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From: Kishon Vijay Abraham I <kishon@ti.com>
Date: Fri, 18 Aug 2017 20:28:03 +0530
Subject: PCI: dra7xx: Reset all BARs during initialization

Git-commit: 85aa13997444d7ac83da4094be513ad3fa2384b1
Patch-mainline: v4.14-rc1
References: fate#326536, fate#326532

dra7xx has all base address registers (BAR) enabled by default. Reset all
BARs during initialization and so that BARs are enabled only if they are
actually used.

Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Signed-off-by: Mian Yousaf Kaukab <yousaf.kaukab@suse.com>
---
 drivers/pci/dwc/pci-dra7xx.c | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/drivers/pci/dwc/pci-dra7xx.c b/drivers/pci/dwc/pci-dra7xx.c
index f2fc5f47064e..ee61f833b62c 100644
--- a/drivers/pci/dwc/pci-dra7xx.c
+++ b/drivers/pci/dwc/pci-dra7xx.c
@@ -335,10 +335,23 @@ static irqreturn_t dra7xx_pcie_irq_handler(int irq, void *arg)
 	return IRQ_HANDLED;
 }
 
+static void dw_pcie_ep_reset_bar(struct dw_pcie *pci, enum pci_barno bar)
+{
+	u32 reg;
+
+	reg = PCI_BASE_ADDRESS_0 + (4 * bar);
+	dw_pcie_writel_dbi2(pci, reg, 0x0);
+	dw_pcie_writel_dbi(pci, reg, 0x0);
+}
+
 static void dra7xx_pcie_ep_init(struct dw_pcie_ep *ep)
 {
 	struct dw_pcie *pci = to_dw_pcie_from_ep(ep);
 	struct dra7xx_pcie *dra7xx = to_dra7xx_pcie(pci);
+	enum pci_barno bar;
+
+	for (bar = BAR_0; bar <= BAR_5; bar++)
+		dw_pcie_ep_reset_bar(pci, bar);
 
 	dra7xx_pcie_enable_wrapper_interrupts(dra7xx);
 }
-- 
2.11.0