From patchwork Thu Feb 15 15:17:49 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Thomas Richard X-Patchwork-Id: 13558626 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 4F244C48BC4 for ; Thu, 15 Feb 2024 15:19:03 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:Cc:To:In-Reply-To:References:Message-Id :MIME-Version:Subject:Date:From:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=Q1aUIYz0F1MKsFE3iP2EWUkVAFuz6if3FATWbaOH0Jg=; b=jpuBapXDNQYDB5 fURDz4NZ1bOZMWY5/VrcDuEMQZVkuFoz82Na9vb9AIoXeaQgAWD3SKqNJskM79HlsXHbkgFQ2I2hD +uxdnsu+IeN1eS98LdgfaiPMMmBHJbA1DXmgCNndG7UP5jU0aRY6WC1kR0SHTWkZ/9kaE4A5GM8zL h7KWcg7PF7koyIZwcikAb1N9ZOqRr0SsG00cNrtvgttvIv0oyj3hUAWHlZm9DYcZBohq2dPJR7+EO 07VKsA/WTzKndFH7WkMWmfQs1/lclctW3++QuSeohNWAKiNg+vz5+nXimHACcdPH+xS3yfOyej7p5 TzGvM6h1pOqemCPuCovg==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.97.1 #2 (Red Hat Linux)) id 1radVe-0000000GhGH-1vdP; Thu, 15 Feb 2024 15:18:46 +0000 Received: from relay1-d.mail.gandi.net ([2001:4b98:dc4:8::221]) by bombadil.infradead.org with esmtps (Exim 4.97.1 #2 (Red Hat Linux)) id 1radV1-0000000Ggog-2NcR; Thu, 15 Feb 2024 15:18:10 +0000 Received: by mail.gandi.net (Postfix) with ESMTPSA id 06364240006; Thu, 15 Feb 2024 15:18:02 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=bootlin.com; s=gm1; t=1708010284; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=5Nb4IKDaAI4vBqYGKsypVxdn/pv7j5S+qa35Zvmbq10=; b=a1sPo+SljVkvFgmvNstzu6qhGzIn8T2Jlq8tR6v7f3Wbt2waxMx0PuXyqzenCM75tzcGFX /EFaVr4qjHtDeGymq+4E5AB4rp8tCP1yfFcg2ezFRM5SF2tHoz+oGaVIYhdUDJDDuKqQkX RMfkk8TZENhJCHFuKZRiqlsZU5G9g6gmNL0swzNg3pxdi92grHlbi6MIUQnYmxpu3f9Ueu aZEd4yXKtB7eHTAtqi/3ORkRti+LBBzONHFZbGbrEJJdrI41gF656WQxq8D1waPDOhrNEJ m+ECSeFtL8qio+b0CmbOQxBVJDbd5Yr8KkltuhGdubtNpfYUCvmb8wxccoMPyw== From: Thomas Richard Date: Thu, 15 Feb 2024 16:17:49 +0100 Subject: [PATCH v3 04/18] i2c: omap: wakeup the controller during suspend() callback MIME-Version: 1.0 Message-Id: <20240102-j7200-pcie-s2r-v3-4-5c2e4a3fac1f@bootlin.com> References: <20240102-j7200-pcie-s2r-v3-0-5c2e4a3fac1f@bootlin.com> In-Reply-To: <20240102-j7200-pcie-s2r-v3-0-5c2e4a3fac1f@bootlin.com> To: Linus Walleij , Bartosz Golaszewski , Andy Shevchenko , Tony Lindgren , Haojian Zhuang , Vignesh R , Aaro Koskinen , Janusz Krzysztofik , Andi Shyti , Peter Rosin , Vinod Koul , Kishon Vijay Abraham I , Philipp Zabel , Lorenzo Pieralisi , =?utf-8?q?Krzysztof_Wilczy?= =?utf-8?q?=C5=84ski?= , Rob Herring , Bjorn Helgaas Cc: linux-gpio@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-omap@vger.kernel.org, linux-i2c@vger.kernel.org, linux-phy@lists.infradead.org, linux-pci@vger.kernel.org, gregory.clement@bootlin.com, theo.lebrun@bootlin.com, thomas.petazzoni@bootlin.com, u-kumar1@ti.com, Thomas Richard X-Mailer: b4 0.12.0 X-GND-Sasl: thomas.richard@bootlin.com X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20240215_071808_010658_B7F3418B X-CRM114-Status: GOOD ( 13.41 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org A device may need the controller up during suspend_noirq() or resume_noirq(). But if the controller is autosuspended, there is no way to wakeup it during suspend_noirq() or resume_noirq() because runtime pm is disabled at this time. The suspend() callback wakes up the controller, so it is available until its suspend_noirq() callback (pm_runtime_force_suspend()). During the resume, it's restored by resume_noirq() callback (pm_runtime_force_resume()). Then resume() callback enables autosuspend. So the controller is up during a little time slot in suspend and resume sequences even if it's not used. Signed-off-by: Thomas Richard --- drivers/i2c/busses/i2c-omap.c | 22 ++++++++++++++++++++++ 1 file changed, 22 insertions(+) diff --git a/drivers/i2c/busses/i2c-omap.c b/drivers/i2c/busses/i2c-omap.c index 42165ef57946..c11deb285114 100644 --- a/drivers/i2c/busses/i2c-omap.c +++ b/drivers/i2c/busses/i2c-omap.c @@ -1575,9 +1575,31 @@ static int __maybe_unused omap_i2c_runtime_resume(struct device *dev) return 0; } +static int omap_i2c_suspend(struct device *dev) +{ + /* + * If the controller is autosuspended, there is no way to wakeup it once + * runtime pm is disabled (in suspend_late()). + * But a device may need the controller up during suspend_noirq() or + * resume_noirq(). + * Wakeup the controller while runtime pm is enabled, so it is available until + * its suspend_noirq(), and from resume_noirq(). + */ + return pm_runtime_resume_and_get(dev); +} + +static int omap_i2c_resume(struct device *dev) +{ + pm_runtime_mark_last_busy(dev); + pm_runtime_put_autosuspend(dev); + + return 0; +} + static const struct dev_pm_ops omap_i2c_pm_ops = { SET_NOIRQ_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend, pm_runtime_force_resume) + SET_SYSTEM_SLEEP_PM_OPS(omap_i2c_suspend, omap_i2c_resume) SET_RUNTIME_PM_OPS(omap_i2c_runtime_suspend, omap_i2c_runtime_resume, NULL) };