linux-kernel - [PATCH v4] watchdog: it87_wdt: add PWRGD enable quirk for Qotom QCML04

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Message-Id: <20241025063441.3494837-1-james.hilliard1@gmail.com>
Date: Fri, 25 Oct 2024 00:34:40 -0600
From: James Hilliard <james.hilliard1@...il.com>
To: linux-watchdog@...r.kernel.org
Cc: James Hilliard <james.hilliard1@...il.com>,
	Guenter Roeck <linux@...ck-us.net>,
	Wim Van Sebroeck <wim@...ux-watchdog.org>,
	linux-kernel@...r.kernel.org
Subject: [PATCH v4] watchdog: it87_wdt: add PWRGD enable quirk for Qotom QCML04

For the watchdog timer to work properly on the QCML04 board we need to
set PWRGD enable in the Environment Controller Configuration Registers
Special Configuration Register 1 when it is not already set, this may
be the case when the watchdog is not enabled from within the BIOS.

Signed-off-by: James Hilliard <james.hilliard1@...il.com>
Reviewed-by: Guenter Roeck <linux@...ck-us.net>
---
Changes v3 -> v4:
  - NULL terminate it87_quirks table
Changes v2 -> v3:
  - add linux/bits.h header
  - check for quirks on all it87 chips
Changes v1 -> v2:
  - remove QGLK02/IT87_WDT_BROKEN
---
 drivers/watchdog/it87_wdt.c | 39 +++++++++++++++++++++++++++++++++++++
 1 file changed, 39 insertions(+)

diff --git a/drivers/watchdog/it87_wdt.c b/drivers/watchdog/it87_wdt.c
index 3e8c15138edd..1a5a0a2c3f2e 100644
--- a/drivers/watchdog/it87_wdt.c
+++ b/drivers/watchdog/it87_wdt.c
@@ -20,6 +20,8 @@
 
 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
 
+#include <linux/bits.h>
+#include <linux/dmi.h>
 #include <linux/init.h>
 #include <linux/io.h>
 #include <linux/kernel.h>
@@ -40,6 +42,7 @@
 #define VAL		0x2f
 
 /* Logical device Numbers LDN */
+#define EC		0x04
 #define GPIO		0x07
 
 /* Configuration Registers and Functions */
@@ -73,6 +76,12 @@
 #define IT8784_ID	0x8784
 #define IT8786_ID	0x8786
 
+/* Environment Controller Configuration Registers LDN=0x04 */
+#define SCR1		0xfa
+
+/* Environment Controller Bits SCR1 */
+#define WDT_PWRGD	0x20
+
 /* GPIO Configuration Registers LDN=0x07 */
 #define WDTCTRL		0x71
 #define WDTCFG		0x72
@@ -240,6 +249,21 @@ static int wdt_set_timeout(struct watchdog_device *wdd, unsigned int t)
 	return ret;
 }
 
+enum {
+	IT87_WDT_OUTPUT_THROUGH_PWRGD	= BIT(0),
+};
+
+static const struct dmi_system_id it87_quirks[] = {
+	{
+		/* Qotom Q30900P (IT8786) */
+		.matches = {
+			DMI_EXACT_MATCH(DMI_BOARD_NAME, "QCML04"),
+		},
+		.driver_data = (void *)IT87_WDT_OUTPUT_THROUGH_PWRGD,
+	},
+	{}
+};
+
 static const struct watchdog_info ident = {
 	.options = WDIOF_SETTIMEOUT | WDIOF_MAGICCLOSE | WDIOF_KEEPALIVEPING,
 	.firmware_version = 1,
@@ -261,8 +285,10 @@ static struct watchdog_device wdt_dev = {
 
 static int __init it87_wdt_init(void)
 {
+	const struct dmi_system_id *dmi_id;
 	u8  chip_rev;
 	u8 ctrl;
+	int quirks = 0;
 	int rc;
 
 	rc = superio_enter();
@@ -273,6 +299,10 @@ static int __init it87_wdt_init(void)
 	chip_rev  = superio_inb(CHIPREV) & 0x0f;
 	superio_exit();
 
+	dmi_id = dmi_first_match(it87_quirks);
+	if (dmi_id)
+		quirks = (long)dmi_id->driver_data;
+
 	switch (chip_type) {
 	case IT8702_ID:
 		max_units = 255;
@@ -333,6 +363,15 @@ static int __init it87_wdt_init(void)
 		superio_outb(0x00, WDTCTRL);
 	}
 
+	if (quirks & IT87_WDT_OUTPUT_THROUGH_PWRGD) {
+		superio_select(EC);
+		ctrl = superio_inb(SCR1);
+		if (!(ctrl & WDT_PWRGD)) {
+			ctrl |= WDT_PWRGD;
+			superio_outb(ctrl, SCR1);
+		}
+	}
+
 	superio_exit();
 
 	if (timeout < 1 || timeout > max_units * 60) {
-- 
2.34.1