soc/braswell: Set max frequency to be turbo frequency
In set_max_freq, instead of using ratio from IA_CORE_RATIOS, using
ratio from MSR_IACORE_TURBO_RATIOS
Also, punit_init needs to be called before enabling this frequency.
Original-Reviewed-on: https://chromium-review.googlesource.com/295268
Original-Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Original-Tested-by: Hannah Williams <hannah.williams@intel.com>
Change-Id: Iabdab9ec45f8eef0a105a5a05dbcdb997b6764b0
Signed-off-by: Hannah Williams <hannah.williams@intel.com>
Reviewed-on: https://review.coreboot.org/12736
Tested-by: build bot (Jenkins)
Reviewed-by: Alexandru Gagniuc <mr.nuke.me@gmail.com>
Reviewed-by: Martin Roth <martinroth@google.com>
diff --git a/src/soc/intel/braswell/tsc_freq.c b/src/soc/intel/braswell/tsc_freq.c
index fff882e..f4f1a8b 100644
--- a/src/soc/intel/braswell/tsc_freq.c
+++ b/src/soc/intel/braswell/tsc_freq.c
@@ -72,18 +72,23 @@
msr.lo |= (1 << 16);
wrmsr(MSR_IA32_MISC_ENABLES, msr);
+ /* Enable Burst Mode */
+ msr = rdmsr(MSR_IA32_MISC_ENABLES);
+ msr.hi = 0;
+ wrmsr(MSR_IA32_MISC_ENABLES, msr);
+
/*
* Set guranteed ratio [21:16] from IACORE_RATIOS to bits [15:8] of
* the PERF_CTL.
*/
- msr = rdmsr(MSR_IACORE_RATIOS);
+ msr = rdmsr(MSR_IACORE_TURBO_RATIOS);
perf_ctl.lo = (msr.lo & 0x3f0000) >> 8;
/*
* Set guranteed vid [21:16] from IACORE_VIDS to bits [7:0] of
* the PERF_CTL.
*/
- msr = rdmsr(MSR_IACORE_VIDS);
+ msr = rdmsr(MSR_IACORE_TURBO_VIDS);
perf_ctl.lo |= (msr.lo & 0x7f0000) >> 16;
perf_ctl.hi = 0;