Change in coreboot[master]: mb/google/nipperkin: Fix WLAN to GEN2 speed

[Rob Barnes (Code Review)]

Rob Barnes has uploaded this change for review. ( https://review.coreboot.org/c/coreboot/+/63722 )

Change subject: mb/google/nipperkin: Fix WLAN to GEN2 speed
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mb/google/nipperkin: Fix WLAN to GEN2 speed

Fix WLAN PCIE speed to GEN2. Dynamic switching between speeds is causing
hangs during S0ix suspend. Just disabling PSPP causes poor PLT performance.

BUG=b:228830362
BRANCH=guybrush
TEST=suspend_stress_test on AC and DC

Change-Id: I988365e51aca0d6515c5605b3032521cf59d8d30
Signed-off-by: Rob Barnes 
---
M src/mainboard/google/guybrush/variants/nipperkin/variant.c
1 file changed, 7 insertions(+), 3 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/22/63722/1

diff --git a/src/mainboard/google/guybrush/variants/nipperkin/variant.c b/src/mainboard/google/guybrush/variants/nipperkin/variant.c
index b70545e..cb79fc0 100644
--- a/src/mainboard/google/guybrush/variants/nipperkin/variant.c
+++ b/src/mainboard/google/guybrush/variants/nipperkin/variant.c
@@ -7,7 +7,11 @@
 {
    dxio_descriptors[WLAN].link_aspm_L1_1 = false;
    dxio_descriptors[WLAN].link_aspm_L1_2 = false;
-	/* Disable PSPP to avoid S0ix hangs - b/228830362 */
-	memset(dxio_descriptors[WLAN].port_params, 0,
-	       sizeof(dxio_descriptors[WLAN].port_params));
+
+	/* Fix link speed to GEN2 - b/228830362 */
+	dxio_descriptors[WLAN].link_speed_capability = GEN2;
+	dxio_descriptors[WLAN].port_params[0] = PP_PSPP_AC;
+	dxio_descriptors[WLAN].port_params[1] = 0x122;
+	dxio_descriptors[WLAN].port_params[2] = PP_PSPP_DC;
+	dxio_descriptors[WLAN].port_params[3] = 0x122;
 }