[PATCH v13 08/10] PCI: kirin: Add power_off support for Kirin 960 PHY

From: Mauro Carvalho Chehab
Date: Mon Oct 18 2021 - 03:08:09 EST


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

Acked-by: Xiaowei Song <songxiaowei@xxxxxxxxxxxxx>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@xxxxxxxxxx>
---

See [PATCH v13 00/10] at: https://lore.kernel.org/all/cover.1634539769.git.mchehab+huawei@xxxxxxxxxx/

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