
calculations on cayman.

v2: fix up 64 bit math

Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Alex Deucher 2013-03-22 10:43:00 -04:00
parent 210a0b9e21
commit b253e4b359
1 changed files with 11 additions and 35 deletions
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46
drivers/gpu/drm/radeon/ni_dpm.c
View file

@ -27,6 +27,7 @@
#include "r600_dpm.h" #include "r600_dpm.h"
#include "ni_dpm.h" #include "ni_dpm.h"
#include "atom.h" #include "atom.h"
#include <linux/math64.h>
#define MC_CG_ARB_FREQ_F0 0x0a #define MC_CG_ARB_FREQ_F0 0x0a
#define MC_CG_ARB_FREQ_F1 0x0b #define MC_CG_ARB_FREQ_F1 0x0b
@ -732,50 +733,25 @@ struct ni_ps *ni_get_ps(struct radeon_ps *rps)
return ps; return ps;
} }
/* XXX: fix for kernel use */
#if 0
static double ni_exp(double x)
{
int count = 1;
double sum = 1.0, term, tolerance = 0.000000001, y = x;
if (x < 0)
y = -1 * x;
term = y;
while (term >= tolerance) {
sum = sum + term;
count = count + 1;
term = term * (y / count);
}
if (x < 0)
sum = 1.0 / sum;
return sum;
}
#endif
static void ni_calculate_leakage_for_v_and_t_formula(const struct ni_leakage_coeffients *coeff, static void ni_calculate_leakage_for_v_and_t_formula(const struct ni_leakage_coeffients *coeff,
u16 v, s32 t, u16 v, s32 t,
u32 ileakage, u32 ileakage,
u32 *leakage) u32 *leakage)
{ {
/* XXX: fix for kernel use */ s64 kt, kv, leakage_w, i_leakage, vddc, temperature;
#if 0
double kt, kv, leakage_w, i_leakage, vddc, temperature;
i_leakage = ((double)ileakage) / 1000; i_leakage = div64_s64(drm_int2fixp(ileakage), 1000);
vddc = ((double)v) / 1000; vddc = div64_s64(drm_int2fixp(v), 1000);
temperature = ((double)t) / 1000; temperature = div64_s64(drm_int2fixp(t), 1000);
kt = (((double)(coeff->at)) / 1000) * ni_exp((((double)(coeff->bt)) / 1000) * temperature); kt = drm_fixp_mul(div64_s64(drm_int2fixp(coeff->at), 1000),
kv = (((double)(coeff->av)) / 1000) * ni_exp((((double)(coeff->bv)) / 1000) * vddc); drm_fixp_exp(drm_fixp_mul(div64_s64(drm_int2fixp(coeff->bt), 1000), temperature)));
kv = drm_fixp_mul(div64_s64(drm_int2fixp(coeff->av), 1000),
drm_fixp_exp(drm_fixp_mul(div64_s64(drm_int2fixp(coeff->bv), 1000), vddc)));
leakage_w = i_leakage * kt * kv * vddc; leakage_w = drm_fixp_mul(drm_fixp_mul(drm_fixp_mul(i_leakage, kt), kv), vddc);
*leakage = (u32)(leakage_w * 1000); *leakage = drm_fixp2int(leakage_w * 1000);
#endif
} }
static void ni_calculate_leakage_for_v_and_t(struct radeon_device *rdev, static void ni_calculate_leakage_for_v_and_t(struct radeon_device *rdev,