[coreboot-gerrit] Change in coreboot[master]: soc/intel/cannonlake: Clear the GPI IS & IE registers

[David Wu (Code Review)]

David Wu has uploaded this change for review. ( https://review.coreboot.org/c/coreboot/+/34624 )

Change subject: soc/intel/cannonlake: Clear the GPI IS & IE registers
......................................................................

soc/intel/cannonlake: Clear the GPI IS & IE registers

Clear the GPI Interrupt Status & Enable registers to prevent any
interrupt storms due to GPI.

BUG=b:138282962
TEST=Ensure that the Interrupt status & enable registers are reset
during the boot up when the system is brought out of G3, S5 & S3. Ensure
that the system boots fine to ChromeOS.

Change-Id: I2185355d0095601e0778b6bf47ae137cc53e4051
Signed-off-by: David Wu 
---
M src/soc/intel/cannonlake/chip.c
1 file changed, 6 insertions(+), 0 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/24/34624/1

diff --git a/src/soc/intel/cannonlake/chip.c b/src/soc/intel/cannonlake/chip.c
index 4e0dba5..fc511db 100644
--- a/src/soc/intel/cannonlake/chip.c
+++ b/src/soc/intel/cannonlake/chip.c
@@ -184,6 +184,12 @@

void soc_init_pre_device(void *chip_info)
 {
+	/*
+	 * Clear the GPI interrupt status and enable registers. These
+	 * registers do not get reset to default state when booting from S5.
+	 */
+	gpi_clear_int_cfg();
+
    /* Perform silicon specific init. */
    fsp_silicon_init(romstage_handoff_is_resume());