linux-kernel - Re: [PATCHv5 19/20] PCI: mobiveil: Add 8-bit and 16-bit register accessors

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Message-ID: <20190617092901.GB18020@e121166-lin.cambridge.arm.com>
Date:   Mon, 17 Jun 2019 10:29:01 +0100
From:   Lorenzo Pieralisi <lorenzo.pieralisi@....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>,
        "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>,
        "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: [PATCHv5 19/20] PCI: mobiveil: Add 8-bit and 16-bit register
 accessors

On Sat, Jun 15, 2019 at 01:13:48AM +0000, Z.q. Hou wrote:
> Hi Lorenzo,
> 
> > -----Original Message-----
> > From: Lorenzo Pieralisi [mailto:lorenzo.pieralisi@....com]
> > Sent: 2019年6月12日 21:54
> > 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; mark.rutland@....com;
> > l.subrahmanya@...iveil.co.in; shawnguo@...nel.org; Leo Li
> > <leoyang.li@....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: [PATCHv5 19/20] PCI: mobiveil: Add 8-bit and 16-bit register
> > accessors
> > 
> > On Fri, Apr 12, 2019 at 08:37:05AM +0000, Z.q. Hou wrote:
> > > From: Hou Zhiqiang <Zhiqiang.Hou@....com>
> > >
> > > There are some 8-bit and 16-bit registers in PCIe configuration space,
> > > so add accessors for them.
> > >
> > > Signed-off-by: Hou Zhiqiang <Zhiqiang.Hou@....com>
> > > Reviewed-by: Minghuan Lian <Minghuan.Lian@....com>
> > > Reviewed-by: Subrahmanya Lingappa <l.subrahmanya@...iveil.co.in>
> > > ---
> > > V5:
> > >  - Corrected and retouched the subject and changelog.
> > >  - No functionality change.
> > >
> > >  drivers/pci/controller/pcie-mobiveil.c | 20 ++++++++++++++++++++
> > >  1 file changed, 20 insertions(+)
> > >
> > > diff --git a/drivers/pci/controller/pcie-mobiveil.c
> > > b/drivers/pci/controller/pcie-mobiveil.c
> > > index 411e9779da12..456adfee393c 100644
> > > --- a/drivers/pci/controller/pcie-mobiveil.c
> > > +++ b/drivers/pci/controller/pcie-mobiveil.c
> > > @@ -268,11 +268,31 @@ static u32 csr_readl(struct mobiveil_pcie *pcie,
> > u32 off)
> > >  	return csr_read(pcie, off, 0x4);
> > >  }
> > >
> > > +static u32 csr_readw(struct mobiveil_pcie *pcie, u32 off) {
> > > +	return csr_read(pcie, off, 0x2);
> > > +}
> > > +
> > > +static u32 csr_readb(struct mobiveil_pcie *pcie, u32 off) {
> > > +	return csr_read(pcie, off, 0x1);
> > > +}
> > > +
> > >  static void csr_writel(struct mobiveil_pcie *pcie, u32 val, u32 off)
> > > {
> > >  	csr_write(pcie, val, off, 0x4);
> > >  }
> > >
> > > +static void csr_writew(struct mobiveil_pcie *pcie, u32 val, u32 off)
> > > +{
> > > +	csr_write(pcie, val, off, 0x2);
> > > +}
> > > +
> > > +static void csr_writeb(struct mobiveil_pcie *pcie, u32 val, u32 off)
> > > +{
> > > +	csr_write(pcie, val, off, 0x1);
> > > +}
> > > +
> > 
> > They are not used so you should drop this patch.
> 
> NXP Layerscape PCIe Gen4 controller driver will use them, so don't
> drop it.

You add functions when they are needed, so drop this patch and
squash it to the patch that use these functions.

Lorenzo

> Thanks,
> Zhiqiang
> 
> > 
> > Lorenzo
> > 
> > >  static bool mobiveil_pcie_link_up(struct mobiveil_pcie *pcie)  {
> > >  	return (csr_readl(pcie, LTSSM_STATUS) &
> > > --
> > > 2.17.1
> > >