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>

1 files changed, 7 insertions, 2 deletions

diff --git a/src/soc/intel/braswell/tsc_freq.c b/src/soc/intel/braswell/tsc_freq.c
index fff882eb9b..f4f1a8be8c 100644
--- a/src/soc/intel/braswell/tsc_freq.c
+++ b/src/soc/intel/braswell/tsc_freq.c
@@ -72,18 +72,23 @@ void set_max_freq(void)
 	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;