From: Sasha Levin <sashal@kernel.org>
To: linux-kernel@vger.kernel.org, stable@vger.kernel.org
Cc: Werner Fischer <devlists@wefi.net>,
Guenter Roeck <linux@roeck-us.net>,
Wim Van Sebroeck <wim@linux-watchdog.org>,
Sasha Levin <sashal@kernel.org>,
linux-watchdog@vger.kernel.org
Subject: [PATCH AUTOSEL 4.19 20/23] watchdog: it87_wdt: Keep WDTCTRL bit 3 unmodified for IT8784/IT8786
Date: Mon, 22 Jan 2024 10:18:00 -0500 [thread overview]
Message-ID: <20240122151823.997644-20-sashal@kernel.org> (raw)
In-Reply-To: <20240122151823.997644-1-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
parent reply other threads:[~2024-01-22 15:19 UTC|newest]
Thread overview: expand[flat|nested] mbox.gz Atom feed
[parent not found: <20240122151823.997644-1-sashal@kernel.org>]
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