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From: Thomas Richard <thomas.richard@bootlin.com>
Date: Mon, 15 Jan 2024 17:14:53 +0100
Subject: [PATCH 12/14] PCI: cadence: add resume support to
 cdns_pcie_host_setup()
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Message-Id: <20240102-j7200-pcie-s2r-v1-12-84e55da52400@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 <linus.walleij@linaro.org>, 
 Bartosz Golaszewski <brgl@bgdev.pl>, Andy Shevchenko <andy@kernel.org>, 
 Tony Lindgren <tony@atomide.com>, 
 Haojian Zhuang <haojian.zhuang@linaro.org>, Vignesh R <vigneshr@ti.com>, 
 Aaro Koskinen <aaro.koskinen@iki.fi>, 
 Janusz Krzysztofik <jmkrzyszt@gmail.com>, 
 Andi Shyti <andi.shyti@kernel.org>, Peter Rosin <peda@axentia.se>, 
 Vinod Koul <vkoul@kernel.org>, Kishon Vijay Abraham I <kishon@kernel.org>, 
 Philipp Zabel <p.zabel@pengutronix.de>, Tom Joseph <tjoseph@cadence.com>, 
 Lorenzo Pieralisi <lpieralisi@kernel.org>, 
 =?utf-8?q?Krzysztof_Wilczy=C5=84ski?= <kw@linux.com>, 
 Rob Herring <robh@kernel.org>, Bjorn Helgaas <bhelgaas@google.com>
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 <thomas.richard@bootlin.com>

From: Théo Lebrun <theo.lebrun@bootlin.com>

That function mixes probe structure init and hardware config.
The whole hardware config part must be done at resume after a suspend to
ram.
We therefore pass it a boolean flag determining if we are at probe or at
resume.

Signed-off-by: Théo Lebrun <theo.lebrun@bootlin.com>
Signed-off-by: Thomas Richard <thomas.richard@bootlin.com>
---
 drivers/pci/controller/cadence/pci-j721e.c         |  2 +-
 drivers/pci/controller/cadence/pcie-cadence-host.c | 49 ++++++++++++----------
 drivers/pci/controller/cadence/pcie-cadence-plat.c |  2 +-
 drivers/pci/controller/cadence/pcie-cadence.h      |  4 +-
 4 files changed, 30 insertions(+), 27 deletions(-)

diff --git a/drivers/pci/controller/cadence/pci-j721e.c b/drivers/pci/controller/cadence/pci-j721e.c
index 2c87e7728a65..9b343a46da11 100644
--- a/drivers/pci/controller/cadence/pci-j721e.c
+++ b/drivers/pci/controller/cadence/pci-j721e.c
@@ -509,7 +509,7 @@ static int j721e_pcie_probe(struct platform_device *pdev)
 			gpiod_set_value_cansleep(gpiod, 1);
 		}
 
-		ret = cdns_pcie_host_setup(rc);
+		ret = cdns_pcie_host_setup(rc, true);
 		if (ret < 0) {
 			clk_disable_unprepare(pcie->refclk);
 			goto err_pcie_setup;
diff --git a/drivers/pci/controller/cadence/pcie-cadence-host.c b/drivers/pci/controller/cadence/pcie-cadence-host.c
index 5b14f7ee3c79..dd4d876a9138 100644
--- a/drivers/pci/controller/cadence/pcie-cadence-host.c
+++ b/drivers/pci/controller/cadence/pcie-cadence-host.c
@@ -497,14 +497,14 @@ static int cdns_pcie_host_init(struct device *dev,
 	return cdns_pcie_host_init_address_translation(rc);
 }
 
-int cdns_pcie_host_setup(struct cdns_pcie_rc *rc)
+int cdns_pcie_host_setup(struct cdns_pcie_rc *rc, bool probe)
 {
 	struct device *dev = rc->pcie.dev;
 	struct platform_device *pdev = to_platform_device(dev);
 	struct device_node *np = dev->of_node;
 	struct pci_host_bridge *bridge;
 	enum cdns_pcie_rp_bar bar;
-	struct cdns_pcie *pcie;
+	struct cdns_pcie *pcie = &rc->pcie;
 	struct resource *res;
 	int ret;
 
