From patchwork Mon Sep 2 13:23:58 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Claudiu Beznea X-Patchwork-Id: 13787290 Received: from mail-ej1-f46.google.com (mail-ej1-f46.google.com [209.85.218.46]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 25667201269 for ; Mon, 2 Sep 2024 13:24:16 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.218.46 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1725283459; cv=none; b=MROZCjdav3UO7QqIdLbggvfBQllGOq2mEja3AFWU7c5I4ILlmLYyAsyAoz2eRk/Lxf9d0jaQ3OQOLlcNyERu6ywtJnVa698JlMQIyzRrZiLmFOcewroNSeupR8RxuObLSQt1rcJBHqqyB24E46MRFwFDl3qmx0ITrypkm2ClXHA= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1725283459; c=relaxed/simple; bh=Abxa8BkfsJuLjrDSm+JLHl1KZHPfBQ7Y/v/znoZjjdM=; h=From:To:Cc:Subject:Date:Message-Id:MIME-Version; b=JyftQULoxL1Bpku9mVALsdWcvz7ERZUKBugexTGVUbpq+PFfFqcGpYhZjyFtl5PZny3NSZZJiOPBaWMNxI8rCavPRQ3jbSEmgv0XaoMumqSCdJ6Ry6DElo2IUxbFiOLPrGT8434wpnouw1zGuz/yH/gdd9J30tEV3pV4nEPr6cI= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=tuxon.dev; spf=pass smtp.mailfrom=tuxon.dev; dkim=pass (2048-bit key) header.d=tuxon.dev header.i=@tuxon.dev header.b=LmjjR7U3; arc=none smtp.client-ip=209.85.218.46 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=tuxon.dev Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=tuxon.dev Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=tuxon.dev header.i=@tuxon.dev header.b="LmjjR7U3" Received: by mail-ej1-f46.google.com with SMTP id a640c23a62f3a-a86b46c4831so471052966b.1 for ; Mon, 02 Sep 2024 06:24:16 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=tuxon.dev; s=google; t=1725283455; x=1725888255; darn=vger.kernel.org; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:from:to:cc:subject:date:message-id:reply-to; bh=B2OrY7LmS5ARPSvD7Xeqfyw/hCUAImQblS8V1N5kgNU=; b=LmjjR7U3F9OKRrrq8tatiKAwO2QEiPY76JqPdLHfcOGML35uuFYi+cfYLHkKMafEyC Lwr7hKyD8mvcYeXibt5oL3Q+eQKGrhtNLUDJp9dhhwvgzlQwlLhJ57UFVIaM5UnQ/qg4 xWneUuEcfl6NpC6EuOYCaSA6kHYbbCYCbEk3xp8es5ToHaLFWyJWnLgIknsQdnu1soSr tsiGMA6WantKS/atgqaq8XtbLp+Ss1s1I9SwCKu6R7vLdJP9iMibPU6wY7lUq2WIFz23 7Zv6FMpC8UzenyAANOL2IO0HX2KtR4HeFNLJkriE/0Lx4W1LzNTTjtP9Um3rRI3miTru ZiQw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1725283455; x=1725888255; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:x-gm-message-state:from:to:cc:subject:date:message-id :reply-to; bh=B2OrY7LmS5ARPSvD7Xeqfyw/hCUAImQblS8V1N5kgNU=; b=Je6q6R6DF5kWp/sFCbcalVoO+zFW8rUsxhspA8FUYjTJdlVPcIrFoImQO7XmOzDDf7 JIP3QW75rvTeKBsSIL5uaYNWHUfDGLwUa/fxJuxeJicixvhWwzR6+SQtd9FalKGHeGtR DNvpeegR5MvKkkcWINa5/MG7SHG92xY+Wf35GY5R0wam58p26SS+SpAZlc8aU/bEUc96 sKHdM5LeghNqSO2mtcrbuzWK7almKga7g2QvZopQyeKiiIbkwrOTHwSDn634StLKomS1 vYGkQV3hWRN+Tuu4tZC0XwuYELBCRvk8bccb6arUQEZsRyWKrlZI1f1nKuG4scw/lI6A Ozgg== X-Forwarded-Encrypted: i=1; AJvYcCVEKaKQ2zmVW77197CWqHdQjGMfvoGYEnkSWOW3uQF3kJj+B19aMgjX869mPbToeKeZtHdpLMQ9fQ==@vger.kernel.org X-Gm-Message-State: AOJu0Yxaoe6QrqZbe5CzerftoG/QpgaOfAH9p1D0jgShbm1iqqrlHEps w9UxGp1rtaozqC8OedeoNuIxPARlUMbniln2ablPVIXc7cP6gFAzTLBhe3hpH0Q= X-Google-Smtp-Source: AGHT+IHq2+YTpWos8UI4QD8URbF/o1Hr+oJBrO2/y4dbGstIixrmAx2AK2gC4/Vkm+N+BUjHdjr3Lw== X-Received: by 2002:a17:907:7e85:b0:a7a:aa35:408a with SMTP id a640c23a62f3a-a89d87821c7mr526219066b.25.1725283455134; Mon, 02 Sep 2024 06:24:15 -0700 (PDT) Received: from claudiu-X670E-Pro-RS.. ([82.78.167.144]) by smtp.gmail.com with