| From | Pali Rohár <> | Subject | [PATCH 29/42] PCI: aardvark: Reset PCIe card and disable PHY when unbinding driver | Date | Thu, 6 May 2021 17:31:40 +0200 |
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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@kernel.org> Reviewed-by: Marek Behún <kabel@kernel.org> 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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