Change in coreboot[master]: soc/mediatek: Only update required bits when triggering WDT reset

[Hung-Te Lin (Code Review)]

Hung-Te Lin has submitted this change. ( https://review.coreboot.org/c/coreboot/+/61729 )

Change subject: soc/mediatek: Only update required bits when triggering WDT reset
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soc/mediatek: Only update required bits when triggering WDT reset

To prevent to modify original value of wdt_mode, we use setbits32 to
update required bits.

BUG=b:218420108
TEST=build pass

Signed-off-by: Rex-BC Chen 
Change-Id: I743c1af3583c18ec8500fc1eb89f31cdbce5317c
Reviewed-on: https://review.coreboot.org/c/coreboot/+/61729
Reviewed-by: Yu-Ping Wu 
Tested-by: build bot (Jenkins) 
---
M src/soc/mediatek/common/wdt.c
1 file changed, 1 insertion(+), 1 deletion(-)

Approvals:
  build bot (Jenkins): Verified
  Yu-Ping Wu: Looks good to me, approved
  Rex-BC Chen: Looks good to me, but someone else must approve

diff --git a/src/soc/mediatek/common/wdt.c b/src/soc/mediatek/common/wdt.c
index 587e50f..4f8eff2 100644
--- a/src/soc/mediatek/common/wdt.c
+++ b/src/soc/mediatek/common/wdt.c
@@ -32,7 +32,7 @@
    	 * 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);
+		setbits32(&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");