[coreboot-gerrit] Change in coreboot[master]: soc/intel/xeon_sp: Lock down DMICTL

[Angel Pons (Code Review)]

Angel Pons has submitted this change. ( https://review.coreboot.org/c/coreboot/+/47449 )

Change subject: soc/intel/xeon_sp: Lock down DMICTL
......................................................................

soc/intel/xeon_sp: Lock down DMICTL

This is required for CBnT.

Change-Id: I290742c163f5f067c8d529ddca8e2d8572ab6e6a
Signed-off-by: Arthur Heymans 
Reviewed-on: https://review.coreboot.org/c/coreboot/+/47449
Reviewed-by: Christian Walter 
Reviewed-by: Angel Pons 
Tested-by: build bot (Jenkins) 
---
M src/soc/intel/xeon_sp/pch.c
1 file changed, 3 insertions(+), 0 deletions(-)

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

diff --git a/src/soc/intel/xeon_sp/pch.c b/src/soc/intel/xeon_sp/pch.c
index 5427952..2b35223 100644
--- a/src/soc/intel/xeon_sp/pch.c
+++ b/src/soc/intel/xeon_sp/pch.c
@@ -39,6 +39,9 @@
    reg32 = (0x3f << 18) | ACPI_BASE_ADDRESS | 1;
    pcr_write32(PID_DMI, PCR_DMI_ACPIBA, reg32);
    pcr_write32(PID_DMI, PCR_DMI_ACPIBDID, 0x23a8);
+
+	reg32 = pcr_read32(PID_DMI, PCR_DMI_DMICTL);
+	pcr_write32(PID_DMI, PCR_DMI_DMICTL, reg32 | PCR_DMI_DMICTL_SRLOCK);
 }

void bootblock_pch_init(void)