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[71.33.159.223]) by smtp.gmail.com with ESMTPSA id e9e14a558f8ab-3a3f3ff7b7dsm4507865ab.52.2024.10.18.08.49.12 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 18 Oct 2024 08:49:12 -0700 (PDT) From: James Hilliard To: linux-watchdog@vger.kernel.org Cc: James Hilliard , Wim Van Sebroeck , Guenter Roeck , linux-kernel@vger.kernel.org Subject: [PATCH v2] watchdog: it87_wdt: add PWRGD enable quirk for Qotom QCML04 Date: Fri, 18 Oct 2024 09:48:59 -0600 Message-Id: <20241018154859.2543595-1-james.hilliard1@gmail.com> X-Mailer: git-send-email 2.34.1 Precedence: bulk X-Mailing-List: linux-watchdog@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 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 --- Changes v1 -> v2: - remove QGLK02/IT87_WDT_BROKEN --- drivers/watchdog/it87_wdt.c | 44 +++++++++++++++++++++++++++++++++++++ 1 file changed, 44 insertions(+) diff --git a/drivers/watchdog/it87_wdt.c b/drivers/watchdog/it87_wdt.c index 3e8c15138edd..b8be9af065b2 100644 --- a/drivers/watchdog/it87_wdt.c +++ b/drivers/watchdog/it87_wdt.c @@ -20,6 +20,7 @@ #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt +#include #include #include #include @@ -40,6 +41,7 @@ #define VAL 0x2f /* Logical device Numbers LDN */ +#define EC 0x04 #define GPIO 0x07 /* Configuration Registers and Functions */ @@ -73,6 +75,12 @@ #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 +248,20 @@ 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 it8786_quirks[] = { + { + /* Qotom Q30900P */ + .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 +283,10 @@ 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 +297,17 @@ static int __init it87_wdt_init(void) chip_rev = superio_inb(CHIPREV) & 0x0f; superio_exit(); + switch (chip_type) { + case IT8786_ID: + dmi_id = dmi_first_match(it8786_quirks); + break; + default: + dmi_id = NULL; + } + + if (dmi_id) + quirks = (long)dmi_id->driver_data; + switch (chip_type) { case IT8702_ID: max_units = 255; @@ -333,6 +368,15 @@ 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) {