PCI: aardvark: Mask all interrupts when unbinding driver

Ensure that no interrupt can be triggered after driver unbind.

Link: https://lore.kernel.org/r/20211130172913.9727-8-kabel@kernel.org
Signed-off-by: Pali Rohár <pali@kernel.org>
Signed-off-by: Marek Behún <kabel@kernel.org>
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>

diff --git a/drivers/pci/controller/pci-aardvark.c b/drivers/pci/controller/pci-aardvark.c
index 12eae05..08b34ac 100644 (file)
--- a/drivers/pci/controller/pci-aardvark.c
+++ b/drivers/pci/controller/pci-aardvark.c
@@ -1709,6 +1709,27 @@ static int advk_pcie_remove(struct platform_device *pdev)
        val &= ~(PCI_COMMAND_IO | PCI_COMMAND_MEMORY | PCI_COMMAND_MASTER);
        advk_writel(pcie, val, PCIE_CORE_CMD_STATUS_REG);
 
+       /* Disable MSI */
+       val = advk_readl(pcie, PCIE_CORE_CTRL2_REG);
+       val &= ~PCIE_CORE_CTRL2_MSI_ENABLE;
+       advk_writel(pcie, val, PCIE_CORE_CTRL2_REG);
+
+       /* Clear MSI address */
+       advk_writel(pcie, 0, PCIE_MSI_ADDR_LOW_REG);
+       advk_writel(pcie, 0, PCIE_MSI_ADDR_HIGH_REG);
+
+       /* Mask all interrupts */
+       advk_writel(pcie, PCIE_MSI_ALL_MASK, PCIE_MSI_MASK_REG);
+       advk_writel(pcie, PCIE_ISR0_ALL_MASK, PCIE_ISR0_MASK_REG);
+       advk_writel(pcie, PCIE_ISR1_ALL_MASK, PCIE_ISR1_MASK_REG);
+       advk_writel(pcie, PCIE_IRQ_ALL_MASK, HOST_CTRL_INT_MASK_REG);
+
+       /* Clear all interrupts */
+       advk_writel(pcie, PCIE_MSI_ALL_MASK, PCIE_MSI_STATUS_REG);
+       advk_writel(pcie, PCIE_ISR0_ALL_MASK, PCIE_ISR0_REG);
+       advk_writel(pcie, PCIE_ISR1_ALL_MASK, PCIE_ISR1_REG);
+       advk_writel(pcie, PCIE_IRQ_ALL_MASK, HOST_CTRL_INT_STATUS_REG);
+
        /* Remove IRQ domains */
        advk_pcie_remove_msi_irq_domain(pcie);
        advk_pcie_remove_irq_domain(pcie);