linux-kernel - RE: [PATCHv2 12/25] PCI: mobiveil: move out the link up waiting from mobiveil_host

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Date:   Tue, 20 Nov 2018 11:01:49 +0000
From:   "M.h. Lian" <minghuan.lian@....com>
To:     "Z.q. Hou" <zhiqiang.hou@....com>,
        "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>, Xiaowei Bao <xiaowei.bao@....com>
Subject: RE: [PATCHv2 12/25] PCI: mobiveil: move out the link up waiting from
 mobiveil_host_init

reviewed-by: Minghuan Lian <Minghuan.Lian@....com>

> -----Original Message-----
> From: Z.q. Hou
> Sent: Tuesday, November 20, 2018 5:27 PM
> To: linux-pci@...r.kernel.org; linux-arm-kernel@...ts.infradead.org;
> devicetree@...r.kernel.org; linux-kernel@...r.kernel.org;
> bhelgaas@...gle.com; robh+dt@...nel.org; mark.rutland@....com;
> l.subrahmanya@...iveil.co.in; shawnguo@...nel.org; Leo Li
> <leoyang.li@....com>; lorenzo.pieralisi@....com;
> catalin.marinas@....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: [PATCHv2 12/25] PCI: mobiveil: move out the link up waiting from
> mobiveil_host_init
> 
> From: Hou Zhiqiang <Zhiqiang.Hou@....com>
> 
> Host initial sequence does not depend on PCIe link up, so move it to the
> place just before the enumeration.
> 
> Signed-off-by: Hou Zhiqiang <Zhiqiang.Hou@....com>
> ---
> V2:
>  - no change
> 
>  drivers/pci/controller/pcie-mobiveil.c | 15 +++++++--------
>  1 file changed, 7 insertions(+), 8 deletions(-)
> 
> diff --git a/drivers/pci/controller/pcie-mobiveil.c
> b/drivers/pci/controller/pcie-mobiveil.c
> index 8eee1ab7ee24..c2848c22b466 100644
> --- a/drivers/pci/controller/pcie-mobiveil.c
> +++ b/drivers/pci/controller/pcie-mobiveil.c
> @@ -582,15 +582,8 @@ static void mobiveil_pcie_enable_msi(struct
> mobiveil_pcie *pcie)  static int mobiveil_host_init(struct mobiveil_pcie *pcie)
> {
>  	u32 value, pab_ctrl, type;
> -	int err;
>  	struct resource_entry *win;
> 
> -	err = mobiveil_bringup_link(pcie);
> -	if (err) {
> -		dev_info(&pcie->pdev->dev, "link bring-up failed\n");
> -		return err;
> -	}
> -
>  	/*
>  	 * program Bus Master Enable Bit in Command Register in PAB Config
>  	 * Space
> @@ -662,7 +655,7 @@ static int mobiveil_host_init(struct mobiveil_pcie
> *pcie)
>  	/* setup MSI hardware registers */
>  	mobiveil_pcie_enable_msi(pcie);
> 
> -	return err;
> +	return 0;
>  }
> 
>  static void mobiveil_mask_intx_irq(struct irq_data *data) @@ -922,6
> +915,12 @@ static int mobiveil_pcie_probe(struct platform_device *pdev)
>  	bridge->map_irq = of_irq_parse_and_map_pci;
>  	bridge->swizzle_irq = pci_common_swizzle;
> 
> +	ret = mobiveil_bringup_link(pcie);
> +	if (ret) {
> +		dev_info(dev, "link bring-up failed\n");
> +		goto error;
> +	}
> +
>  	/* setup the kernel resources for the newly added PCIe root bus */
>  	ret = pci_scan_root_bus_bridge(bridge);
>  	if (ret)
> --
> 2.17.1