When unbinding driver, assert PERST# signal which prepares PCIe card for
power down. Then disable link training and PHY.
Signed-off-by: Pali Rohár <pali@xxxxxxxxxx>
Reviewed-by: Marek Behún <kabel@xxxxxxxxxx>
Fixes: 526a76991b7b ("PCI: aardvark: Implement driver 'remove' function and allow to build it as module")
---
drivers/pci/controller/pci-aardvark.c | 12 ++++++++++++
1 file changed, 12 insertions(+)
diff --git a/drivers/pci/controller/pci-aardvark.c b/drivers/pci/controller/pci-aardvark.c
index 4b531675db81..b1e6a8a839e0 100644
--- a/drivers/pci/controller/pci-aardvark.c
+++ b/drivers/pci/controller/pci-aardvark.c
@@ -1494,6 +1494,18 @@ static int advk_pcie_remove(struct platform_device *pdev)
/* Free config space for emulated root bridge */
pci_bridge_emul_cleanup(&pcie->bridge);
+ /* Assert PERST# signal which prepares PCIe card for power down */
+ if (pcie->reset_gpio)
+ gpiod_set_value_cansleep(pcie->reset_gpio, 1);
+
+ /* Disable link training */
+ val = advk_readl(pcie, PCIE_CORE_CTRL0_REG);
+ val &= ~LINK_TRAINING_EN;
+ advk_writel(pcie, val, PCIE_CORE_CTRL0_REG);
+
+ /* Disable phy */
+ advk_pcie_disable_phy(pcie);
+
return 0;
}
--
2.20.1
