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soc/mediatek: preserve WDT reset reason for debugging 

1. Disable external output reset signal in first WDT reset
   to preserve WDT original reset reason for WDT issue in kernel stage.
2. After preserved WDT reset reason, do fully reset again by sending
   external output reset signal.

BUG=b:194025005
TEST=boot to kernel ok and function test pass

Signed-off-by: Fengquan Chen <fengquan.chen@mediatek.corp-partner.google.com>
Change-Id: I5887a8312f4daab3cbd0a30fea0195670a932e52
Reviewed-on: https://review.coreboot.org/c/coreboot/+/57270
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Rex-BC Chen <rex-bc.chen@mediatek.corp-partner.google.com>
Reviewed-by: Hung-Te Lin <hungte@chromium.org>
Reviewed-by: Yu-Ping Wu <yupingso@google.com>
This commit is contained in:
Fengquan Chen 2021-08-25 20:01:33 +08:00 committed by Felix Held
parent 766e481adb
commit 62aa2bb784
1 changed files with 8 additions and 0 deletions
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8
src/soc/mediatek/common/wdt.c
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@ -19,6 +19,14 @@ int mtk_wdt_init(void)
if (wdt_sta & MTK_WDT_STA_HW_RST) {
printk(BIOS_INFO, "hardware watchdog\n");
mark_watchdog_tombstone();
/*
* We trigger secondary reset by triggering WDT hardware to send signal to EC.
* We do not use do_board_reset() to send signal to EC
* which is controlled by software driver.
*/
write32(&mtk_wdt->wdt_mode, MTK_WDT_MODE_EXTEN | MTK_WDT_MODE_KEY);
write32(&mtk_wdt->wdt_swrst, MTK_WDT_SWRST_KEY);
} else if (wdt_sta & MTK_WDT_STA_SW_RST)
printk(BIOS_INFO, "normal software reboot\n");
else if (wdt_sta & MTK_WDT_STA_SPM_RST)