linux-kernel - Re: [PATCHv10 09/13] PCI: mobiveil: Add Header Type field check

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Message-ID: <20200220173115.GJ19388@big-machine>
Date:   Thu, 20 Feb 2020 17:31:15 +0000
From:   Andrew Murray <amurray@...goodpenguin.co.uk>
To:     Zhiqiang Hou <Zhiqiang.Hou@....com>
Cc:     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, andrew.murray@....com,
        arnd@...db.de, mark.rutland@....com, l.subrahmanya@...iveil.co.in,
        shawnguo@...nel.org, m.karthikeyan@...iveil.co.in,
        leoyang.li@....com, lorenzo.pieralisi@....com,
        catalin.marinas@....com, will.deacon@....com, Mingkai.Hu@....com,
        Minghuan.Lian@....com, Xiaowei.Bao@....com
Subject: Re: [PATCHv10 09/13] PCI: mobiveil: Add Header Type field check

On Thu, Feb 13, 2020 at 12:06:40PM +0800, Zhiqiang Hou wrote:
> From: Hou Zhiqiang <Zhiqiang.Hou@....com>
> 
> Check the Header Type and exit from the host driver initialization if
> it is not in host mode.
> 
> Signed-off-by: Hou Zhiqiang <Zhiqiang.Hou@....com>

Reviewed-by: Andrew Murray <amurray@...goodpenguin.co.uk>

> ---
> V10:
>  - New patch separated from #10 of v9.
> 
>  .../pci/controller/mobiveil/pcie-mobiveil-host.c    | 13 +++++++++++++
>  1 file changed, 13 insertions(+)
> 
> diff --git a/drivers/pci/controller/mobiveil/pcie-mobiveil-host.c b/drivers/pci/controller/mobiveil/pcie-mobiveil-host.c
> index 44dd641fede3..db7028788d91 100644
> --- a/drivers/pci/controller/mobiveil/pcie-mobiveil-host.c
> +++ b/drivers/pci/controller/mobiveil/pcie-mobiveil-host.c
> @@ -554,6 +554,16 @@ static int mobiveil_pcie_interrupt_init(struct mobiveil_pcie *pcie)
>  	return mobiveil_pcie_integrated_interrupt_init(pcie);
>  }
>  
> +static bool mobiveil_pcie_is_bridge(struct mobiveil_pcie *pcie)
> +{
> +	u32 header_type;
> +
> +	header_type = mobiveil_csr_readb(pcie, PCI_HEADER_TYPE);
> +	header_type &= 0x7f;
> +
> +	return header_type == PCI_HEADER_TYPE_BRIDGE;
> +}
> +
>  int mobiveil_pcie_host_probe(struct mobiveil_pcie *pcie)
>  {
>  	struct mobiveil_root_port *rp = &pcie->rp;
> @@ -569,6 +579,9 @@ int mobiveil_pcie_host_probe(struct mobiveil_pcie *pcie)
>  		return ret;
>  	}
>  
> +	if (!mobiveil_pcie_is_bridge(pcie))
> +		return -ENODEV;
> +
>  	/* parse the host bridge base addresses from the device tree file */
>  	ret = pci_parse_request_of_pci_ranges(dev, &bridge->windows,
>  					      &bridge->dma_ranges, NULL);
> -- 
> 2.17.1
>