soc/intel/tigerlake: Update Cpu Ratio settings

Add config to override CpuRatio or setting CpuRatio to
allowed maximum processor non-turbo ratio.

BUG=151175469
BRANCH=none
TEST=Build and boot tglrvp and observe there is no extra reset
in meminit.

Signed-off-by: Srinidhi N Kaushik <srinidhi.n.kaushik@intel.com>
Change-Id: I2fa883b443d0a4c77d62275faeacd1ed2c67a97c
Reviewed-on: https://review.coreboot.org/c/coreboot/+/39493
Reviewed-by: Wonkyu Kim <wonkyu.kim@intel.com>
Reviewed-by: Nick Vaccaro <nvaccaro@google.com>
Reviewed-by: Caveh Jalali <caveh@chromium.org>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

1 files changed, 12 insertions, 0 deletions

diff --git a/src/soc/intel/tigerlake/chip.h b/src/soc/intel/tigerlake/chip.h
index 9fc70f8a46..5e010bda59 100644
--- a/src/soc/intel/tigerlake/chip.h
+++ b/src/soc/intel/tigerlake/chip.h
@@ -285,6 +285,18 @@ struct soc_intel_tigerlake_config {
 	 * This mode makes FSP detect Optane and NVME and set PCIe lane mode
 	 * accordingly */
 	uint8_t HybridStorageMode;
+
+	/*
+	 * Override CPU flex ratio value:
+	 * CPU ratio value controls the maximum processor non-turbo ratio.
+	 * Valid Range 0 to 63.
+	 * In general descriptor provides option to set default cpu flex ratio.
+	 * Default cpu flex ratio 0 ensures booting with non-turbo max frequency.
+	 * That's the reason FSP skips cpu_ratio override if cpu_ratio is 0.
+	 * Only override CPU flex ratio to not boot with non-turbo max.
+	 */
+	uint8_t cpu_ratio_override;
+
 };
 
 typedef struct soc_intel_tigerlake_config config_t;