[XS] Change in coreboot[main]: soc/mediatek/mt8196: Fix issue of RTC recovery failed

[Jarried Lin (Code Review)]

Jarried Lin has uploaded this change for review. ( https://review.coreboot.org/c/coreboot/+/86353?usp=email )

Change subject: soc/mediatek/mt8196: Fix issue of RTC recovery failed
......................................................................

soc/mediatek/mt8196: Fix issue of RTC recovery failed

Config pmic register 0x50c bit0 which decide whether use external xtal,
this bit of mt6685 should be set to 1, which means without external
xtal.

BRANCH=rauru
BUG=b:395485005
TEST=emerge-rauru coreboot chromeos-bootimage, remove battery and
charge, then insert battery and charge, rtc will boot normally

Signed-off-by: Shunxi Zhang 
Change-Id: Iea44f13af030f24c02993dd43a35a9d8b4f72179
---
M src/soc/mediatek/mt8196/mt6685_rtc.c
1 file changed, 4 insertions(+), 0 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/53/86353/1

diff --git a/src/soc/mediatek/mt8196/mt6685_rtc.c b/src/soc/mediatek/mt8196/mt6685_rtc.c
index 4564a31..4e63f10 100644
--- a/src/soc/mediatek/mt8196/mt6685_rtc.c
+++ b/src/soc/mediatek/mt8196/mt6685_rtc.c
@@ -345,6 +345,10 @@
 {
    printk(BIOS_INFO, "%s: enter\n", __func__);

+	config_interface(SCK_TOP_XTAL_SEL_ADDR, 1, SCK_TOP_XTAL_SEL_MASK,
+			 SCK_TOP_XTAL_SEL_SHIFT);
+	udelay(100);
+
    if (!retry(RECOVERY_RETRY_COUNT,
    	   rtc_frequency_meter_check() &&
    	   rtc_init_after_recovery())) {