diff options
Diffstat (limited to 'arch/arm/mach-tegra/tegra3_dvfs.c')
| -rw-r--r-- | arch/arm/mach-tegra/tegra3_dvfs.c | 43 |
1 files changed, 43 insertions, 0 deletions
diff --git a/arch/arm/mach-tegra/tegra3_dvfs.c b/arch/arm/mach-tegra/tegra3_dvfs.c index d07195366bf6..1acc76a3eda3 100644 --- a/arch/arm/mach-tegra/tegra3_dvfs.c +++ b/arch/arm/mach-tegra/tegra3_dvfs.c @@ -26,6 +26,7 @@ #include "dvfs.h" #include "fuse.h" #include "board.h" +#include "tegra3_emc.h" static bool tegra_dvfs_cpu_disabled; static bool tegra_dvfs_core_disabled; @@ -518,6 +519,48 @@ void __init tegra_soc_init_dvfs(void) tegra_dvfs_core_disabled ? "disabled" : "enabled"); } +int tegra_dvfs_rail_disable_prepare(struct dvfs_rail *rail) +{ + int ret = 0; + + if (tegra_emc_get_dram_type() != DRAM_TYPE_DDR3) + return ret; + + if (((&tegra3_dvfs_rail_vdd_core == rail) && + (rail->nominal_millivolts > TEGRA_EMC_BRIDGE_MVOLTS_MIN)) || + ((&tegra3_dvfs_rail_vdd_cpu == rail) && + (tegra3_get_core_floor_mv(rail->nominal_millivolts) > + TEGRA_EMC_BRIDGE_MVOLTS_MIN))) { + struct clk *bridge = tegra_get_clock_by_name("bridge.emc"); + BUG_ON(!bridge); + + ret = clk_enable(bridge); + pr_info("%s: %s: %s bridge.emc\n", __func__, + rail->reg_id, ret ? "failed to enable" : "enabled"); + } + return ret; +} + +int tegra_dvfs_rail_post_enable(struct dvfs_rail *rail) +{ + if (tegra_emc_get_dram_type() != DRAM_TYPE_DDR3) + return 0; + + if (((&tegra3_dvfs_rail_vdd_core == rail) && + (rail->nominal_millivolts > TEGRA_EMC_BRIDGE_MVOLTS_MIN)) || + ((&tegra3_dvfs_rail_vdd_cpu == rail) && + (tegra3_get_core_floor_mv(rail->nominal_millivolts) > + TEGRA_EMC_BRIDGE_MVOLTS_MIN))) { + struct clk *bridge = tegra_get_clock_by_name("bridge.emc"); + BUG_ON(!bridge); + + clk_disable(bridge); + pr_info("%s: %s: disabled bridge.emc\n", + __func__, rail->reg_id); + } + return 0; +} + /* * sysfs and dvfs interfaces to cap tegra core domains frequencies */ |