diff options
| author | Alex Frid <afrid@nvidia.com> | 2013-10-16 18:50:08 -0700 |
|---|---|---|
| committer | Yu-Huan Hsu <yhsu@nvidia.com> | 2013-10-28 12:27:58 -0700 |
| commit | 51321d1df95178d56799b17a665f1cd3f1740f31 (patch) | |
| tree | d3385edc7adf532c0994a3513e0665b95c6c266a /arch/arm/mach-tegra/cpu-tegra.h | |
| parent | eac8ece1897c63d898922a2914c43a21683cb824 (diff) | |
ARM: tegra: power: Add dynamic CPU regulator mode control
Operational mode of CPU voltage regulator depends on load current.
Commonly on Tegra platforms this dependency was handled by regulator
h/w itself. There are exceptions, however, introduced on some Tegra12
designs that requires s/w control of the mode.
In order to dynamically control regulator mode based on load,
s/w has to
(a) estimate load based on CPU frequency, number of on-line CPU cores,
and temperature
(b) compare load estimation with regulator specific threshold whenever
any of the above factors changes
(c) change regulator mode when the respective threshold is crossed
This commit adds layer (b) in cpu-tegra driver. It expects existing
Tegra CPU load calculator in EDP driver to implement (a), and provide
look-up table of frequency thresholds for each combination of on-line
CPU cores and temperature ranges. When the respective threshold is
crossed standard regulator mode change interface is called to carry
on (c).
Only switching between IDLE and NORMAL regulator modes is supported.
The respective EDP calculator functions are just stubbed, for now.
Bug 1302884
Change-Id: Iaea42a101aaea239643c0c80a7ad165ece3b1e36
Signed-off-by: Alex Frid <afrid@nvidia.com>
Reviewed-on: http://git-master/r/301520
Reviewed-by: Yu-Huan Hsu <yhsu@nvidia.com>
Diffstat (limited to 'arch/arm/mach-tegra/cpu-tegra.h')
| -rw-r--r-- | arch/arm/mach-tegra/cpu-tegra.h | 12 |
1 files changed, 11 insertions, 1 deletions
diff --git a/arch/arm/mach-tegra/cpu-tegra.h b/arch/arm/mach-tegra/cpu-tegra.h index 84504bb0ccc1..cd11c249b17c 100644 --- a/arch/arm/mach-tegra/cpu-tegra.h +++ b/arch/arm/mach-tegra/cpu-tegra.h @@ -1,7 +1,7 @@ /* * arch/arm/mach-tegra/cpu-tegra.h * - * Copyright (c) 2011-2013, NVIDIA Corporation. + * Copyright (c) 2011-2013, NVIDIA Corporation. All rights reserved. * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by @@ -65,4 +65,14 @@ static inline int tegra_suspended_target(unsigned int target_freq) { return -ENOSYS; } #endif +#if defined(CONFIG_CPU_FREQ) && defined(CONFIG_TEGRA_EDP_LIMITS) +int tegra_update_cpu_edp_limits(void); +int tegra_cpu_reg_mode_force_normal(bool force); +#else +static inline int tegra_update_cpu_edp_limits(void) +{ return 0; } +static inline int tegra_cpu_reg_mode_force_normal(bool force) +{ return 0; } +#endif + #endif /* __MACH_TEGRA_CPU_TEGRA_H */ |