linux-kernel - [PATCH V5 2/3] PCI: qcom-ep: Refactor EP initialization completion

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Date:   Thu, 13 Oct 2022 23:27:11 +0530
From:   Vidya Sagar <vidyas@...dia.com>
To:     <jingoohan1@...il.com>, <gustavo.pimentel@...opsys.com>,
        <lpieralisi@...nel.org>, <robh@...nel.org>, <kw@...ux.com>,
        <bhelgaas@...gle.com>, <mani@...nel.org>,
        <Sergey.Semin@...kalelectronics.ru>, <dmitry.baryshkov@...aro.org>,
        <linmq006@...il.com>, <ffclaire1224@...il.com>
CC:     <thierry.reding@...il.com>, <jonathanh@...dia.com>,
        <linux-pci@...r.kernel.org>, <linux-arm-msm@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <kthota@...dia.com>,
        <mmaddireddy@...dia.com>, <vidyas@...dia.com>, <sagar.tv@...il.com>
Subject: [PATCH V5 2/3] PCI: qcom-ep: Refactor EP initialization completion

Move the post initialization code to .ep_init_late() call back and call
only dw_pcie_ep_init_notify() which internally takes care of calling
dw_pcie_ep_init_complete().

Signed-off-by: Vidya Sagar <vidyas@...dia.com>
---
V5:
* None

V4:
* New patch in this series

 drivers/pci/controller/dwc/pcie-qcom-ep.c | 27 ++++++++++++++---------
 1 file changed, 16 insertions(+), 11 deletions(-)

diff --git a/drivers/pci/controller/dwc/pcie-qcom-ep.c b/drivers/pci/controller/dwc/pcie-qcom-ep.c
index e33eb3871309..c418b20042aa 100644
--- a/drivers/pci/controller/dwc/pcie-qcom-ep.c
+++ b/drivers/pci/controller/dwc/pcie-qcom-ep.c
@@ -361,22 +361,12 @@ static int qcom_pcie_perst_deassert(struct dw_pcie *pci)
 	      PARF_INT_ALL_LINK_UP;
 	writel_relaxed(val, pcie_ep->parf + PARF_INT_ALL_MASK);
 
-	ret = dw_pcie_ep_init_complete(&pcie_ep->pci.ep);
+	ret = dw_pcie_ep_init_notify(&pcie_ep->pci.ep);
 	if (ret) {
 		dev_err(dev, "Failed to complete initialization: %d\n", ret);
 		goto err_disable_resources;
 	}
 
-	/*
-	 * The physical address of the MMIO region which is exposed as the BAR
-	 * should be written to MHI BASE registers.
-	 */
-	writel_relaxed(pcie_ep->mmio_res->start,
-		       pcie_ep->parf + PARF_MHI_BASE_ADDR_LOWER);
-	writel_relaxed(0, pcie_ep->parf + PARF_MHI_BASE_ADDR_UPPER);
-
-	dw_pcie_ep_init_notify(&pcie_ep->pci.ep);
-
 	/* Enable LTSSM */
 	val = readl_relaxed(pcie_ep->parf + PARF_LTSSM);
 	val |= BIT(8);
@@ -643,8 +633,23 @@ static void qcom_pcie_ep_init(struct dw_pcie_ep *ep)
 		dw_pcie_ep_reset_bar(pci, bar);
 }
 
+static void qcom_pcie_ep_init_late(struct dw_pcie_ep *ep)
+{
+	struct dw_pcie *pci = to_dw_pcie_from_ep(ep);
+	struct qcom_pcie_ep *pcie_ep = to_pcie_ep(pci);
+
+	/*
+	 * The physical address of the MMIO region which is exposed as the BAR
+	 * should be written to MHI BASE registers.
+	 */
+	writel_relaxed(pcie_ep->mmio_res->start,
+		       pcie_ep->parf + PARF_MHI_BASE_ADDR_LOWER);
+	writel_relaxed(0, pcie_ep->parf + PARF_MHI_BASE_ADDR_UPPER);
+}
+
 static const struct dw_pcie_ep_ops pci_ep_ops = {
 	.ep_init = qcom_pcie_ep_init,
+	.ep_init_late = qcom_pcie_ep_init_late,
 	.raise_irq = qcom_pcie_ep_raise_irq,
 	.get_features = qcom_pcie_epc_get_features,
 };
-- 
2.17.1