diff options
Diffstat (limited to 'target/linux/generic/pending-5.10/850-0016-PCI-aardvark-Add-support-for-PME-interrupts.patch')
| -rw-r--r-- | target/linux/generic/pending-5.10/850-0016-PCI-aardvark-Add-support-for-PME-interrupts.patch | 52 |
1 files changed, 52 insertions, 0 deletions
diff --git a/target/linux/generic/pending-5.10/850-0016-PCI-aardvark-Add-support-for-PME-interrupts.patch b/target/linux/generic/pending-5.10/850-0016-PCI-aardvark-Add-support-for-PME-interrupts.patch new file mode 100644 index 0000000000..76ed7e60a4 --- /dev/null +++ b/target/linux/generic/pending-5.10/850-0016-PCI-aardvark-Add-support-for-PME-interrupts.patch @@ -0,0 +1,52 @@ +From 7acd8ef92e8789e10b5d736d73cea3b625087f26 Mon Sep 17 00:00:00 2001 +From: =?UTF-8?q?Pali=20Roh=C3=A1r?= <pali@kernel.org> +Date: Wed, 8 Dec 2021 06:07:44 +0100 +Subject: [PATCH] PCI: aardvark: Add support for PME interrupts +MIME-Version: 1.0 +Content-Type: text/plain; charset=UTF-8 +Content-Transfer-Encoding: 8bit + +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 <pali@kernel.org> +Signed-off-by: Marek Behún <kabel@kernel.org> +--- + drivers/pci/controller/pci-aardvark.c | 13 +++++++++++++ + 1 file changed, 13 insertions(+) + +diff --git a/drivers/pci/controller/pci-aardvark.c b/drivers/pci/controller/pci-aardvark.c +index efd7e53b5e06..e2b66b0e8fb3 100644 +--- a/drivers/pci/controller/pci-aardvark.c ++++ b/drivers/pci/controller/pci-aardvark.c +@@ -1489,6 +1489,19 @@ 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. ++ */ ++ virq = irq_find_mapping(pcie->irq_domain, 0); ++ if (generic_handle_irq(virq) == -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 + |