linux-kernel - [PATCH v3 1/2] PCI: layerscape: Add support for Link down notification

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Date:   Wed, 19 Jul 2023 11:57:06 -0400
From:   Frank Li <Frank.Li@....com>
To:     markus.elfring@....de, lpieralisi@...nel.org
Cc:     Frank.Li@....com, Zhiqiang.Hou@....com, bhelgaas@...gle.com,
        imx@...ts.linux.dev, kernel-janitors@...r.kernel.org, kw@...ux.com,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-pci@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
        mani@...nel.org, minghuan.Lian@....com, mingkai.hu@....com,
        robh@...nel.org, roy.zang@....com, xiaowei.bao@....com
Subject: [PATCH v3 1/2] PCI: layerscape: Add support for Link down notification

Add support to pass Link down notification to Endpoint function driver
so that the LINK_DOWN event can be processed by the function.

Acked-by: Manivannan Sadhasivam <mani@...nel.org>
Signed-off-by: Frank Li <Frank.Li@....com>
---
Change from v2 to v3
 - none
Change from v1 to v2
 - move pci_epc_linkdown() after dev_dbg()

 drivers/pci/controller/dwc/pci-layerscape-ep.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/pci/controller/dwc/pci-layerscape-ep.c b/drivers/pci/controller/dwc/pci-layerscape-ep.c
index de4c1758a6c3..e0969ff2ddf7 100644
--- a/drivers/pci/controller/dwc/pci-layerscape-ep.c
+++ b/drivers/pci/controller/dwc/pci-layerscape-ep.c
@@ -89,6 +89,7 @@ static irqreturn_t ls_pcie_ep_event_handler(int irq, void *dev_id)
 		dev_dbg(pci->dev, "Link up\n");
 	} else if (val & PEX_PF0_PME_MES_DR_LDD) {
 		dev_dbg(pci->dev, "Link down\n");
+		pci_epc_linkdown(pci->ep.epc);
 	} else if (val & PEX_PF0_PME_MES_DR_HRD) {
 		dev_dbg(pci->dev, "Hot reset\n");
 	}
-- 
2.34.1