soc/intel/tigerlake: Hook up SATA Port Enable DITO UPDs

SataPortsEnableDitoConfig Enable DEVSLP Idle Timeout settings DmVal and
DitoVal. SataPortsDmVal and SataPortsDitoVal helps to determine when to
enter Device Sleep. Device Sleep enables the host bus adapter (HBA) to
assert the DEVSLP signal as soon as there are no commands outstanding
to the device and the port specific Device Sleep idle timer has expired.
Device Sleep Idle Timeout values (PxDEVSLP.DITO and PxDEVSLP.DM) are
port specific timeout values used by the HBA for determining when to
assert the DEVSLP signal. They provides a mechanism for the HBA to apply
a programmable amount of hysteresis so as to prevent the HBA from
asserting the DEVSLP signal too quickly which may result in undesirable
latencies. This patch is created based on Intel Tiger Lake Processor
PCH Datasheet with Document number:575857 and Chapter number:12.

* PxDEVSLP.DM ->     SataPortsDmVal: Enable SATA Port DmVal DITO multiplier.
 Default is 15.
* PxDEVSLP.DITO -> SataPortsDitoVal: Enable SATA Port DmVal DEVSLP Idle Timeout
 (DITO), Default is 625ms.

BUG=b:151163106
BRANCH=None
TEST=Build and boot volteer and TGL RVP.

Signed-off-by: Shaunak Saha <shaunak.saha@intel.com>
Change-Id: I6a824524738a9e0609f54bea9d892b4a42a1d3db
Reviewed-on: https://review.coreboot.org/c/coreboot/+/42214
Reviewed-by: Wonkyu Kim <wonkyu.kim@intel.com>
Reviewed-by: Caveh Jalali <caveh@chromium.org>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

1 files changed, 24 insertions, 0 deletions

diff --git a/src/soc/intel/tigerlake/fsp_params.c b/src/soc/intel/tigerlake/fsp_params.c
index 3187a33eaf..798c16a425 100644
--- a/src/soc/intel/tigerlake/fsp_params.c
+++ b/src/soc/intel/tigerlake/fsp_params.c
@@ -24,6 +24,10 @@
 #define THC_0		1
 #define THC_1		2
 
+/* SATA DEVSLP idle timeout default values */
+#define DEF_DMVAL	15
+#define DEF_DITOVAL	625
+
 /*
  * Chip config parameter PcieRpL1Substates uses (UPD value + 1)
  * because UPD value of 0 for PcieRpL1Substates means disabled for FSP.
@@ -212,6 +216,26 @@ void platform_fsp_silicon_init_params_cb(FSPS_UPD *supd)
 	params->PchPwrOptEnable = !(config->DmiPwrOptimizeDisable);
 	params->SataPwrOptEnable = !(config->SataPwrOptimizeDisable);
 
+	/*
+	 *  Enable DEVSLP Idle Timeout settings DmVal and DitoVal.
+	 *  SataPortsDmVal is the DITO multiplier. Default is 15.
+	 *  SataPortsDitoVal is the DEVSLP Idle Timeout (DITO), Default is 625ms.
+	 *  The default values can be changed from devicetree.
+	 */
+	for (i = 0; i < ARRAY_SIZE(config->SataPortsEnableDitoConfig); i++) {
+		if (config->SataPortsEnableDitoConfig[i]) {
+			if (config->SataPortsDmVal[i])
+				params->SataPortsDmVal[i] = config->SataPortsDmVal[i];
+			else
+				params->SataPortsDmVal[i] = DEF_DMVAL;
+
+			if (config->SataPortsDitoVal[i])
+				params->SataPortsDitoVal[i] = config->SataPortsDitoVal[i];
+			else
+				params->SataPortsDitoVal[i] = DEF_DITOVAL;
+		}
+	}
+
 	/* Enable TCPU for processor thermal control */
 	params->Device4Enable = config->Device4Enable;