linux-kernel - [PATCH v12 09/11] PCI: kirin: Add power

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Date:   Tue, 28 Sep 2021 09:34:19 +0200
From:   Mauro Carvalho Chehab <mchehab+huawei@...nel.org>
To:     Bjorn Helgaas <bhelgaas@...gle.com>
Cc:     linuxarm@...wei.com, mauro.chehab@...wei.com,
        Mauro Carvalho Chehab <mchehab+huawei@...nel.org>,
        Krzysztof Wilczyński <kw@...ux.com>,
        Binghui Wang <wangbinghui@...ilicon.com>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Rob Herring <robh@...nel.org>,
        Xiaowei Song <songxiaowei@...ilicon.com>,
        linux-kernel@...r.kernel.org, linux-pci@...r.kernel.org
Subject: [PATCH v12 09/11] PCI: kirin: Add power_off support for Kirin 960 PHY

In order to prepare for module unload, add a power_off method
for HiKey 960.

Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@...nel.org>
---

To mailbombing on a large number of people, only mailing lists were C/C on the cover.
See [PATCH v12 00/11] at: https://lore.kernel.org/all/cover.1632814194.git.mchehab+huawei@kernel.org/

 drivers/pci/controller/dwc/pcie-kirin.c | 21 ++++++++++++++++++---
 1 file changed, 18 insertions(+), 3 deletions(-)

diff --git a/drivers/pci/controller/dwc/pcie-kirin.c b/drivers/pci/controller/dwc/pcie-kirin.c
index d5c29a266756..b17a194cf78d 100644
--- a/drivers/pci/controller/dwc/pcie-kirin.c
+++ b/drivers/pci/controller/dwc/pcie-kirin.c
@@ -343,6 +343,18 @@ static int hi3660_pcie_phy_init(struct platform_device *pdev,
 	return hi3660_pcie_phy_get_resource(phy);
 }
 
+static int hi3660_pcie_phy_power_off(struct kirin_pcie *pcie)
+{
+	struct hi3660_pcie_phy *phy = pcie->phy_priv;
+
+	/* Drop power supply for Host */
+	regmap_write(phy->sysctrl, SCTRL_PCIE_CMOS_OFFSET, 0x00);
+
+	hi3660_pcie_phy_clk_ctrl(phy, false);
+
+	return 0;
+}
+
 /*
  * The non-PHY part starts here
  */
@@ -560,7 +572,6 @@ static int kirin_pcie_add_bus(struct pci_bus *bus)
 	return 0;
 }
 
-
 static struct pci_ops kirin_pci_ops = {
 	.read = kirin_pcie_rd_own_conf,
 	.write = kirin_pcie_wr_own_conf,
@@ -714,8 +725,12 @@ static int kirin_pcie_power_on(struct platform_device *pdev,
 
 	return 0;
 err:
-	if (kirin_pcie->type != PCIE_KIRIN_INTERNAL_PHY)
+	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);
+	}
 
 	return ret;
 }
@@ -725,7 +740,7 @@ 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 0;
+		return hi3660_pcie_phy_power_off(kirin_pcie);
 
 	phy_power_off(kirin_pcie->phy);
 	phy_exit(kirin_pcie->phy);
-- 
2.31.1