linux-kernel - [PATCHv4 18/28] PCI: mobiveil: add link up condition check

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Message-ID: <20190311093130.7209-19-Zhiqiang.Hou@nxp.com>
Date:   Mon, 11 Mar 2019 09:32:22 +0000
From:   "Z.q. Hou" <zhiqiang.hou@....com>
To:     "linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "bhelgaas@...gle.com" <bhelgaas@...gle.com>,
        "robh+dt@...nel.org" <robh+dt@...nel.org>,
        "mark.rutland@....com" <mark.rutland@....com>,
        "l.subrahmanya@...iveil.co.in" <l.subrahmanya@...iveil.co.in>,
        "shawnguo@...nel.org" <shawnguo@...nel.org>,
        Leo Li <leoyang.li@....com>,
        "lorenzo.pieralisi@....com" <lorenzo.pieralisi@....com>,
        "catalin.marinas@....com" <catalin.marinas@....com>,
        "will.deacon@....com" <will.deacon@....com>
CC:     Mingkai Hu <mingkai.hu@....com>,
        "M.h. Lian" <minghuan.lian@....com>,
        Xiaowei Bao <xiaowei.bao@....com>,
        "Z.q. Hou" <zhiqiang.hou@....com>
Subject: [PATCHv4 18/28] PCI: mobiveil: add link up condition check

From: Hou Zhiqiang <Zhiqiang.Hou@....com>

Avoid to issue CFG transactions to link partner when the PCIe
link is not up.

Signed-off-by: Hou Zhiqiang <Zhiqiang.Hou@....com>
---
V4:
 - Splited from the 17th patch

 drivers/pci/controller/mobiveil/pcie-mobiveil-host.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/pci/controller/mobiveil/pcie-mobiveil-host.c b/drivers/pci/controller/mobiveil/pcie-mobiveil-host.c
index 74a14f05115e..1ae82e790562 100644
--- a/drivers/pci/controller/mobiveil/pcie-mobiveil-host.c
+++ b/drivers/pci/controller/mobiveil/pcie-mobiveil-host.c
@@ -29,6 +29,10 @@ static bool mobiveil_pcie_valid_device(struct pci_bus *bus, unsigned int devfn)
 {
 	struct mobiveil_pcie *pcie = bus->sysdata;
 
+	/* If there is no link, then there is no device */
+	if (bus->number > pcie->rp.root_bus_nr && !mobiveil_pcie_link_up(pcie))
+		return false;
+
 	/* Only one device down on each root port */
 	if ((bus->number == pcie->rp.root_bus_nr) && (devfn > 0))
 		return false;
-- 
2.17.1