Subject: [PATCH 29/42] PCI: aardvark: Reset PCIe card and disable PHY when unbinding driver

From: Pali Rohár <[email-masked]>
Date: Thu, 6 May 2021 17:31:40 +0200

When unbinding driver, assert PERST# signal which prepares PCIe card for
power down. Then disable link training and PHY.

Signed-off-by: Pali Rohár <[email-masked]>
Reviewed-by: Marek Behún <[email-masked]>
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

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