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| author |   Pali Rohár <pali@kernel.org> | 2022-01-10 02:50:11 +0100 |
|---|---|---|
| committer |   Lorenzo Pieralisi <lorenzo.pieralisi@arm.com> | 2022-02-08 10:44:20 +0000 |
| commit | 0fc75d87454195885bd1a81fc7e6ce92572b6109 (patch) | |
| tree | a07fbdafb295720a7f502c1ac04c90f66926f016 /drivers/pci/controller/pci-aardvark.c | |
| parent | PCI: aardvark: Optimize writing PCI_EXP_RTCTL_PMEIE and PCI_EXP_RTSTA_PME on emulated bridge (diff) | |
| download | linux-dev-0fc75d87454195885bd1a81fc7e6ce92572b6109.tar.xz linux-dev-0fc75d87454195885bd1a81fc7e6ce92572b6109.zip | |
PCI: aardvark: Add support for PME interrupts
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.
Link: https://lore.kernel.org/r/20220110015018.26359-17-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>
Diffstat (limited to 'drivers/pci/controller/pci-aardvark.c')
| -rw-r--r-- | drivers/pci/controller/pci-aardvark.c | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/drivers/pci/controller/pci-aardvark.c b/drivers/pci/controller/pci-aardvark.c index 2ae43992cd06..8020dfb8f00e 100644 --- a/drivers/pci/controller/pci-aardvark.c +++ b/drivers/pci/controller/pci-aardvark.c @@ -1478,6 +1478,18 @@ 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); |