From patchwork Mon Jan 15 16:14:55 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Thomas Richard X-Patchwork-Id: 763161 Received: from relay6-d.mail.gandi.net (relay6-d.mail.gandi.net [217.70.183.198]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 6CA961A282; Mon, 15 Jan 2024 16:16:33 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=bootlin.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=bootlin.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=bootlin.com header.i=@bootlin.com header.b="cYFsUOgl" Received: by mail.gandi.net (Postfix) with ESMTPSA id B13B1C0013; Mon, 15 Jan 2024 16:16:30 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=bootlin.com; s=gm1; t=1705335391; 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=Xl/fBZ1aUKL0hWMZVIAmwRdTreoofQFnHKDzk938IBg=; b=cYFsUOgl6y7i2QuPpsxsXWBrOBwsQ90mM3tk+a1DxY/7dFN4h/eO7KKH3s1uiLM6iQv4KK 04a/UkuS2hDma7uli8r7cwrd/YRBsweBdnep0Ox3XvjPj9dsvdV0+V8Dz/mBzypQ5Iqu9z HB+xGlK9bIWWSpoz4LZZvDOyYWdFJ8mISjZ7AsF/+karA/IsfPBU/T0SzhQQLhz03pnaWI nxu4Hd+kFzQ6zYEt+zZViZQSiFWITjkIdicyPh22QOS9CXNnLh7P6X0CKHiDvRccg7gwHC Ff5Z32FMODVnAQ963/KoO/YhyuurA4DFam8aB5kK61mZElvfDZSOG5C/qh8iDg== From: Thomas Richard Date: Mon, 15 Jan 2024 17:14:55 +0100 Subject: [PATCH 14/14] PCI: j721e: add suspend and resume support Precedence: bulk X-Mailing-List: linux-gpio@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Message-Id: <20240102-j7200-pcie-s2r-v1-14-84e55da52400@bootlin.com> References: <20240102-j7200-pcie-s2r-v1-0-84e55da52400@bootlin.com> In-Reply-To: <20240102-j7200-pcie-s2r-v1-0-84e55da52400@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 , Tom Joseph , 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 From: Théo Lebrun Add suspend and resume support for rc mode. Signed-off-by: Théo Lebrun Signed-off-by: Thomas Richard --- drivers/pci/controller/cadence/pci-j721e.c | 72 +++++++++++++++++++++++++++ drivers/pci/controller/cadence/pcie-cadence.h | 3 +- 2 files changed, 74 insertions(+), 1 deletion(-) diff --git a/drivers/pci/controller/cadence/pci-j721e.c b/drivers/pci/controller/cadence/pci-j721e.c index 477275d72257..51867a3f2499 100644 --- a/drivers/pci/controller/cadence/pci-j721e.c +++ b/drivers/pci/controller/cadence/pci-j721e.c @@ -6,6 +6,7 @@ * Author: Kishon Vijay Abraham I */ +#include #include #include #include @@ -554,6 +555,76 @@ static void j721e_pcie_remove(struct platform_device *pdev) pm_runtime_disable(dev); } +#ifdef CONFIG_PM +static int j721e_pcie_suspend_noirq(struct device *dev) +{ + struct j721e_pcie *pcie = dev_get_drvdata(dev); + + if (pcie->mode == PCI_MODE_RC) { + if (pcie->reset_gpio) + gpiod_set_value_cansleep(pcie->reset_gpio, 0); + + clk_disable_unprepare(pcie->refclk); + } + + cdns_pcie_disable_phy(pcie->cdns_pcie); + + return 0; +} + +static int j721e_pcie_resume_noirq(struct device *dev) +{ + struct j721e_pcie *pcie = dev_get_drvdata(dev); + struct cdns_pcie *cdns_pcie = pcie->cdns_pcie; + int ret; + + ret = j721e_pcie_ctrl_init(pcie); + if (ret < 0) { + dev_err(dev, "j721e_pcie_ctrl_init failed\n"); + return ret; + } + + j721e_pcie_config_link_irq(pcie); + + /* + * This is not called explicitly in the probe, it is called by + * cdns_pcie_init_phy. + */ + ret = cdns_pcie_enable_phy(pcie->cdns_pcie); + if (ret < 0) { + dev_err(dev, "cdns_pcie_enable_phy failed\n"); + return -ENODEV; + } + + if (pcie->mode == PCI_MODE_RC) { + struct cdns_pcie_rc *rc = cdns_pcie_to_rc(cdns_pcie); + + ret = clk_prepare_enable(pcie->refclk); + if (ret < 0) { + dev_err(dev, "clk_prepare_enable failed\n"); + return -ENODEV; + } + + if (pcie->reset_gpio) { + usleep_range(100, 200); + gpiod_set_value_cansleep(pcie->reset_gpio, 1); + } + + ret = cdns_pcie_host_setup(rc, false); + if (ret < 0) { + clk_disable_unprepare(pcie->refclk); + return -ENODEV; + } + } + + return 0; +} + +static const struct dev_pm_ops j721e_pcie_pm_ops = { + SET_NOIRQ_SYSTEM_SLEEP_PM_OPS(j721e_pcie_suspend_noirq, j721e_pcie_resume_noirq) +}; +#endif + static struct platform_driver j721e_pcie_driver = { .probe = j721e_pcie_probe, .remove_new = j721e_pcie_remove, @@ -561,6 +632,7 @@ static struct platform_driver j721e_pcie_driver = { .name = "j721e-pcie", .of_match_table = of_j721e_pcie_match, .suppress_bind_attrs = true, + .pm = pm_ptr(&j721e_pcie_pm_ops), }, }; builtin_platform_driver(j721e_pcie_driver); diff --git a/drivers/pci/controller/cadence/pcie-cadence.h b/drivers/pci/controller/cadence/pcie-cadence.h index 3b0da889ed64..05d4b96fc71d 100644 --- a/drivers/pci/controller/cadence/pcie-cadence.h +++ b/drivers/pci/controller/cadence/pcie-cadence.h @@ -331,6 +331,8 @@ struct cdns_pcie_rc { unsigned int quirk_detect_quiet_flag:1; }; +#define cdns_pcie_to_rc(p) container_of(p, struct cdns_pcie_rc, pcie) + /** * struct cdns_pcie_epf - Structure to hold info about endpoint function * @epf: Info about virtual functions attached to the physical function @@ -381,7 +383,6 @@ struct cdns_pcie_ep { unsigned int quirk_disable_flr:1; }; - /* Register access */ static inline void cdns_pcie_writel(struct cdns_pcie *pcie, u32 reg, u32 value) {