diff options
| author | Alex Frid <afrid@nvidia.com> | 2011-05-19 11:43:44 -0700 |
|---|---|---|
| committer | Niket Sirsi <nsirsi@nvidia.com> | 2011-05-23 17:34:46 -0700 |
| commit | 556ae71f5320b1e71fae9561dcc7d9aee5f3c9e1 (patch) | |
| tree | 7813dd93402e98c4e99519bf71e16d35c1778795 | |
| parent | fa93921f466410bd605cc59d5ac930b26f00c877 (diff) | |
ARM: tegra: clock: Prevent Tegra3 early boot CPU over-clocking
Prevent Tegra3 early boot CPU over-clocking, if cpufreq driver attempts
to scale CPU clock up before regulator initialization completes.
Change-Id: I9f0adb371de8f6f684109b2acb9ac1d761a0ab5c
Reviewed-on: http://git-master/r/32236
Reviewed-by: Niket Sirsi <nsirsi@nvidia.com>
Tested-by: Niket Sirsi <nsirsi@nvidia.com>
| -rw-r--r-- | arch/arm/mach-tegra/tegra3_clocks.c | 10 |
1 files changed, 9 insertions, 1 deletions
diff --git a/arch/arm/mach-tegra/tegra3_clocks.c b/arch/arm/mach-tegra/tegra3_clocks.c index 773294383beb..1129783c976c 100644 --- a/arch/arm/mach-tegra/tegra3_clocks.c +++ b/arch/arm/mach-tegra/tegra3_clocks.c @@ -38,6 +38,7 @@ #include "clock.h" #include "fuse.h" #include "power.h" +#include "dvfs.h" #define RST_DEVICES_L 0x004 #define RST_DEVICES_H 0x008 @@ -684,7 +685,14 @@ static void tegra3_cpu_clk_disable(struct clk *c) static int tegra3_cpu_clk_set_rate(struct clk *c, unsigned long rate) { int ret; - unsigned int backup_rate; + unsigned long backup_rate; + + if((!c->dvfs->dvfs_rail->reg) && (clk_get_rate_locked(c) < rate)) { + WARN(1, "Increasing CPU rate while regulator is not" + " ready may overclock CPU\n"); + return -ENOSYS; + } + /* * Take an extra reference to the main pll so it doesn't turn * off when we move the cpu off of it |