[XS] Change in coreboot[main]: mb/google/rauru: Complete PCIe reset in romstage

[Yu-Ping Wu (Code Review)]

Yu-Ping Wu has submitted this change. ( https://review.coreboot.org/c/coreboot/+/84895?usp=email )

Change subject: mb/google/rauru: Complete PCIe reset in romstage
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mb/google/rauru: Complete PCIe reset in romstage

De-assert PERST# at romstage to reduce the waiting time in ramstage.

BUG=b:361728592
TEST=The boot time improves 62ms

Change-Id: I2cd5cd59e7513b6e4036c3e8013a3c7322d2f787
Signed-off-by: Yidi Lin 
Reviewed-on: https://review.coreboot.org/c/coreboot/+/84895
Tested-by: build bot (Jenkins) 
Reviewed-by: Yu-Ping Wu 
Reviewed-by: Yidi Lin 
---
M src/mainboard/google/rauru/romstage.c
M src/soc/mediatek/mt8196/Makefile.mk
2 files changed, 5 insertions(+), 0 deletions(-)

Approvals:
  Yu-Ping Wu: Looks good to me, approved
  build bot (Jenkins): Verified
  Yidi Lin: Looks good to me, approved

diff --git a/src/mainboard/google/rauru/romstage.c b/src/mainboard/google/rauru/romstage.c
index 0db6fd2..7ee8759 100644
--- a/src/mainboard/google/rauru/romstage.c
+++ b/src/mainboard/google/rauru/romstage.c
@@ -1,8 +1,12 @@
 /* SPDX-License-Identifier: GPL-2.0-only */

#include <arch/stages.h>
+#include <soc/pcie.h>

void platform_romstage_main(void)
 {
    /* TODO: add romstage main function */
+
+	if (CONFIG(PCI))
+		mtk_pcie_deassert_perst();
 }
diff --git a/src/soc/mediatek/mt8196/Makefile.mk b/src/soc/mediatek/mt8196/Makefile.mk
index df72ba6..809f3dc 100644
--- a/src/soc/mediatek/mt8196/Makefile.mk
+++ b/src/soc/mediatek/mt8196/Makefile.mk
@@ -16,6 +16,7 @@
 bootblock-y += ../common/wdt.c ../common/wdt_req.c wdt.c

romstage-y += ../common/cbmem.c
+romstage-$(CONFIG_PCI) += ../common/early_init.c ../common/pcie.c
 romstage-y += emi.c
 romstage-y += l2c_ops.c
 romstage-y += ../common/mmu_operations.c ../common/mmu_cmops.c