soc/mediatek: Flush cache before triggering EC reset
There will be no log in 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 <rex-bc.chen@mediatek.com>
Change-Id: I1bd900beb4cc84f7121c5fb66907fa73b62517fa
Reviewed-on: https://review.coreboot.org/c/coreboot/+/59683
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Yu-Ping Wu <yupingso@google.com>
diff --git a/src/soc/mediatek/common/wdt.c b/src/soc/mediatek/common/wdt.c
index f06fbf0..6e1b761 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, clean the data cache so the logs in cbmem
+ * console (either in SRAM or DRAM) can be flushed.
*/
+ 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)