linux-kernel - Re: [PATCHv9 07/12] PCI: mobiveil: Make mobiveil_host

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Message-ID: <20200113112655.GM42593@e119886-lin.cambridge.arm.com>
Date:   Mon, 13 Jan 2020 11:26:57 +0000
From:   Andrew Murray <andrew.murray@....com>
To:     "Z.q. Hou" <zhiqiang.hou@....com>
Cc:     "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>,
        "arnd@...db.de" <arnd@...db.de>,
        "mark.rutland@....com" <mark.rutland@....com>,
        "l.subrahmanya@...iveil.co.in" <l.subrahmanya@...iveil.co.in>,
        "shawnguo@...nel.org" <shawnguo@...nel.org>,
        "m.karthikeyan@...iveil.co.in" <m.karthikeyan@...iveil.co.in>,
        Leo Li <leoyang.li@....com>,
        "lorenzo.pieralisi@....com" <lorenzo.pieralisi@....com>,
        "catalin.marinas@....com" <catalin.marinas@....com>,
        "will.deacon@....com" <will.deacon@....com>,
        Mingkai Hu <mingkai.hu@....com>,
        "M.h. Lian" <minghuan.lian@....com>,
        Xiaowei Bao <xiaowei.bao@....com>
Subject: Re: [PATCHv9 07/12] PCI: mobiveil: Make mobiveil_host_init() can be
 used to re-init host

On Wed, Nov 20, 2019 at 03:46:03AM +0000, Z.q. Hou wrote:
> From: Hou Zhiqiang <Zhiqiang.Hou@....com>
> 
> Make the mobiveil_host_init() function can be used to re-init

Perhaps reword to "Allow the mobiveil_host_init() function to be
used to ...

> host controller's PAB and GPEX CSR register block, as NXP
> integrated Mobiveil IP has to reset and then re-init the PAB
> and GPEX CSR registers upon hot-reset.
> 
> Signed-off-by: Hou Zhiqiang <Zhiqiang.Hou@....com>
> Reviewed-by: Subrahmanya Lingappa <l.subrahmanya@...iveil.co.in>
> ---
> V9:
>  - No change
> 
>  .../controller/mobiveil/pcie-mobiveil-host.c  | 19 ++++++++++++-------
>  .../pci/controller/mobiveil/pcie-mobiveil.h   |  1 +
>  2 files changed, 13 insertions(+), 7 deletions(-)
> 
> diff --git a/drivers/pci/controller/mobiveil/pcie-mobiveil-host.c b/drivers/pci/controller/mobiveil/pcie-mobiveil-host.c
> index 3cd93df6fe6e..9bc3da036720 100644
> --- a/drivers/pci/controller/mobiveil/pcie-mobiveil-host.c
> +++ b/drivers/pci/controller/mobiveil/pcie-mobiveil-host.c
> @@ -221,18 +221,23 @@ static void mobiveil_pcie_enable_msi(struct mobiveil_pcie *pcie)
>  	writel_relaxed(1, pcie->apb_csr_base + MSI_ENABLE_OFFSET);
>  }
>  
> -static int mobiveil_host_init(struct mobiveil_pcie *pcie)
> +int mobiveil_host_init(struct mobiveil_pcie *pcie, bool reinit)
>  {
>  	struct root_port *rp = &pcie->rp;
>  	struct pci_host_bridge *bridge = rp->bridge;
>  	u32 value, pab_ctrl, type;
>  	struct resource_entry *win;
>  
> -	/* setup bus numbers */
> -	value = mobiveil_csr_readl(pcie, PCI_PRIMARY_BUS);
> -	value &= 0xff000000;
> -	value |= 0x00ff0100;
> -	mobiveil_csr_writel(pcie, value, PCI_PRIMARY_BUS);
> +	pcie->ib_wins_configured = 0;
> +	pcie->ob_wins_configured = 0;

This works so long as the number of bridge->windows never reduces. I
think this assumption holds true.

Thanks,

Andrew Murray

> +
> +	if (!reinit) {
> +		/* setup bus numbers */
> +		value = mobiveil_csr_readl(pcie, PCI_PRIMARY_BUS);
> +		value &= 0xff000000;
> +		value |= 0x00ff0100;
> +		mobiveil_csr_writel(pcie, value, PCI_PRIMARY_BUS);
> +	}
>  
>  	/*
>  	 * program Bus Master Enable Bit in Command Register in PAB Config
> @@ -569,7 +574,7 @@ int mobiveil_pcie_host_probe(struct mobiveil_pcie *pcie)
>  	 * configure all inbound and outbound windows and prepare the RC for
>  	 * config access
>  	 */
> -	ret = mobiveil_host_init(pcie);
> +	ret = mobiveil_host_init(pcie, false);
>  	if (ret) {
>  		dev_err(dev, "Failed to initialize host\n");
>  		return ret;
> diff --git a/drivers/pci/controller/mobiveil/pcie-mobiveil.h b/drivers/pci/controller/mobiveil/pcie-mobiveil.h
> index 95d2e7c809b8..37116c2a19fe 100644
> --- a/drivers/pci/controller/mobiveil/pcie-mobiveil.h
> +++ b/drivers/pci/controller/mobiveil/pcie-mobiveil.h
> @@ -166,6 +166,7 @@ struct mobiveil_pcie {
>  };
>  
>  int mobiveil_pcie_host_probe(struct mobiveil_pcie *pcie);
> +int mobiveil_host_init(struct mobiveil_pcie *pcie, bool reinit);
>  bool mobiveil_pcie_link_up(struct mobiveil_pcie *pcie);
>  int mobiveil_bringup_link(struct mobiveil_pcie *pcie);
>  void program_ob_windows(struct mobiveil_pcie *pcie, int win_num, u64 cpu_addr,
> -- 
> 2.17.1
>