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

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Date:   Thu, 6 Feb 2020 13:27:35 +0000
From:   "Z.q. Hou" <zhiqiang.hou@....com>
To:     Andrew Murray <andrew.murray@....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

Hi Andrew,

Thanks a lot for your comments!

> -----Original Message-----
> From: Andrew Murray <andrew.murray@....com>
> Sent: 2020年1月13日 19:27
> To: Z.q. 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; arnd@...db.de;
> mark.rutland@....com; l.subrahmanya@...iveil.co.in;
> shawnguo@...nel.org; m.karthikeyan@...iveil.co.in; Leo Li
> <leoyang.li@....com>; lorenzo.pieralisi@....com;
> catalin.marinas@....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 ...
> 

Thanks a lot for your suggestion, will change in v10.

Thanks,
Zhiqiang

> > 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
> >