Tim Wawrzynczak submitted this change.
soc/intel/tigerlake: Set FSPS UPD ITbtConnectTopologyTimeoutInMs
The Connect Topology Command(CNTP) is sent with default timeout value
(0x1388) along with FW CM. The CNTP is supposed to be skipped while
using SW CM. While transition from FW CM to SW CM, the default timeout
value could cause boot time delay up to ~10 seconds. Set this FSPS UPD
ITbtConnectTopologyTimeoutInMs to be 0 in order to avoid the 10 seconds
delay. Future FSP release will evaluate this ITbtConnectTopologyTimeoutInMs
value. While FSP finds this UPD value being 0, FSP will skip sending CNTP.
BUG=b:155893566
TEST=Built image with SW CM Thunderbolt firmware and verified no
outstanding delay time while using FSP v3197 during boot to kernel.
Signed-off-by: John Zhao <john.zhao@intel.com>
Change-Id: I47e3519fd818cb56e6abd16464d8370ffddabc5b
Reviewed-on: https://review.coreboot.org/c/coreboot/+/42056
Reviewed-by: Caveh Jalali <caveh@chromium.org>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
---
M src/soc/intel/tigerlake/chip.h
M src/soc/intel/tigerlake/fsp_params.c
2 files changed, 10 insertions(+), 0 deletions(-)
diff --git a/src/soc/intel/tigerlake/chip.h b/src/soc/intel/tigerlake/chip.h
index ed09aaa..e693699 100644
--- a/src/soc/intel/tigerlake/chip.h
+++ b/src/soc/intel/tigerlake/chip.h
@@ -238,6 +238,9 @@
*/
uint16_t TcssAuxOri;
+ /* Connect Topology Command timeout value */
+ uint16_t ITbtConnectTopologyTimeoutInMs;
+
/*
* Override GPIO PM configuration:
* 0: Use FSP default GPIO PM program,
diff --git a/src/soc/intel/tigerlake/fsp_params.c b/src/soc/intel/tigerlake/fsp_params.c
index bdcd357..926d8eb 100644
--- a/src/soc/intel/tigerlake/fsp_params.c
+++ b/src/soc/intel/tigerlake/fsp_params.c
@@ -114,6 +114,13 @@
for (i = 0; i < 8; i++)
params->IomTypeCPortPadCfg[i] = config->IomTypeCPortPadCfg[i];
+ /*
+ * Set FSPS UPD ITbtConnectTopologyTimeoutInMs with value 0. FSP will
+ * evaluate this UPD value and skip sending command. There will be no
+ * delay for command completion.
+ */
+ params->ITbtConnectTopologyTimeoutInMs = 0;
+
/* Chipset Lockdown */
if (get_lockdown_config() == CHIPSET_LOCKDOWN_COREBOOT) {
params->PchLockDownGlobalSmi = 0;
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