From 8bcca26585585ae4b44d25d30f351ad0afa4976b Mon Sep 17 00:00:00 2001
From: Hou Zhiqiang <Zhiqiang.Hou@nxp.com>
Date: Tue, 13 Apr 2021 17:22:19 +0300
Subject: [PATCH] PCI: dwc: Move iATU detection earlier
Git-commit: 8bcca26585585ae4b44d25d30f351ad0afa4976b
Patch-mainline: v5.13-rc1
References: git-fixes

dw_pcie_ep_init() depends on the detected iATU region numbers to allocate
the in/outbound window management bitmap.  It fails after 281f1f99cf3a
("pci: dwc: Detect number of iATU windows").

Move the iATU region detection into a new function, move the detection to
the very beginning of dw_pcie_host_init() and dw_pcie_ep_init().  Also
remove it from the dw_pcie_setup(), since it's more like a software
initialization step than hardware setup.

Link: https://lore.kernel.org/r/20210125044803.4310-1-Zhiqiang.Hou@nxp.com
Link: https://lore.kernel.org/linux-pci/20210407131255.702054-1-dmitry.baryshkov@linaro.org
Link: https://lore.kernel.org/r/20210413142219.2301430-1-dmitry.baryshkov@linaro.org
Fixes: 281f1f99cf3a ("PCI: dwc: Detect number of iATU windows")
Tested-by: Kunihiko Hayashi <hayashi.kunihiko@socionext.com>
Tested-by: Marek Szyprowski <m.szyprowski@samsung.com>
Tested-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Signed-off-by: Hou Zhiqiang <Zhiqiang.Hou@nxp.com>
[db: moved dw_pcie_iatu_detect to happen after host_init callback]
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Cc: stable@vger.kernel.org	# v5.11+
Cc: Marek Szyprowski <m.szyprowski@samsung.com>
Acked-by: Takashi Iwai <tiwai@suse.de>

---
 drivers/pci/controller/dwc/pcie-designware-ep.c   |    2 ++
 drivers/pci/controller/dwc/pcie-designware-host.c |    1 +
 drivers/pci/controller/dwc/pcie-designware.c      |   11 ++++++++---
 drivers/pci/controller/dwc/pcie-designware.h      |    1 +
 4 files changed, 12 insertions(+), 3 deletions(-)

--- a/drivers/pci/controller/dwc/pcie-designware-ep.c
+++ b/drivers/pci/controller/dwc/pcie-designware-ep.c
@@ -707,6 +707,8 @@ int dw_pcie_ep_init(struct dw_pcie_ep *e
 		}
 	}
 
+	dw_pcie_iatu_detect(pci);
+
 	res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "addr_space");
 	if (!res)
 		return -EINVAL;
--- a/drivers/pci/controller/dwc/pcie-designware-host.c
+++ b/drivers/pci/controller/dwc/pcie-designware-host.c
@@ -417,6 +417,7 @@ int dw_pcie_host_init(struct pcie_port *
 		if (ret)
 			goto err_free_msi;
 	}
+	dw_pcie_iatu_detect(pci);
 
 	dw_pcie_msi_init(pp);
 
--- a/drivers/pci/controller/dwc/pcie-designware.c
+++ b/drivers/pci/controller/dwc/pcie-designware.c
@@ -610,11 +610,9 @@ static void dw_pcie_iatu_detect_regions(
 	pci->num_ob_windows = ob;
 }
 
-void dw_pcie_setup(struct dw_pcie *pci)
+void dw_pcie_iatu_detect(struct dw_pcie *pci)
 {
-	u32 val;
 	struct device *dev = pci->dev;
-	struct device_node *np = dev->of_node;
 	struct platform_device *pdev = to_platform_device(dev);
 
 	if (pci->version >= 0x480A || (!pci->version &&
@@ -643,6 +641,13 @@ void dw_pcie_setup(struct dw_pcie *pci)
 
 	dev_info(pci->dev, "Detected iATU regions: %u outbound, %u inbound",
 		 pci->num_ob_windows, pci->num_ib_windows);
+}
+
+void dw_pcie_setup(struct dw_pcie *pci)
+{
+	u32 val;
+	struct device *dev = pci->dev;
+	struct device_node *np = dev->of_node;
 
 	if (pci->link_gen > 0)
 		dw_pcie_link_set_max_speed(pci, pci->link_gen);
--- a/drivers/pci/controller/dwc/pcie-designware.h
+++ b/drivers/pci/controller/dwc/pcie-designware.h
@@ -304,6 +304,7 @@ int dw_pcie_prog_inbound_atu(struct dw_p
 void dw_pcie_disable_atu(struct dw_pcie *pci, int index,
 			 enum dw_pcie_region_type type);
 void dw_pcie_setup(struct dw_pcie *pci);
+void dw_pcie_iatu_detect(struct dw_pcie *pci);
 
 static inline void dw_pcie_writel_dbi(struct dw_pcie *pci, u32 reg, u32 val)
 {