ESMTPSA id a640c23a62f3a-a898900f6e0sm556060266b.77.2024.09.02.06.24.13 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 02 Sep 2024 06:24:14 -0700 (PDT) From: Claudiu X-Google-Original-From: Claudiu To: geert+renesas@glider.be, mturquette@baylibre.com, sboyd@kernel.org, wim@linux-watchdog.org, linux@roeck-us.net, ulf.hansson@linaro.org Cc: linux-renesas-soc@vger.kernel.org, linux-clk@vger.kernel.org, linux-kernel@vger.kernel.org, linux-watchdog@vger.kernel.org, claudiu.beznea@tuxon.dev, linux-pm@vger.kernel.org, Claudiu Beznea Subject: [PATCH v3 0/4] watchdog: rzg2l_wdt: Enable properly the watchdog clocks and power domain Date: Mon, 2 Sep 2024 16:23:58 +0300 Message-Id: <20240902132402.2628900-1-claudiu.beznea.uj@bp.renesas.com> X-Mailer: git-send-email 2.39.2 Precedence: bulk X-Mailing-List: linux-pm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 From: Claudiu Beznea Hi, Watchdog device available on RZ/G3S SoC is part of a software-controlled power domain. The watchdog driver implements struct watchdog_ops::restart() handler which is called in atomic context via this call chain: kernel_restart() -> machine_restart() -> do_kernel_restart() -> atomic_notifier_call_chain() -> watchdog_restart_notifier() rzg2l_wdt_restart() When the rzg2l_wdt_restart() is called it may happen that the watchdog clocks to be disabled and the associated power domain to be off. Accessing watchdog registers in this state leads to aborts and system blocks. To solve this issue the watchdog power domain was marked as IRQ safe as well as watchdog device (as proposed by Ulf Hansson). Along with it the clk_prepare_enable() calls from the watchdog restart() handler were removed and all is based now on pm_runtime_resume_and_get() as explained in patch 03/03. Series contains also power domain driver changes to be able to register the watchdog PM domain as an IRQ safe one. Initial RFC series for solving this issue was posted at [1]. It is safe to merge watchdog and PM domain driver changes though different trees. Thank you, Claudiu Beznea [1] https://lore.kernel.org/all/20240619120920.2703605-1-claudiu.beznea.uj@bp.renesas.com/ Changes in v3: - added patch "clk: renesas: rzg2l-cpg: Move PM domain power on in rzg2l_cpg_pd_setup()" - addressed review comments - collected tags - per-patch changes are listed in individual patches Changes in v2: - adjusted patch title for patch 02/03 - adjusted description for patch 03/03 along with comment from code Changes since RFC: - dropped patches 01/03, 02/03 from RFC - adjusted power domain driver to be able to register the watchdog PM domain as an IRQ safe one - drop clock prepare approach from watchdog driver presented in RFC and rely only on pm_runtime_resume_and_get() - mark the watchdog device as IRQ safe Claudiu Beznea (4): clk: renesas: rzg2l-cpg: Move PM domain power on in rzg2l_cpg_pd_setup() clk: renesas: rzg2l-cpg: Use GENPD_FLAG_* flags instead of local ones clk: renesas: r9a08g045: Mark the watchdog and always-on PM domains as IRQ safe watchdog: rzg2l_wdt: Power on the watchdog domain in the restart handler drivers/clk/renesas/r9a08g045-cpg.c | 43 ++++++++++++----------------- drivers/clk/renesas/rzg2l-cpg.c | 38 ++++++++++++------------- drivers/clk/renesas/rzg2l-cpg.h | 10 ++----- drivers/watchdog/rzg2l_wdt.c | 20 ++++++++++++-- 4 files changed, 56 insertions(+), 55 deletions(-)