[coreboot-gerrit] Change in coreboot[master]: mainboard/google/kahlee: support Realtek RTL8822CE WLAN

[Kevin Chiu (Code Review)]

Kevin Chiu has uploaded this change for review. ( https://review.coreboot.org/c/coreboot/+/40805 )

Change subject: mainboard/google/kahlee: support Realtek RTL8822CE WLAN
......................................................................

mainboard/google/kahlee: support Realtek RTL8822CE WLAN

gpio70 is assigned to use as WLAN rst in new schematic to fullful
RTK RTL8822CE power sequence:
WLAN rst will need to be active at least 50ms after WLAN power on.

Also in order to keep the rst low in consistency, change default gpio70
to low.

BUG=b:154357210
BRANCH=master
TEST=emerge-grunt coreboot

Change-Id: I98c8afe42b7f92016f83483acbb3b9ae64b159f7
Signed-off-by: Kevin Chiu 
---
M src/mainboard/google/kahlee/variants/baseboard/gpio.c
M src/mainboard/google/kahlee/variants/careena/variant.c
2 files changed, 8 insertions(+), 1 deletion(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/05/40805/1

diff --git a/src/mainboard/google/kahlee/variants/baseboard/gpio.c b/src/mainboard/google/kahlee/variants/baseboard/gpio.c
index 4fb60b1..e5c02d5 100644
--- a/src/mainboard/google/kahlee/variants/baseboard/gpio.c
+++ b/src/mainboard/google/kahlee/variants/baseboard/gpio.c
@@ -43,7 +43,7 @@
    PAD_GPO(GPIO_40, LOW),

/* GPIO_70 - WLAN_PE_RST_L */
-	PAD_GPO(GPIO_70, HIGH),
+	PAD_GPO(GPIO_70, LOW),

/* GPIO_74 - LPC_CLK0_EC_R */
    PAD_NF(GPIO_74, LPCCLK0, PULL_DOWN),
diff --git a/src/mainboard/google/kahlee/variants/careena/variant.c b/src/mainboard/google/kahlee/variants/careena/variant.c
index d35ec48..fb71b9f 100644
--- a/src/mainboard/google/kahlee/variants/careena/variant.c
+++ b/src/mainboard/google/kahlee/variants/careena/variant.c
@@ -16,6 +16,8 @@
 #include <ec/google/chromeec/ec.h>
 #include <baseboard/variants.h>
 #include <variant/sku.h>
+#include <gpio.h>
+#include <variant/gpio.h>

void variant_romstage_entry(int s3_resume)
 {
@@ -35,4 +37,9 @@
    		break;
    	}
    }
+
+	/* Config WLAN RST - GPIO70 PU: release RST */
+	/* From RTK RTL8822CE spec, WLAN RST needs to be active */
+	/* at least 50 ms since WLAN power on */
+	gpio_set(GPIO_70, 1);
 }