Change in coreboot[master]: soc/intel/skylake: Do not let FSP set the subsystem IDs

[Patrick Georgi (Code Review)]

Patrick Georgi has submitted this change. ( https://review.coreboot.org/c/coreboot/+/45006 )

Change subject: soc/intel/skylake: Do not let FSP set the subsystem IDs
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soc/intel/skylake: Do not let FSP set the subsystem IDs

The subsystem ID registers are read/write-once. Writes by coreboot will
not take effect if FSP sets them.

Note that FSP sets one device ID for the SA devices and another for PCH
devices. coreboot will copy individual vendor and device IDs if
subsystem is not provided.

Change-Id: I9157fb69f2a49dfc08f049da4b39fbf86614ace3
Signed-off-by: Benjamin Doron 
Reviewed-on: https://review.coreboot.org/c/coreboot/+/45006
Tested-by: build bot (Jenkins) 
Reviewed-by: Nico Huber 
Reviewed-by: Angel Pons 
---
M src/soc/intel/skylake/chip.c
1 file changed, 5 insertions(+), 10 deletions(-)

Approvals:
  build bot (Jenkins): Verified
  Nico Huber: Looks good to me, approved
  Angel Pons: Looks good to me, approved

diff --git a/src/soc/intel/skylake/chip.c b/src/soc/intel/skylake/chip.c
index 549f403..89eaef5 100644
--- a/src/soc/intel/skylake/chip.c
+++ b/src/soc/intel/skylake/chip.c
@@ -320,16 +320,11 @@
    	 */
    	params->SpiFlashCfgLockDown = 0;
    }
-	/* only replacing preexisting subsys ID defaults when non-zero */
-	if (CONFIG_SUBSYSTEM_VENDOR_ID != 0) {
-		params->DefaultSvid = CONFIG_SUBSYSTEM_VENDOR_ID;
-		params->PchSubSystemVendorId = CONFIG_SUBSYSTEM_VENDOR_ID;
-	}
-
-	if (CONFIG_SUBSYSTEM_DEVICE_ID != 0) {
-		params->DefaultSid = CONFIG_SUBSYSTEM_DEVICE_ID;
-		params->PchSubSystemId = CONFIG_SUBSYSTEM_DEVICE_ID;
-	}
+	/* FSP should let coreboot set subsystem IDs, which are read/write-once */
+	params->DefaultSvid = 0;
+	params->PchSubSystemVendorId = 0;
+	params->DefaultSid = 0;
+	params->PchSubSystemId = 0;

params->PchPmWolEnableOverride = config->WakeConfigWolEnableOverride;
    params->PchPmPcieWakeFromDeepSx = config->WakeConfigPcieWakeFromDeepSx;