[PATCH AUTOSEL 4.19 20/23] watchdog: it87_wdt: Keep WDTCTRL bit 3 unmodified for IT8784/IT8786

[Sasha Levin <sashal@kernel.org>]

From: Werner Fischer <devlists@wefi.net>

[ Upstream commit d12971849d71781c1e4ffd1117d4878ce233d319 ]

WDTCTRL bit 3 sets the mode choice for the clock input of IT8784/IT8786.
Some motherboards require this bit to be set to 1 (= PCICLK mode),
otherwise the watchdog functionality gets broken. The BIOS of those
motherboards sets WDTCTRL bit 3 already to 1.

Instead of setting all bits of WDTCTRL to 0 by writing 0x00 to it, keep
bit 3 of it unchanged for IT8784/IT8786 chips. In this way, bit 3 keeps
the status as set by the BIOS of the motherboard.

Watchdog tests have been successful with this patch with the following
systems:
  IT8784: Thomas-Krenn LES plus v2 (YANLING YL-KBRL2 V2)
  IT8786: Thomas-Krenn LES plus v3 (YANLING YL-CLU L2)
  IT8786: Thomas-Krenn LES network 6L v2 (YANLING YL-CLU6L)

Link: https://lore.kernel.org/all/140b264d-341f-465b-8715-dacfe84b3f71@roeck-us.net/

Signed-off-by: Werner Fischer <devlists@wefi.net>
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Link: https://lore.kernel.org/r/20231213094525.11849-4-devlists@wefi.net
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Wim Van Sebroeck <wim@linux-watchdog.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/watchdog/it87_wdt.c | 14 +++++++++++++-
 1 file changed, 13 insertions(+), 1 deletion(-)

diff --git a/drivers/watchdog/it87_wdt.c b/drivers/watchdog/it87_wdt.c
index e96faea24925..d77e9dc0bd45 100644
--- a/drivers/watchdog/it87_wdt.c
+++ b/drivers/watchdog/it87_wdt.c
@@ -269,6 +269,7 @@ static struct watchdog_device wdt_dev = {
 static int __init it87_wdt_init(void)
 {
 	u8  chip_rev;
+	u8 ctrl;
 	int rc;
 
 	rc = superio_enter();
@@ -324,7 +325,18 @@ static int __init it87_wdt_init(void)
 
 	superio_select(GPIO);
 	superio_outb(WDT_TOV1, WDTCFG);
-	superio_outb(0x00, WDTCTRL);
+
+	switch (chip_type) {
+	case IT8784_ID:
+	case IT8786_ID:
+		ctrl = superio_inb(WDTCTRL);
+		ctrl &= 0x08;
+		superio_outb(ctrl, WDTCTRL);
+		break;
+	default:
+		superio_outb(0x00, WDTCTRL);
+	}
+
 	superio_exit();
 
 	if (timeout < 1 || timeout > max_units * 60) {
-- 
2.43.0