linux-kernel - [PATCH v2 05/10] PCI: keystone: Add ks_pcie_free_msi

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Message-ID: <20250912122356.3326888-6-s-vadapalli@ti.com>
Date: Fri, 12 Sep 2025 17:46:16 +0530
From: Siddharth Vadapalli <s-vadapalli@...com>
To: <lpieralisi@...nel.org>, <kwilczynski@...nel.org>, <mani@...nel.org>,
        <robh@...nel.org>, <bhelgaas@...gle.com>, <jingoohan1@...il.com>,
        <christian.bruel@...s.st.com>, <qiang.yu@....qualcomm.com>,
        <mayank.rana@....qualcomm.com>, <thippeswamy.havalige@....com>,
        <shradha.t@...sung.com>, <quic_schintav@...cinc.com>,
        <inochiama@...il.com>, <cassel@...nel.org>, <kishon@...nel.org>,
        <sergio.paracuellos@...il.com>, <18255117159@....com>,
        <rongqianfeng@...o.com>
CC: <jirislaby@...nel.org>, <linux-pci@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <linux-arm-kernel@...ts.infradead.org>,
        <srk@...com>, <s-vadapalli@...com>
Subject: [PATCH v2 05/10] PCI: keystone: Add ks_pcie_free_msi_irq() helper for cleanup

Introduce the helper function ks_pcie_free_msi_irq() which will undo the
configuration performed by the ks_pcie_config_msi_irq() function. This will
be required for implementing a future helper function to undo the
configuration performed by the ks_pcie_host_init() function.

Signed-off-by: Siddharth Vadapalli <s-vadapalli@...com>
---

v1: https://lore.kernel.org/r/20250903124505.365913-6-s-vadapalli@ti.com/
No changes since v1.

 drivers/pci/controller/dwc/pci-keystone.c | 25 +++++++++++++++++++++++
 1 file changed, 25 insertions(+)

diff --git a/drivers/pci/controller/dwc/pci-keystone.c b/drivers/pci/controller/dwc/pci-keystone.c
index d03e95bf7d54..81c3686688c0 100644
--- a/drivers/pci/controller/dwc/pci-keystone.c
+++ b/drivers/pci/controller/dwc/pci-keystone.c
@@ -666,6 +666,31 @@ static void ks_pcie_intx_irq_handler(struct irq_desc *desc)
 	chained_irq_exit(chip, desc);
 }
 
+static void ks_pcie_free_msi_irq(struct keystone_pcie *ks_pcie)
+{
+	struct device_node *np = ks_pcie->np;
+	struct device_node *intc_np;
+	int irq_count, irq, i;
+
+	if (!IS_ENABLED(CONFIG_PCI_MSI))
+		return;
+
+	/* Nothing to do if MSI Interrupt Controller does not exist */
+	intc_np = of_get_child_by_name(np, "msi-interrupt-controller");
+	if (!intc_np)
+		return;
+
+	/* irq_count should be non-zero. Else, ks_pcie_host_init would have failed. */
+	irq_count = of_irq_count(intc_np);
+
+	for (i = 0; i < irq_count; i++) {
+		/* We expect to get an irq since it succeeded during 'config'. */
+		irq = irq_of_parse_and_map(intc_np, i);
+		irq_set_chained_handler(irq, NULL);
+	}
+	of_node_put(intc_np);
+}
+
 static int ks_pcie_config_msi_irq(struct keystone_pcie *ks_pcie)
 {
 	struct device *dev = ks_pcie->pci->dev;
-- 
2.43.0