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| author | Subrata Banik <subrata.banik@intel.com> | 2015-08-05 17:01:55 +0530 |
|---|---|---|
| committer | Martin Roth <martinroth@google.com> | 2016-01-14 19:17:01 +0100 |
| commit | 45a221de7923d6c1d52f9ca14a3419e7d0803636 (patch) | |
| tree | e3f742125a2939b6a035720ccb2b5820934b375c /src/soc/intel/braswell/tsc_freq.c | |
| parent | baf00e6b28efcf02497a566fa6f0f43d11304406 (diff) | |
| download | coreboot-45a221de7923d6c1d52f9ca14a3419e7d0803636.tar.xz | |
soc/braswell: Fix P-state table
Incorrect bus-core-ratio been used to generate P-state table
Original-Reviewed-on: https://chromium-review.googlesource.com/290681
Original-Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Change-Id: I4a34ec80ff3f2ed46dc074c9f8fe06756db8b357
Signed-off-by: Subrata Banik <subrata.banik@intel.com>
Reviewed-on: https://review.coreboot.org/12731
Tested-by: build bot (Jenkins)
Reviewed-by: Martin Roth <martinroth@google.com>
Diffstat (limited to 'src/soc/intel/braswell/tsc_freq.c')
| -rw-r--r-- | src/soc/intel/braswell/tsc_freq.c | 32 |
1 files changed, 29 insertions, 3 deletions
diff --git a/src/soc/intel/braswell/tsc_freq.c b/src/soc/intel/braswell/tsc_freq.c index 284ba2b23e..fff882eb9b 100644 --- a/src/soc/intel/braswell/tsc_freq.c +++ b/src/soc/intel/braswell/tsc_freq.c @@ -26,12 +26,38 @@ #endif #include <stdint.h> +static const unsigned int cpu_bus_clk_freq_table[] = { + 83333, + 100000, + 133333, + 116666, + 80000, + 93333, + 90000, + 88900, + 87500 +}; + +unsigned int cpu_bus_freq_khz(void) +{ + msr_t clk_info = rdmsr(MSR_BSEL_CR_OVERCLOCK_CONTROL); + if((clk_info.lo & 0xF) < (sizeof(cpu_bus_clk_freq_table)/sizeof(unsigned int))) + { + return(cpu_bus_clk_freq_table[clk_info.lo & 0xF]); + } + return 0; +} + unsigned long tsc_freq_mhz(void) { - msr_t ia_core_ratios; + msr_t platform_info; + unsigned int bclk_khz = cpu_bus_freq_khz(); + + if (!bclk_khz) + return 0; - ia_core_ratios = rdmsr(MSR_IACORE_RATIOS); - return (BUS_FREQ_KHZ * ((ia_core_ratios.lo >> 16) & 0x3f)) / 1000; + platform_info = rdmsr(MSR_PLATFORM_INFO); + return (bclk_khz * ((platform_info.lo >> 8) & 0xff)) / 1000; } #if !ENV_SMM |