[S] Change in coreboot[main]: soc/intel/xeon_sp/spr: Use default turbo ratio

[Patrick Rudolph (Code Review)]

Patrick Rudolph has uploaded this change for review. ( https://review.coreboot.org/c/coreboot/+/86604?usp=email )

Change subject: soc/intel/xeon_sp/spr: Use default turbo ratio
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soc/intel/xeon_sp/spr: Use default turbo ratio

Allow a board to use the default turbo ratio by not specifying
turbo_ratio_limit and turbo_ratio_limit_cores in the devicetree.cb.

FIXES: Intel PTAT tool no longer complains about 0Mhz turbo frequency.

Change-Id: Ib8fbc78997fc7f8e6c80b2029d63b70f6117542e
Signed-off-by: Patrick Rudolph 
---
M src/soc/intel/xeon_sp/spr/cpu.c
1 file changed, 10 insertions(+), 6 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/04/86604/1

diff --git a/src/soc/intel/xeon_sp/spr/cpu.c b/src/soc/intel/xeon_sp/spr/cpu.c
index febc72b..383bf5f 100644
--- a/src/soc/intel/xeon_sp/spr/cpu.c
+++ b/src/soc/intel/xeon_sp/spr/cpu.c
@@ -95,14 +95,18 @@
    wrmsr(MSR_VR_CURRENT_CONFIG, msr);

/* Set Turbo Ratio Limits */
-	msr.lo = chip_config->turbo_ratio_limit & 0xffffffff;
-	msr.hi = (chip_config->turbo_ratio_limit >> 32) & 0xffffffff;
-	wrmsr(MSR_TURBO_RATIO_LIMIT, msr);
+	if (chip_config->turbo_ratio_limit) {
+		msr.lo = chip_config->turbo_ratio_limit & 0xffffffff;
+		msr.hi = (chip_config->turbo_ratio_limit >> 32) & 0xffffffff;
+		wrmsr(MSR_TURBO_RATIO_LIMIT, msr);
+	}

/* Set Turbo Ratio Limit Cores */
-	msr.lo = chip_config->turbo_ratio_limit_cores & 0xffffffff;
-	msr.hi = (chip_config->turbo_ratio_limit_cores >> 32) & 0xffffffff;
-	wrmsr(MSR_TURBO_RATIO_LIMIT_CORES, msr);
+	if (chip_config->turbo_ratio_limit_cores) {
+		msr.lo = chip_config->turbo_ratio_limit_cores & 0xffffffff;
+		msr.hi = (chip_config->turbo_ratio_limit_cores >> 32) & 0xffffffff;
+		wrmsr(MSR_TURBO_RATIO_LIMIT_CORES, msr);
+	}

/* Set energy policy */
    msr = rdmsr(MSR_ENERGY_PERF_BIAS_CONFIG);