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bh=zt8lQ3pyBrzAtax8igYb17d+ZOwQEn1FpWIt7R4TXd4=; b=DHFbXVz5ap6/m0ye4PVYmP2m9l jRuCY6sl5St2n2z7VzTjbRxPHgGrYMZO6+Us1ucuwW22ZTVbcvjKlNM+HG7AQc14O3mwbXK74cSwB 81yWoz9oJUtrdlCtcSuIJ32K2F/LTEHjrn2ljqfqtYmdgo1W0y98DiY6jCoQdXciSDNPNgT4/YsKz 624TMXzE37h8Ko5pt0hX+hds0BcGId1rUmMjktWxo+mB04Pulew74+3EQJ5L3ijoL1tMukeX8xygO vSeU4kb/Rz9GLuy3CQcH71J7sxGC5EViSegdd8SOUhow773lHn/PwTi6PZN4SLWwSUibJH6jL718w ZV3Ax7lg==; Received: from 108-223-40-66.lightspeed.sntcca.sbcglobal.net ([108.223.40.66]:49542 helo=server.roeck-us.net) by bh-25.webhostbox.net with esmtpsa (TLS1.2) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.100.1) (envelope-from ) id 1xLTh3-00000004JhT-48S6; Tue, 27 Oct 2026 04:31:30 +0530 Date: Mon, 26 Oct 2026 16:01:29 -0700 From: Guenter Roeck To: Artem Shimko Cc: p.zabel@pengutronix.de, Sergey.Semin@baikalelectronics.ru, mika.westerberg@linux.intel.com, andi.shyti@kernel.org, iav@iav.lv, tzungbi@kernel.org, wim@linux-watchdog.org, linux-watchdog@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH v4 2/2] watchdog: dw_wdt: manage reset line during system suspend/resume Message-ID: <4e40ea83-3ba1-4e2d-aa38-31313b367e78@roeck-us.net> References: <20261024140854.25664-1-a.shimko.dev@gmail.com> <20261024140854.25664-3-a.shimko.dev@gmail.com> X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20261024140854.25664-3-a.shimko.dev@gmail.com> X-AntiAbuse: This header was added to track abuse, please include it with any abuse report X-AntiAbuse: Primary Hostname - bh-25.webhostbox.net X-AntiAbuse: Original Domain - vger.kernel.org X-AntiAbuse: Originator/Caller UID/GID - [47 12] / [47 12] X-AntiAbuse: Sender Address Domain - roeck-us.net X-BWhitelist: no X-Source-IP: 108.223.40.66 X-Source-L: No X-Exim-ID: 1xLTh3-00000004JhT-48S6 X-Source: X-Source-Args: X-Source-Dir: X-Source-Sender: 108-223-40-66.lightspeed.sntcca.sbcglobal.net (server.roeck-us.net) [108.223.40.66]:49542 X-Source-Auth: guenter@roeck-us.net X-Email-Count: 12 X-Org: HG=direseller_whb_net_legacy;ORG=directi; X-Source-Cap: cm9lY2s7YWN0aXZzdG07YmgtMjUud2ViaG9zdGJveC5uZXQ= X-Local-Domain: yes X-CMAE-Envelope: MS4xfCM+o34IB1hlbcXmSjcJarNor8hIxQ8aLK7f4HkWa0KcU9sEIjf3mrmP7/4G2U5bGPiDOOWbUry3LVrp0gTEUxc3kIs8gweaqdOnFVV6/Fs/COFI06Uf PlS+RHLlBvO/MC4b720ucv2a2QMCPYKwA0pBwHmaM3SpojwGlUrNfB//Vm8D7Cbn3BIJcGRb/LzrqwTvbM+G+xGgBrix/to4xfYphCpXWxrrf/aCZ2U5m/nY On Sat, Oct 24, 2026 at 05:08:51PM +0300, Artem Shimko wrote: > The watchdog controller reset line is not currently managed during system > suspend/resume. This can lead to an inconsistent hardware state when > resuming from suspend, as the controller may not be properly reinitialized. > > Assert the reset line before disabling clocks during suspend to ensure > the controller is held in reset while power is gated. During resume, > deassert the reset after clocks are enabled and before restoring register > state to guarantee the controller is properly initialized. > > Tested-by: Igor Velkov > Reviewed-by: Tzung-Bi Shih > Signed-off-by: Artem Shimko Applied. Thanks, Guenter