[PATCH 01/24] PCI: keystone: Add start_link/stop_link dw_pcie_ops

From: Kishon Vijay Abraham I <kishon@ti.com>
To: Gustavo Pimentel <gustavo.pimentel@synopsys.com>,
	Rob Herring <robh+dt@kernel.org>,
	Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Cc: Kishon Vijay Abraham I <kishon@ti.com>,
	Jingoo Han <jingoohan1@gmail.com>,
	Bjorn Helgaas <bhelgaas@google.com>,
	Mark Rutland <mark.rutland@arm.com>,
	Arnd Bergmann <arnd@arndb.de>,
	Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	Murali Karicheri <m-karicheri2@ti.com>,
	Jesper Nilsson <jesper.nilsson@axis.com>,
	<linux-pci@vger.kernel.org>, <devicetree@vger.kernel.org>,
	<linux-kernel@vger.kernel.org>, <linux-omap@vger.kernel.org>,
	<linux-arm-kernel@lists.infradead.org>,
	<linux-arm-kernel@axis.com>
Subject: [PATCH 01/24] PCI: keystone: Add start_link/stop_link dw_pcie_ops
Date: Mon, 14 Jan 2019 18:54:01 +0530	[thread overview]
Message-ID: <20190114132424.6445-2-kishon@ti.com> (raw)
In-Reply-To: <20190114132424.6445-1-kishon@ti.com>

Add start_link/stop_link dw_pcie_ops and invoke ks_pcie_start_link
directly from host_init. start_link/stop_link ops is required for
adding EP mode support.

Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>
---
 drivers/pci/controller/dwc/pci-keystone.c | 44 +++++++++++------------
 1 file changed, 22 insertions(+), 22 deletions(-)

diff --git a/drivers/pci/controller/dwc/pci-keystone.c b/drivers/pci/controller/dwc/pci-keystone.c
index 420d30ce11f4..24c38ae570b5 100644
--- a/drivers/pci/controller/dwc/pci-keystone.c
+++ b/drivers/pci/controller/dwc/pci-keystone.c
@@ -419,18 +419,33 @@ static int ks_pcie_link_up(struct dw_pcie *pci)
 	return (val == PORT_LOGIC_LTSSM_STATE_L0);
 }
 
-static void ks_pcie_initiate_link_train(struct keystone_pcie *ks_pcie)
+static void ks_pcie_stop_link(struct dw_pcie *pci)
 {
+	struct keystone_pcie *ks_pcie = to_keystone_pcie(pci);
 	u32 val;
 
 	/* Disable Link training */
 	val = ks_pcie_app_readl(ks_pcie, CMD_STATUS);
 	val &= ~LTSSM_EN_VAL;
 	ks_pcie_app_writel(ks_pcie, CMD_STATUS, LTSSM_EN_VAL | val);
+}
+
+static int ks_pcie_start_link(struct dw_pcie *pci)
+{
+	struct keystone_pcie *ks_pcie = to_keystone_pcie(pci);
+	struct device *dev = pci->dev;
+	u32 val;
+
+	if (dw_pcie_link_up(pci)) {
+		dev_dbg(dev, "link is already up\n");
+		return 0;
+	}
 
 	/* Initiate Link Training */
 	val = ks_pcie_app_readl(ks_pcie, CMD_STATUS);
 	ks_pcie_app_writel(ks_pcie, CMD_STATUS, LTSSM_EN_VAL | val);
+
+	return 0;
 }
 
 /**
@@ -515,26 +530,6 @@ static void ks_pcie_quirk(struct pci_dev *dev)
 }
 DECLARE_PCI_FIXUP_ENABLE(PCI_ANY_ID, PCI_ANY_ID, ks_pcie_quirk);
 
-static int ks_pcie_establish_link(struct keystone_pcie *ks_pcie)
-{
-	struct dw_pcie *pci = ks_pcie->pci;
-	struct device *dev = pci->dev;
-
-	if (dw_pcie_link_up(pci)) {
-		dev_info(dev, "Link already up\n");
-		return 0;
-	}
-
-	ks_pcie_initiate_link_train(ks_pcie);
-
-	/* check if the link is up or not */
-	if (!dw_pcie_wait_for_link(pci))
-		return 0;
-
-	dev_err(dev, "phy link never came up\n");
-	return -ETIMEDOUT;
-}
-
 static void ks_pcie_msi_irq_handler(struct irq_desc *desc)
 {
 	unsigned int irq = desc->irq_data.hwirq;
@@ -796,7 +791,7 @@ static int __init ks_pcie_host_init(struct pcie_port *pp)
 
 	dw_pcie_setup_rc(pp);
 
-	ks_pcie_establish_link(ks_pcie);
+	ks_pcie_stop_link(pci);
 	ks_pcie_setup_rc_app_regs(ks_pcie);
 	ks_pcie_setup_interrupts(ks_pcie);
 	writew(PCI_IO_RANGE_TYPE_32 | (PCI_IO_RANGE_TYPE_32 << 8),
@@ -813,6 +808,9 @@ static int __init ks_pcie_host_init(struct pcie_port *pp)
 	hook_fault_code(17, ks_pcie_fault, SIGBUS, 0,
 			"Asynchronous external abort");
 
+	ks_pcie_start_link(pci);
+	dw_pcie_wait_for_link(pci);
+
 	return 0;
 }
 
@@ -875,6 +873,8 @@ static const struct of_device_id ks_pcie_of_match[] = {
 };
 
 static const struct dw_pcie_ops ks_pcie_dw_pcie_ops = {
+	.start_link = ks_pcie_start_link,
+	.stop_link = ks_pcie_stop_link,
 	.link_up = ks_pcie_link_up,
 };
 
-- 
2.17.1

