Add a function to test the internal Tegra114 chip fuse that indicates whether the VDD_CPU lower voltage limit for the fast CPU cluster should be overridden.
Signed-off-by: Paul Walmsley <[email protected]> Cc: Stephen Warren <[email protected]> Cc: Thierry Reding <[email protected]> --- arch/arm/mach-tegra/fuse.c | 26 ++++++++++++++++++++++++++ include/linux/tegra-soc.h | 2 ++ 2 files changed, 28 insertions(+) diff --git a/arch/arm/mach-tegra/fuse.c b/arch/arm/mach-tegra/fuse.c index e3ca8abe858f..42477aa1b7e9 100644 --- a/arch/arm/mach-tegra/fuse.c +++ b/arch/arm/mach-tegra/fuse.c @@ -47,6 +47,15 @@ #define TEGRA20_FUSE_SPARE_BIT 0x200 #define TEGRA30_FUSE_SPARE_BIT 0x244 +/* + * TEGRA114_SPARE_FUSE_VDD_CPU_OVERRIDE: Spare eFuse ID that indicates + * whether the minimum VDD_CPU voltage level that the DFLL is + * characterized for should be overridden to 900mVdc. If unset, the + * voltage shouldn't be overridden - it will be whatever has been + * selected by the CPU Speedo and process IDs. + */ +#define TEGRA114_SPARE_FUSE_VDD_CPU_OVERRIDE 61 + int tegra_sku_id; int tegra_cpu_process_id; int tegra_core_process_id; @@ -265,3 +274,20 @@ int tegra_get_cpu_speedo_id(void) return tegra_cpu_speedo_id; } EXPORT_SYMBOL(tegra_get_cpu_speedo_id); + +/** + * tegra114_fuse_read_min_vdd_cpu_override - override DFLL VDD_CPU minimum? + * + * Returns true if the minimum VDD_CPU voltage level that the DFLL is + * characterized for is 900mVdc. If false, the minimum voltage should + * be whatever has been selected by the CPU Speedo and process IDs. + */ +bool tegra114_fuse_read_min_vdd_cpu_override(void) +{ + if (tegra_chip_id != TEGRA114) + return -EINVAL; + + return tegra_spare_fuse(TEGRA114_SPARE_FUSE_VDD_CPU_OVERRIDE) ? true : + false; +} +EXPORT_SYMBOL(tegra114_fuse_read_min_vdd_cpu_override); diff --git a/include/linux/tegra-soc.h b/include/linux/tegra-soc.h index ec856fdf2ce7..fe2ab641555e 100644 --- a/include/linux/tegra-soc.h +++ b/include/linux/tegra-soc.h @@ -21,4 +21,6 @@ u32 tegra_read_chipid(void); int tegra_get_cpu_process_id(void); int tegra_get_cpu_speedo_id(void); +bool tegra114_fuse_read_min_vdd_cpu_override(void); + #endif /* __LINUX_TEGRA_SOC_H_ */ -- To unsubscribe from this list: send the line "unsubscribe linux-tegra" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
