linux-kernel - Re: [PATCH V4 2/6] PCI: tegra: Map configuration space as nGnRnE

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Date:   Thu, 3 Dec 2020 18:26:46 +0530
From:   Vidya Sagar <vidyas@...dia.com>
To:     Thierry Reding <thierry.reding@...il.com>
CC:     "lorenzo.pieralisi@....com" <lorenzo.pieralisi@....com>,
        "robh+dt@...nel.org" <robh+dt@...nel.org>,
        "bhelgaas@...gle.com" <bhelgaas@...gle.com>,
        Jonathan Hunter <jonathanh@...dia.com>,
        "amanharitsh123@...il.com" <amanharitsh123@...il.com>,
        "dinghao.liu@....edu.cn" <dinghao.liu@....edu.cn>,
        "kw@...ux.com" <kw@...ux.com>,
        "linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
        "linux-tegra@...r.kernel.org" <linux-tegra@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Krishna Thota <kthota@...dia.com>,
        Manikanta Maddireddy <mmaddireddy@...dia.com>,
        "sagar.tv@...il.com" <sagar.tv@...il.com>
Subject: Re: [PATCH V4 2/6] PCI: tegra: Map configuration space as nGnRnE



> -----Original Message-----
> From: Thierry Reding <thierry.reding@...il.com>
> Sent: Thursday, November 26, 2020 5:04 PM
> To: Vidya Sagar <vidyas@...dia.com>
> Cc: lorenzo.pieralisi@....com; robh+dt@...nel.org; bhelgaas@...gle.com;
> Jonathan Hunter <jonathanh@...dia.com>; amanharitsh123@...il.com;
> dinghao.liu@....edu.cn; kw@...ux.com; linux-pci@...r.kernel.org; linux-
> tegra@...r.kernel.org; linux-kernel@...r.kernel.org; Krishna Thota
> <kthota@...dia.com>; Manikanta Maddireddy <mmaddireddy@...dia.com>;
> sagar.tv@...il.com
> Subject: Re: [PATCH V4 2/6] PCI: tegra: Map configuration space as nGnRnE
> 
> On Mon, Nov 09, 2020 at 10:49:33PM +0530, Vidya Sagar wrote:
> > As specified in the comment for pci_remap_cfgspace() define in
> > arch/arm64/include/asm/io.h file, PCIe configuration space should be
> > mapped as nGnRnE. Hence changing to dev_pci_remap_cfgspace() from
> > devm_ioremap_resource() for mapping DBI space as that is nothing but
> > the root port's own configuration space.
> >
> > Signed-off-by: Vidya Sagar <vidyas@...dia.com>
> > ---
> > V4:
> > * None
> >
> > V3:
> > * None
> >
> > V2:
> > * Changed 'Strongly Ordered' to 'nGnRnE'
> >
> >  drivers/pci/controller/dwc/pcie-tegra194.c | 4 +++-
> >  1 file changed, 3 insertions(+), 1 deletion(-)
> >
> > diff --git a/drivers/pci/controller/dwc/pcie-tegra194.c
> > b/drivers/pci/controller/dwc/pcie-tegra194.c
> > index b172b1d49713..7a0c64436861 100644
> > --- a/drivers/pci/controller/dwc/pcie-tegra194.c
> > +++ b/drivers/pci/controller/dwc/pcie-tegra194.c
> > @@ -2108,7 +2108,9 @@ static int tegra_pcie_dw_probe(struct
> platform_device *pdev)
> >  	}
> >  	pcie->dbi_res = dbi_res;
> >
> > -	pci->dbi_base = devm_ioremap_resource(dev, dbi_res);
> > +	pci->dbi_base = devm_pci_remap_cfgspace(dev,
> > +						dbi_res->start,
> > +						resource_size(dbi_res));
> >  	if (IS_ERR(pci->dbi_base))
> >  		return PTR_ERR(pci->dbi_base);
> >
> 
> Similarly to patch 1/6, this is no longer required because it's already part of one
> of Rob's earlier patches, so this, too, can be dropped.
Yes. This patch is not required now. I'll drop it from the next patch 
series.

Thanks,
Vidya Sagar
> 
> Thierry