From: Pali Rohár <pali@xxxxxxxxxx>
When unbinding driver, assert PERST# signal which prepares PCIe card for
power down. Then disable link training and PHY.
Fixes: 526a76991b7b ("PCI: aardvark: Implement driver 'remove' function and allow to build it as module")
Signed-off-by: Pali Rohár <pali@xxxxxxxxxx>
Signed-off-by: Marek Behún <kabel@xxxxxxxxxx>
Cc: stable@xxxxxxxxxxxxxxx
---
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 b3d89cb449b6..2a82c4652c28 100644
--- a/drivers/pci/controller/pci-aardvark.c
+++ b/drivers/pci/controller/pci-aardvark.c
@@ -1737,10 +1737,22 @@ 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 outbound address windows mapping */
for (i = 0; i < OB_WIN_COUNT; i++)
advk_pcie_disable_ob_win(pcie, i);
+ /* Disable phy */
+ advk_pcie_disable_phy(pcie);
+
return 0;
}
--
2.32.0
