[PATCH 5.15 112/135] PCI: aardvark: Mask all interrupts when unbinding driver

Greg Kroah-Hartman
2022-05-10T14:18:56Z

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From: Pali Rohár <pali@kernel.org>

commit 13bcdf07cb2ecff5d45d2c141df2539b15211448 upstream.

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>
Signed-off-by: Marek Behún <kabel@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
drivers/pci/controller/pci-aardvark.c | 21 +++++++++++++++++++++
1 file changed, 21 insertions(+)

--- a/drivers/pci/controller/pci-aardvark.c
+++ b/drivers/pci/controller/pci-aardvark.c
@@ -1693,6 +1693,27 @@ static int advk_pcie_remove(struct platf
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);