linux-kernel - RE: [PATCH V4 05/16] PCI: dwc: Move config space capability search API

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Date:   Wed, 24 Apr 2019 08:10:19 +0000
From:   Gustavo Pimentel <Gustavo.Pimentel@...opsys.com>
To:     Bjorn Helgaas <helgaas@...nel.org>, Vidya Sagar <vidyas@...dia.com>
CC:     "lorenzo.pieralisi@....com" <lorenzo.pieralisi@....com>,
        "robh+dt@...nel.org" <robh+dt@...nel.org>,
        "mark.rutland@....com" <mark.rutland@....com>,
        "thierry.reding@...il.com" <thierry.reding@...il.com>,
        "jonathanh@...dia.com" <jonathanh@...dia.com>,
        "kishon@...com" <kishon@...com>,
        "catalin.marinas@....com" <catalin.marinas@....com>,
        "will.deacon@....com" <will.deacon@....com>,
        "jingoohan1@...il.com" <jingoohan1@...il.com>,
        "gustavo.pimentel@...opsys.com" <Gustavo.Pimentel@...opsys.com>,
        "mperttunen@...dia.com" <mperttunen@...dia.com>,
        "linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-tegra@...r.kernel.org" <linux-tegra@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "kthota@...dia.com" <kthota@...dia.com>,
        "mmaddireddy@...dia.com" <mmaddireddy@...dia.com>,
        "sagar.tv@...il.com" <sagar.tv@...il.com>
Subject: RE: [PATCH V4 05/16] PCI: dwc: Move config space capability search
 API

On Tue, Apr 23, 2019 at 21:32:44, Bjorn Helgaas <helgaas@...nel.org> 
wrote:

> On Tue, Apr 23, 2019 at 01:57:19PM +0530, Vidya Sagar wrote:
> > Move PCIe config space capability search API to common DesignWare file
> > as this can be used by both host and ep mode codes.
> > 
> > Signed-off-by: Vidya Sagar <vidyas@...dia.com>
> > Acked-by: Gustavo Pimentel <gustavo.pimentel@...opsys.com>
> > ---
> > Changes from [v3]:
> > * Rebased to linux-next top of the tree
> > 
> > Changes from [v2]:
> > * None
> > 
> > Changes from [v1]:
> > * Removed dw_pcie_find_next_ext_capability() API from here and made a
> >   separate patch for that
> > 
> >  drivers/pci/controller/dwc/pcie-designware.c | 33 ++++++++++++++++++++
> >  drivers/pci/controller/dwc/pcie-designware.h |  2 ++
> 
> You claim this is a "move", but I only see adds.  Where did it move
> *from*?

I'm guessing something was lost during the rebase. On v3 version, the 
removal  was there.

> 
> While you're at it, can you add a comment in the code about why we
> can't use the regular pci_find_capability() interface?  It's really a
> shame to have to reimplement that.
> 
> >  2 files changed, 35 insertions(+)
> > 
> > diff --git a/drivers/pci/controller/dwc/pcie-designware.c b/drivers/pci/controller/dwc/pcie-designware.c
> > index 8e0081ccf83b..6a98135244d6 100644
> > --- a/drivers/pci/controller/dwc/pcie-designware.c
> > +++ b/drivers/pci/controller/dwc/pcie-designware.c
> > @@ -20,6 +20,39 @@
> >  #define PCIE_PHY_DEBUG_R1_LINK_UP	(0x1 << 4)
> >  #define PCIE_PHY_DEBUG_R1_LINK_IN_TRAINING	(0x1 << 29)
> >  
> > +static u8 __dw_pcie_find_next_cap(struct dw_pcie *pci, u8 cap_ptr,
> > +				  u8 cap)
> > +{
> > +	u8 cap_id, next_cap_ptr;
> > +	u16 reg;
> > +
> > +	reg = dw_pcie_readw_dbi(pci, cap_ptr);
> > +	next_cap_ptr = (reg & 0xff00) >> 8;
> > +	cap_id = (reg & 0x00ff);
> > +
> > +	if (!next_cap_ptr || cap_id > PCI_CAP_ID_MAX)
> > +		return 0;
> > +
> > +	if (cap_id == cap)
> > +		return cap_ptr;
> > +
> > +	return __dw_pcie_find_next_cap(pci, next_cap_ptr, cap);
> > +}
> > +
> > +u8 dw_pcie_find_capability(struct dw_pcie *pci, u8 cap)
> > +{
> > +	u8 next_cap_ptr;
> > +	u16 reg;
> > +
> > +	reg = dw_pcie_readw_dbi(pci, PCI_CAPABILITY_LIST);
> > +	next_cap_ptr = (reg & 0x00ff);
> > +
> > +	if (!next_cap_ptr)
> > +		return 0;
> > +
> > +	return __dw_pcie_find_next_cap(pci, next_cap_ptr, cap);
> > +}
> > +
> >  int dw_pcie_read(void __iomem *addr, int size, u32 *val)
> >  {
> >  	if (!IS_ALIGNED((uintptr_t)addr, size)) {
> > diff --git a/drivers/pci/controller/dwc/pcie-designware.h b/drivers/pci/controller/dwc/pcie-designware.h
> > index 9ee98ced1ef6..35160b4ce929 100644
> > --- a/drivers/pci/controller/dwc/pcie-designware.h
> > +++ b/drivers/pci/controller/dwc/pcie-designware.h
> > @@ -248,6 +248,8 @@ struct dw_pcie {
> >  #define to_dw_pcie_from_ep(endpoint)   \
> >  		container_of((endpoint), struct dw_pcie, ep)
> >  
> > +u8 dw_pcie_find_capability(struct dw_pcie *pci, u8 cap);
> > +
> >  int dw_pcie_read(void __iomem *addr, int size, u32 *val);
> >  int dw_pcie_write(void __iomem *addr, int size, u32 val);
> >  
> > -- 
> > 2.17.1
> >