Change in coreboot[master]: soc/mediatek: Flush cache before triggering EC reset

[Rex-BC Chen (Code Review)]

Attention is currently required from: Hung-Te Lin.
Rex-BC Chen has uploaded this change for review. ( https://review.coreboot.org/c/coreboot/+/59683 )

Change subject: soc/mediatek: Flush cache before triggering EC reset
......................................................................

soc/mediatek: Flush cache before triggering EC reset

There will be no log on cbmem if we trigger ec reset on bootblock
stage. Therefore, call dcache_clean_all() before triggering ec
reset to flush cache to store logs on cbmem.

BUG=b:207743045
TEST=show logs on cbmem

Signed-off-by: Rex-BC Chen 
Change-Id: I1bd900beb4cc84f7121c5fb66907fa73b62517fa
---
M src/soc/mediatek/common/wdt.c
1 file changed, 4 insertions(+), 0 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/83/59683/1

diff --git a/src/soc/mediatek/common/wdt.c b/src/soc/mediatek/common/wdt.c
index f06fbf0..ce1ccc3 100644
--- a/src/soc/mediatek/common/wdt.c
+++ b/src/soc/mediatek/common/wdt.c
@@ -1,5 +1,6 @@
 /* SPDX-License-Identifier: GPL-2.0-only */

+#include <arch/cache.h>
 #include <device/mmio.h>
 #include <console/console.h>
 #include <soc/wdt.h>
@@ -27,7 +28,10 @@
    	 * 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.
+		 * Before triggering secondary reset, flushing cache first to prevent there is
+		 * log on cbmem.
    	 */
+		dcache_clean_all();
    	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)