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| author | Alex Deucher <alexander.deucher@amd.com> | 2013-07-30 20:56:52 (GMT) |
|---|---|---|
| committer | Alex Deucher <alexander.deucher@amd.com> | 2013-07-30 21:24:13 (GMT) |
| commit | 31f731af513bb9925d0a29dba34bb4f71141bf91 (patch) | |
| tree | 55214f3c0abe069b792377f3d8aa0fb4d121e727 | |
| parent | a838834b2f7cbc09b6319a1fc332c03e4d665b20 (diff) | |
| download | linux-31f731af513bb9925d0a29dba34bb4f71141bf91.tar.xz | |
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: Alex Deucher <alexander.deucher@amd.com>
| -rw-r--r-- | drivers/gpu/drm/radeon/si_dpm.c | 8 |
1 files changed, 5 insertions, 3 deletions
diff --git a/drivers/gpu/drm/radeon/si_dpm.c b/drivers/gpu/drm/radeon/si_dpm.c index 1604a87..cfb4448 100644 --- a/drivers/gpu/drm/radeon/si_dpm.c +++ b/drivers/gpu/drm/radeon/si_dpm.c @@ -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); |