soc/intel/alderlake: Enable Intel FIVR RFI settings
Add RFI UPD settings to mitigate RFI noise issues and exporting
these UPDs to override via board devicetree.
BUG=b:200886627
TEST=build
Change-Id: I37bfef295fcd886d4f01abd40f9467a0791e9e34
Signed-off-by: Wisley Chen <wisley.chen@quanta.corp-partner.google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/58878
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Tim Wawrzynczak <twawrzynczak@chromium.org>
diff --git a/src/soc/intel/alderlake/chip.h b/src/soc/intel/alderlake/chip.h
index 699626b..d259442 100644
--- a/src/soc/intel/alderlake/chip.h
+++ b/src/soc/intel/alderlake/chip.h
@@ -135,6 +135,22 @@
| LPM_S0i3_0 | LPM_S0i3_1 | LPM_S0i3_2 | LPM_S0i3_3 | LPM_S0i3_4,
};
+/*
+ * FivrSpreadSpectrum:
+ * Values
+ * 0 - 0.5%, 3 - 1%, 8 - 1.5%, 18 - 2%, 28 - 3%, 34 - 4%, 39 - 5%, 44 - 6%
+ */
+enum fivr_spread_spectrum_ratio {
+ FIVR_SS_0_5 = 0,
+ FIVR_SS_1 = 3,
+ FIVR_SS_1_5 = 8,
+ FIVR_SS_2 = 18,
+ FIVR_SS_3 = 28,
+ FIVR_SS_4 = 34,
+ FIVR_SS_5 = 39,
+ FIVR_SS_6 = 44,
+};
+
struct soc_intel_alderlake_config {
/* Common struct containing soc config data required by common code */
@@ -495,6 +511,23 @@
/* Platform Power Pmax */
uint16_t PsysPmax;
+ /*
+ * FivrRfiFrequency
+ * PCODE MMIO Mailbox: Set the desired RFI frequency, in increments of 100KHz.
+ * 0: Auto
+ * Range varies based on XTAL clock:
+ * 0-1918*100 KHz (Up to 191.8MHz) for 24MHz clock
+ * 0-1535*100 KHz (Up to 153.5MHz) for 19MHz clock
+ */
+ uint32_t FivrRfiFrequency;
+ /*
+ * FivrSpreadSpectrum
+ * Set the Spread Spectrum Range.
+ * Range: 0.5%, 1%, 1.5%, 2%, 3%, 4%, 5%, 6%.
+ * Each Range is translated to an encoded value for FIVR register.
+ * 0.5% = 0, 1% = 3, 1.5% = 8, 2% = 18, 3% = 28, 4% = 34, 5% = 39, 6% = 44.
+ */
+ uint8_t FivrSpreadSpectrum;
};
typedef struct soc_intel_alderlake_config config_t;
diff --git a/src/soc/intel/alderlake/fsp_params.c b/src/soc/intel/alderlake/fsp_params.c
index 9ed8acd..17edada 100644
--- a/src/soc/intel/alderlake/fsp_params.c
+++ b/src/soc/intel/alderlake/fsp_params.c
@@ -731,6 +731,14 @@
config->ext_fivr_settings.vnn_icc_max_ma;
}
+static void fill_fsps_fivr_rfi_params(FSP_S_CONFIG *s_cfg,
+ const struct soc_intel_alderlake_config *config)
+{
+ /* transform from Hz to 100 KHz */
+ s_cfg->FivrRfiFrequency = config->FivrRfiFrequency / (100 * KHz);
+ s_cfg->FivrSpreadSpectrum = config->FivrSpreadSpectrum;
+}
+
static void soc_silicon_init_params(FSP_S_CONFIG *s_cfg,
struct soc_intel_alderlake_config *config)
{
@@ -761,6 +769,7 @@
fill_fsps_misc_power_params,
fill_fsps_irq_params,
fill_fsps_fivr_params,
+ fill_fsps_fivr_rfi_params,
};
for (size_t i = 0; i < ARRAY_SIZE(fill_fsps_params); i++)