linux-kernel - [PATCH AUTOSEL 6.1 9/9] PCI: fu740: Set the number of MSI vectors

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Date:   Fri,  8 Sep 2023 20:23:00 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Yong-Xuan Wang <yongxuan.wang@...ive.com>,
        Lorenzo Pieralisi <lpieralisi@...nel.org>,
        Serge Semin <fancer.lancer@...il.com>,
        Sasha Levin <sashal@...nel.org>, paul.walmsley@...ive.com,
        greentime.hu@...ive.com, kw@...ux.com, bhelgaas@...gle.com,
        linux-pci@...r.kernel.org
Subject: [PATCH AUTOSEL 6.1 9/9] PCI: fu740: Set the number of MSI vectors

From: Yong-Xuan Wang <yongxuan.wang@...ive.com>

[ Upstream commit 551a60e1225e71fff8efd9390204c505b0870e0f ]

The iMSI-RX module of the DW PCIe controller provides multiple sets of
MSI_CTRL_INT_i_* registers, and each set is capable of handling 32 MSI
interrupts. However, the fu740 PCIe controller driver only enabled one set
of MSI_CTRL_INT_i_* registers, as the total number of supported interrupts
was not specified.

Set the supported number of MSI vectors to enable all the MSI_CTRL_INT_i_*
registers on the fu740 PCIe core, allowing the system to fully utilize the
available MSI interrupts.

Link: https://lore.kernel.org/r/20230807055621.2431-1-yongxuan.wang@sifive.com
Signed-off-by: Yong-Xuan Wang <yongxuan.wang@...ive.com>
Signed-off-by: Lorenzo Pieralisi <lpieralisi@...nel.org>
Reviewed-by: Serge Semin <fancer.lancer@...il.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/pci/controller/dwc/pcie-fu740.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/pci/controller/dwc/pcie-fu740.c b/drivers/pci/controller/dwc/pcie-fu740.c
index 0c90583c078bf..1e9b44b8bba48 100644
--- a/drivers/pci/controller/dwc/pcie-fu740.c
+++ b/drivers/pci/controller/dwc/pcie-fu740.c
@@ -299,6 +299,7 @@ static int fu740_pcie_probe(struct platform_device *pdev)
 	pci->dev = dev;
 	pci->ops = &dw_pcie_ops;
 	pci->pp.ops = &fu740_pcie_host_ops;
+	pci->pp.num_vectors = MAX_MSI_IRQS;
 
 	/* SiFive specific region: mgmt */
 	afp->mgmt_base = devm_platform_ioremap_resource_byname(pdev, "mgmt");
-- 
2.40.1