linux-kernel - [PATCH v8 10/11] PCI: kirin: fix poweroff sequence

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Message-Id: <00de31f5b43974cfa870a0eed67f7ae821475bc9.1627637745.git.mchehab+huawei@kernel.org>
Date:   Fri, 30 Jul 2021 11:50:13 +0200
From:   Mauro Carvalho Chehab <mchehab+huawei@...nel.org>
To:     Vinod Koul <vkoul@...nel.org>, Bjorn Helgaas <bhelgaas@...gle.com>,
        Rob Herring <robh@...nel.org>
Cc:     Mauro Carvalho Chehab <mchehab+huawei@...nel.org>,
        Krzysztof Wilczyński <kw@...ux.com>,
        Binghui Wang <wangbinghui@...ilicon.com>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Xiaowei Song <songxiaowei@...ilicon.com>,
        linux-kernel@...r.kernel.org, linux-pci@...r.kernel.org
Subject: [PATCH v8 10/11] PCI: kirin: fix poweroff sequence

This driver currently doesn't call dw_pcie_host_deinit()
at the .remove() callback. This can cause an OOPS if the driver
is unbound.

While here, add a poweroff function, in order to abstract
between the internal and external PHY logic.

Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@...nel.org>
---
 drivers/pci/controller/dwc/pcie-kirin.c | 30 ++++++++++++++++---------
 1 file changed, 20 insertions(+), 10 deletions(-)

diff --git a/drivers/pci/controller/dwc/pcie-kirin.c b/drivers/pci/controller/dwc/pcie-kirin.c
index 58a993a998f3..bdf45d29cdc3 100644
--- a/drivers/pci/controller/dwc/pcie-kirin.c
+++ b/drivers/pci/controller/dwc/pcie-kirin.c
@@ -683,6 +683,23 @@ static const struct dw_pcie_host_ops kirin_pcie_host_ops = {
 	.host_init = kirin_pcie_host_init,
 };
 
+static int kirin_pcie_power_off(struct kirin_pcie *kirin_pcie)
+{
+	int i;
+
+	if (kirin_pcie->type == PCIE_KIRIN_INTERNAL_PHY)
+		return hi3660_pcie_phy_power_off(kirin_pcie);
+
+	for (i = 0; i < kirin_pcie->n_gpio_clkreq; i++) {
+		gpio_direction_output(kirin_pcie->gpio_id_clkreq[i], 1);
+	}
+
+	phy_power_off(kirin_pcie->phy);
+	phy_exit(kirin_pcie->phy);
+
+	return 0;
+}
+
 static int kirin_pcie_power_on(struct platform_device *pdev,
 			       struct kirin_pcie *kirin_pcie)
 {
@@ -728,12 +745,7 @@ static int kirin_pcie_power_on(struct platform_device *pdev,
 
 	return 0;
 err:
-	if (kirin_pcie->type == PCIE_KIRIN_INTERNAL_PHY) {
-		hi3660_pcie_phy_power_off(kirin_pcie);
-	} else {
-		phy_power_off(kirin_pcie->phy);
-		phy_exit(kirin_pcie->phy);
-	}
+	kirin_pcie_power_off(kirin_pcie);
 
 	return ret;
 }
@@ -742,11 +754,9 @@ static int __exit kirin_pcie_remove(struct platform_device *pdev)
 {
 	struct kirin_pcie *kirin_pcie = platform_get_drvdata(pdev);
 
-	if (kirin_pcie->type == PCIE_KIRIN_INTERNAL_PHY)
-		return hi3660_pcie_phy_power_off(kirin_pcie);
+	dw_pcie_host_deinit(&kirin_pcie->pci->pp);
 
-	phy_power_off(kirin_pcie->phy);
-	phy_exit(kirin_pcie->phy);
+	kirin_pcie_power_off(kirin_pcie);
 
 	return 0;
 }
-- 
2.31.1