diff options
| author | Alex Frid <afrid@nvidia.com> | 2014-03-07 21:47:21 -0800 |
|---|---|---|
| committer | Yu-Huan Hsu <yhsu@nvidia.com> | 2014-03-10 11:41:20 -0700 |
| commit | 7f456e32678fc14c65142219dc52360d80ce65ca (patch) | |
| tree | b4c6adf304b26adfc51850e39b5012e1771b8820 /arch/arm/mach-tegra/tegra13_dvfs.c | |
| parent | 55204188e98f72a661edb62ed762047db12ca0b6 (diff) | |
ARM: tegra13: dvfs: Account for thermal floor slack
When calculating VDD_CORE floor imposed by VDD_CPU took into account
that in dfll-mode VDD_CPU rail will be at/above current thermal floor
however low is voltage specified in DVFS table for target frequency.
Set margin above thermal floor to 30mV. Lower dependency constraint at
VDD_CPU level 900mV from 870mV to 830mV (this limit was statically set
higher than necessary because 900mV is a cold floor, and thermal floor
slack was not accounted in resolution algorithm until this commit).
Bug 1461646
Change-Id: I11e00e7077496150e86f5ef56efede40febba1e9
Signed-off-by: Alex Frid <afrid@nvidia.com>
Reviewed-on: http://git-master/r/379284
Reviewed-by: Yu-Huan Hsu <yhsu@nvidia.com>
Diffstat (limited to 'arch/arm/mach-tegra/tegra13_dvfs.c')
| -rw-r--r-- | arch/arm/mach-tegra/tegra13_dvfs.c | 12 |
1 files changed, 10 insertions, 2 deletions
diff --git a/arch/arm/mach-tegra/tegra13_dvfs.c b/arch/arm/mach-tegra/tegra13_dvfs.c index f48ab5ca0967..da6981442dd1 100644 --- a/arch/arm/mach-tegra/tegra13_dvfs.c +++ b/arch/arm/mach-tegra/tegra13_dvfs.c @@ -135,7 +135,7 @@ static int tegra13_get_core_floor_mv(int cpu_mv) { if (cpu_mv < 800) return 800; - if (cpu_mv < 900) + if (cpu_mv <= 900) return 830; if (cpu_mv <= 1000) return 870; @@ -150,8 +150,16 @@ static int tegra13_get_core_floor_mv(int cpu_mv) static int tegra13_dvfs_rel_vdd_cpu_vdd_core(struct dvfs_rail *vdd_cpu, struct dvfs_rail *vdd_core) { + int core_mv; int cpu_mv = max(vdd_cpu->new_millivolts, vdd_cpu->millivolts); - int core_mv = tegra13_get_core_floor_mv(cpu_mv); + + if (tegra_dvfs_rail_is_dfll_mode(vdd_cpu)) { + /* 30mV thermal floor slack in dfll mode */ + int cpu_floor_mv = tegra_dvfs_rail_get_thermal_floor(vdd_cpu); + cpu_mv = max(cpu_mv, cpu_floor_mv + 30); + } + + core_mv = tegra13_get_core_floor_mv(cpu_mv); core_mv = max(vdd_core->new_millivolts, core_mv); if (vdd_cpu->resolving_to && (core_mv < vdd_core->millivolts)) |