watchdog: it87_wdt: Keep WDTCTRL bit 3 unmodified for IT8784/IT8786

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>

diff --git a/drivers/watchdog/it87_wdt.c b/drivers/watchdog/it87_wdt.c
index f6a344c002afe13bab98c41b712f0ceb1fd88bf1..9297a5891912748562f49921a7ff7dd925550304 100644 (file)
--- a/drivers/watchdog/it87_wdt.c
+++ b/drivers/watchdog/it87_wdt.c
@@ -258,6 +258,7 @@ static struct watchdog_device wdt_dev = {
 static int __init it87_wdt_init(void)
 {
        u8  chip_rev;
+       u8 ctrl;
        int rc;
 
        rc = superio_enter();
@@ -316,7 +317,18 @@ 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) {