@@ -512,26 +512,27 @@ int cdns_pcie_host_setup(struct cdns_pcie_rc *rc)
 	if (!bridge)
 		return -ENOMEM;
 
-	pcie = &rc->pcie;
-	pcie->is_rc = true;
+	if (probe) {
+		pcie->is_rc = true;
 
-	rc->vendor_id = 0xffff;
-	of_property_read_u32(np, "vendor-id", &rc->vendor_id);
+		rc->vendor_id = 0xffff;
+		of_property_read_u32(np, "vendor-id", &rc->vendor_id);
 
-	rc->device_id = 0xffff;
-	of_property_read_u32(np, "device-id", &rc->device_id);
+		rc->device_id = 0xffff;
+		of_property_read_u32(np, "device-id", &rc->device_id);
 
-	pcie->reg_base = devm_platform_ioremap_resource_byname(pdev, "reg");
-	if (IS_ERR(pcie->reg_base)) {
-		dev_err(dev, "missing \"reg\"\n");
-		return PTR_ERR(pcie->reg_base);
-	}
+		pcie->reg_base = devm_platform_ioremap_resource_byname(pdev, "reg");
+		if (IS_ERR(pcie->reg_base)) {
+			dev_err(dev, "missing \"reg\"\n");
+			return PTR_ERR(pcie->reg_base);
+		}
 
-	res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "cfg");
-	rc->cfg_base = devm_pci_remap_cfg_resource(dev, res);
-	if (IS_ERR(rc->cfg_base))
-		return PTR_ERR(rc->cfg_base);
-	rc->cfg_res = res;
+		res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "cfg");
+		rc->cfg_base = devm_pci_remap_cfg_resource(dev, res);
+		if (IS_ERR(rc->cfg_base))
+			return PTR_ERR(rc->cfg_base);
+		rc->cfg_res = res;
+	}
 
 	if (rc->quirk_detect_quiet_flag)
 		cdns_pcie_detect_quiet_min_delay_set(&rc->pcie);
@@ -555,12 +556,14 @@ int cdns_pcie_host_setup(struct cdns_pcie_rc *rc)
 	if (ret)
 		return ret;
 
-	if (!bridge->ops)
-		bridge->ops = &cdns_pcie_host_ops;
+	if (probe) {
+		if (!bridge->ops)
+			bridge->ops = &cdns_pcie_host_ops;
 
-	ret = pci_host_probe(bridge);
-	if (ret < 0)
-		goto err_init;
+		ret = pci_host_probe(bridge);
+		if (ret < 0)
+			goto err_init;
+	}
 
 	return 0;
 
diff --git a/drivers/pci/controller/cadence/pcie-cadence-plat.c b/drivers/pci/controller/cadence/pcie-cadence-plat.c
index 0456845dabb9..071423091668 100644
--- a/drivers/pci/controller/cadence/pcie-cadence-plat.c
+++ b/drivers/pci/controller/cadence/pcie-cadence-plat.c
@@ -86,7 +86,7 @@ static int cdns_plat_pcie_probe(struct platform_device *pdev)
 			goto err_get_sync;
 		}
 
-		ret = cdns_pcie_host_setup(rc);
+		ret = cdns_pcie_host_setup(rc, true);
 		if (ret)
 			goto err_init;
 	} else {
diff --git a/drivers/pci/controller/cadence/pcie-cadence.h b/drivers/pci/controller/cadence/pcie-cadence.h
index 373cb50fcd15..3b0da889ed64 100644
--- a/drivers/pci/controller/cadence/pcie-cadence.h
+++ b/drivers/pci/controller/cadence/pcie-cadence.h
@@ -515,11 +515,11 @@ static inline bool cdns_pcie_link_up(struct cdns_pcie *pcie)
 }
 
 #ifdef CONFIG_PCIE_CADENCE_HOST
-int cdns_pcie_host_setup(struct cdns_pcie_rc *rc);
+int cdns_pcie_host_setup(struct cdns_pcie_rc *rc, bool probe);
 void __iomem *cdns_pci_map_bus(struct pci_bus *bus, unsigned int devfn,
 			       int where);
 #else
-static inline int cdns_pcie_host_setup(struct cdns_pcie_rc *rc)
+static inline int cdns_pcie_host_setup(struct cdns_pcie_rc *rc, bool probe)
 {
 	return 0;
 }

-- 
2.39.2