From patchwork Thu Oct 24 20:18:30 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Stefan Wahren X-Patchwork-Id: 13849674 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 A812CD0E415 for ; Thu, 24 Oct 2024 20:28:24 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:Content-Transfer-Encoding: MIME-Version:References:In-Reply-To:Message-Id:Date:Subject:Cc:To:From: Reply-To:Content-Type:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; 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b=FWZYMB4i6pII+5Cu3Z5TKjNhZw3OeczRSY9NS1oKV+6nCpO5qBxWkFSMzQy3ryjy sTBPl6mymi8N8pfcjQTGHeixmz1FlytcthQTMKfUKj6lj84V+VBjLmBq3UgalJkva JEaQFMRjgNbNbdMEaPmK+wAshzpYPXvTCn17cGjSsKzmWYik3rbrkKHlLo1ybXYgw nmpXqDpNELx0KrelSEq2Bs+U+6YillRq8IJ0viD5X7COpWmtluzO7vibsakKMu5Bg Ozx3pTFWgU0KSPGK/Rcz7+ZbUURtla0EhwLwSQm4nJlNpYgFvArJgR7y1qypvMbPj CC9yErUmZ94S0rAR6w== X-UI-Sender-Class: 724b4f7f-cbec-4199-ad4e-598c01a50d3a Received: from stefanw-SCHENKER ([37.4.248.43]) by mail.gmx.net (mrgmx005 [212.227.17.190]) with ESMTPSA (Nemesis) id 1MacSe-1taMqF1UCo-00fMm2; Thu, 24 Oct 2024 22:18:45 +0200 From: Stefan Wahren To: Russell King , Florian Fainelli , Ray Jui , Scott Branden , Vinod Koul , Ulf Hansson , Minas Harutyunyan , Greg Kroah-Hartman Cc: Lukas Wunner , Peter Robinson , linux-arm-kernel@lists.infradead.org, kernel-list@raspberrypi.com, bcm-kernel-feedback-list@broadcom.com, dmaengine@vger.kernel.org, linux-mmc@vger.kernel.org, linux-usb@vger.kernel.org, Stefan Wahren Subject: [PATCH 2/9] dmaengine: bcm2835-dma: add suspend/resume pm support Date: Thu, 24 Oct 2024 22:18:30 +0200 Message-Id: <20241024201837.79927-3-wahrenst@gmx.net> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20241024201837.79927-1-wahrenst@gmx.net> References: <20241024201837.79927-1-wahrenst@gmx.net> MIME-Version: 1.0 X-Provags-ID: V03:K1:uurm7aNTi5uMv/4ThSbmO9f2OZgP0MZnWhjwfJlbBd5reY0RN+4 IAVrERajL/SXD91WlaaM5YamNsh/dSKucmU55D5SaAEEQkoqZBY/JHgqNxRpe0I5XTRShXL 3u/VkDO3dMzYYk6cWKJTvkzd/3tQ0Ng04QCY6SWoGEJClobXZpUdzZj1vDLuxu1P9YxyRx2 DKKtsV1iGb8R5B/hQ1oVQ== UI-OutboundReport: notjunk:1;M01:P0:+I6/p0Kc/ug=;MnMyC57laSsmSHRtvqZJ29mp/Nb ePBEqIpKuQ7RKFK7KACh+NKHeayIpTFmIwoSOdWHe1XRErBmYkSoLGDQhOKUpPUTsWVcFue/i rUMTicPtvX9cqyD1KQ4eJvQvH+nWcurtOmNmBXo+bi0dofmvddlAj5McAgWtBvMG6GYIFIrN9 oE16Y/uJh2Hd/R/euG0xJDULNTZbEw6tgfXATdhS3kFFfnSNUfV4EWSyfW73EmSIF6hrN2Hk5 B6gS5N/IdG7wtL26mujzFnpR0JNUP+xJ/bCsn3e7pHmNOgrGvsZ5FHx/uxVu6hoJ8/LLOsp5j X+dXXB6VOjJHgV8mQD2mmBETQaZkP/A3mECb8xigYDHAL85umvvilsWxnTpQs2NnS/8PKYT73 0S8ZqdPMEymxnWMvafKsHgo4IIj9k9pCTXc7kg0U8jtrowurSIYRfvqmvwEKjXAVFqD04rQbr gfwFAg3nzhPJqQEmiypB8qeicZn4Fn1nGB6b3OByUjjwQJahLl+n4qPrB+H0dTnj1lw5pvP0f g+HpQXexssH1UuWRKnCBu2LY8DUUjarhkvk34n9DmeqFB3hLOm0VwBw6b0rSLCnkgcbEgh3my l8rtV8v9UH6OZMRY3/p2p/6fD4jBiWfNovx09+EJx5dbyFPaDmTlL0e2VnLWbWhJVmLq4yGwo abyowlcPDncsKoUBF/ywor+7bT9STzwNIpIAC8BLXDpYwUCNWiSG5k6O1K5XdwOpwMRWObVyi j3obmgQUA3H0m1j5dleEczNfwxENYHJo8t1h3CMl/C6Zq2F8/ZEAicuhUFBP8n3BEBQWB/B8P qcoHpZmtzh6PglEjii4PGTrQ== X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20241024_131856_413350_2021BB46 X-CRM114-Status: GOOD ( 12.16 ) 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 bcm2835-dma provides the service to others, so it should suspend late and resume early. Signed-off-by: Stefan Wahren --- drivers/dma/bcm2835-dma.c | 30 ++++++++++++++++++++++++++++++ 1 file changed, 30 insertions(+) -- 2.34.1 diff --git a/drivers/dma/bcm2835-dma.c b/drivers/dma/bcm2835-dma.c index e1b92b4d7b05..647dda9f3376 100644 --- a/drivers/dma/bcm2835-dma.c +++ b/drivers/dma/bcm2835-dma.c @@ -875,6 +875,35 @@ static struct dma_chan *bcm2835_dma_xlate(struct of_phandle_args *spec, return chan; } +static int bcm2835_dma_suspend_late(struct device *dev) +{ + struct bcm2835_dmadev *od = dev_get_drvdata(dev); + struct bcm2835_chan *c, *next; + + list_for_each_entry_safe(c, next, &od->ddev.channels, + vc.chan.device_node) { + void __iomem *chan_base = c->chan_base; + + if (readl(chan_base + BCM2835_DMA_ADDR)) { + dev_warn(dev, "Suspend is prevented by chan %d\n", + c->ch); + return -EBUSY; + } + } + + return 0; +} + +static int bcm2835_dma_resume_early(struct device *dev) +{ + return 0; +} + +static const struct dev_pm_ops bcm2835_dma_pm_ops = { + SET_LATE_SYSTEM_SLEEP_PM_OPS(bcm2835_dma_suspend_late, + bcm2835_dma_resume_early) +}; + static int bcm2835_dma_probe(struct platform_device *pdev) { struct bcm2835_dmadev *od; @@ -1033,6 +1062,7 @@ static struct platform_driver bcm2835_dma_driver = { .driver = { .name = "bcm2835-dma", .of_match_table = of_match_ptr(bcm2835_dma_of_match), + .pm = pm_ptr(&bcm2835_dma_pm_ops), }, };