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[86.58.6.171]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-38f258dab74sm21637846f8f.32.2025.02.20.10.54.41 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 20 Feb 2025 10:54:42 -0800 (PST) From: Jernej =?UTF-8?B?xaBrcmFiZWM=?= To: Regis Dargent Cc: Regis Dargent , Wim Van Sebroeck , Guenter Roeck , Chen-Yu Tsai , Samuel Holland , linux-watchdog@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-sunxi@lists.linux.dev, linux-kernel@vger.kernel.org Subject: Re: [PATCH v2] watchdog: sunxi_wdt: Allow watchdog to remain enabled after probe Date: Thu, 20 Feb 2025 19:54:41 +0100 Message-ID: <3278560.vfdyTQepKt@jernej-laptop> In-Reply-To: <20250214112255.97099-2-regis.dargent@gmail.com> References: <20250214112255.97099-1-regis.dargent@gmail.com> <20250214112255.97099-2-regis.dargent@gmail.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Hi, please send new versions as separate e-mail thread. Dne petek, 14. februar 2025 ob 12:22:54 Srednjeevropski standardni =C4=8Das= je Regis Dargent napisal(a): > If the watchdog is already running during probe, let it run on, read its > configured timeout, and set its status so that it is correctly handled by= the > kernel. >=20 > Signed-off-by: Regis Dargent > --- > drivers/watchdog/sunxi_wdt.c | 48 +++++++++++++++++++++++++++++++++--- > 1 file changed, 45 insertions(+), 3 deletions(-) You should add changelog here. >=20 > diff --git a/drivers/watchdog/sunxi_wdt.c b/drivers/watchdog/sunxi_wdt.c > index b85354a99582..0094bcd063c5 100644 > --- a/drivers/watchdog/sunxi_wdt.c > +++ b/drivers/watchdog/sunxi_wdt.c > @@ -140,6 +140,7 @@ static int sunxi_wdt_set_timeout(struct watchdog_devi= ce *wdt_dev, > timeout++; > =20 > sunxi_wdt->wdt_dev.timeout =3D timeout; > + sunxi_wdt->wdt_dev.max_hw_heartbeat_ms =3D 0; > =20 > reg =3D readl(wdt_base + regs->wdt_mode); > reg &=3D ~(WDT_TIMEOUT_MASK << regs->wdt_timeout_shift); > @@ -152,6 +153,32 @@ static int sunxi_wdt_set_timeout(struct watchdog_dev= ice *wdt_dev, > return 0; > } > =20 > +static int sunxi_wdt_read_timeout(struct watchdog_device *wdt_dev) > +{ > + struct sunxi_wdt_dev *sunxi_wdt =3D watchdog_get_drvdata(wdt_dev); > + void __iomem *wdt_base =3D sunxi_wdt->wdt_base; > + const struct sunxi_wdt_reg *regs =3D sunxi_wdt->wdt_regs; > + int i; > + u32 reg; > + > + reg =3D readl(wdt_base + regs->wdt_mode); > + reg >>=3D regs->wdt_timeout_shift; > + reg &=3D WDT_TIMEOUT_MASK; > + > + /* Start at 0 which actually means 0.5s */ > + for (i =3D 0; ((i < WDT_MAX_TIMEOUT) && (wdt_timeout_map[i] !=3D reg));= i++) Drop parenthesis in condition. > + ; > + if (i =3D=3D 0) { > + wdt_dev->timeout =3D 1; > + wdt_dev->max_hw_heartbeat_ms =3D 500; > + } else { > + wdt_dev->timeout =3D i; > + wdt_dev->max_hw_heartbeat_ms =3D 0; > + } > + > + return 0; > +} > + > static int sunxi_wdt_stop(struct watchdog_device *wdt_dev) > { > struct sunxi_wdt_dev *sunxi_wdt =3D watchdog_get_drvdata(wdt_dev); > @@ -192,11 +219,22 @@ static int sunxi_wdt_start(struct watchdog_device *= wdt_dev) > return 0; > } > =20 > +static bool sunxi_wdt_enabled(struct sunxi_wdt_dev *wdt) > +{ > + u32 reg; > + void __iomem *wdt_base =3D wdt->wdt_base; > + const struct sunxi_wdt_reg *regs =3D wdt->wdt_regs; Inverse christmas tree. > + > + reg =3D readl(wdt_base + regs->wdt_mode); > + return !!(reg & WDT_MODE_EN); > +} > + > static const struct watchdog_info sunxi_wdt_info =3D { > .identity =3D DRV_NAME, > .options =3D WDIOF_SETTIMEOUT | > WDIOF_KEEPALIVEPING | > - WDIOF_MAGICCLOSE, > + WDIOF_MAGICCLOSE | > + WDIOF_SETTIMEOUT, Drop this change. WDIOF_SETTIMEOUT is already defined. > }; > =20 > static const struct watchdog_ops sunxi_wdt_ops =3D { > @@ -275,8 +313,12 @@ static int sunxi_wdt_probe(struct platform_device *p= dev) > =20 > watchdog_set_drvdata(&sunxi_wdt->wdt_dev, sunxi_wdt); > =20 > - sunxi_wdt_stop(&sunxi_wdt->wdt_dev); > - > + if (sunxi_wdt_enabled(sunxi_wdt)) { Also check for IS_ENABLED(CONFIG_WATCHDOG_HANDLE_BOOT_ENABLED). This will allow user to select behaviour via Kconfig. Best regards, Jernej > + sunxi_wdt_read_timeout(&sunxi_wdt->wdt_dev); > + set_bit(WDOG_HW_RUNNING, &sunxi_wdt->wdt_dev.status); > + } else { > + sunxi_wdt_stop(&sunxi_wdt->wdt_dev); > + } > watchdog_stop_on_reboot(&sunxi_wdt->wdt_dev); > err =3D devm_watchdog_register_device(dev, &sunxi_wdt->wdt_dev); > if (unlikely(err)) >=20