Subject: [PATCH v2 16/23] PCI: aardvark: Add support for PME interrupts

From: Marek Behún <[email-masked]>
Date: Mon, 10 Jan 2022 02:50:11 +0100

From: Pali Rohár <[email-masked]>

Currently enabling PCI_EXP_RTSTA_PME bit in PCI_EXP_RTCTL register does
nothing. This is because PCIe PME driver expects to receive PCIe interrupt
defined in PCI_EXP_FLAGS_IRQ register, but aardvark hardware does not
trigger PCIe INTx/MSI interrupt for PME event, rather it triggers custom
aardvark interrupt which this driver is not processing yet.

Fix this issue by handling PME interrupt in advk_pcie_handle_int() and
chaining it to PCIe interrupt 0 with generic_handle_domain_irq() (since
aardvark sets PCI_EXP_FLAGS_IRQ to zero). With this change PCIe PME driver
finally starts receiving PME interrupt.

Signed-off-by: Pali Rohár <[email-masked]>
Signed-off-by: Marek Behún <[email-masked]>
---
 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 e7b9ca31c79c..3f2d570bfbb5 100644
--- a/drivers/pci/controller/pci-aardvark.c
+++ b/drivers/pci/controller/pci-aardvark.c
@@ -1487,6 +1487,18 @@ static void advk_pcie_handle_int(struct advk_pcie *pcie)
 	isr1_mask = advk_readl(pcie, PCIE_ISR1_MASK_REG);
 	isr1_status = isr1_val & ((~isr1_mask) & PCIE_ISR1_ALL_MASK);
 
+	/* Process PME interrupt */
+	if (isr0_status & PCIE_MSG_PM_PME_MASK) {
+		/*
+		 * Do not clear PME interrupt bit in ISR0, it is cleared by IRQ
+		 * receiver by writing to the PCI_EXP_RTSTA register of emulated
+		 * root bridge. Aardvark HW returns zero for PCI_EXP_FLAGS_IRQ,
+		 * so use PCIe interrupt 0.
+		 */
+		if (generic_handle_domain_irq(pcie->irq_domain, 0) == -EINVAL)
+			dev_err_ratelimited(&pcie->pdev->dev, "unhandled PME IRQ\n");
+	}
+
 	/* Process ERR interrupt */
 	if (isr0_status & PCIE_ISR0_ERR_MASK) {
 		advk_writel(pcie, PCIE_ISR0_ERR_MASK, PCIE_ISR0_REG);
-- 
2.34.1

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