Hi Subbu,
Thanks a lot for your comments!
> -----Original Message-----
> From: Subrahmanya Lingappa <l.subrahma...@mobiveil.co.in>
> Sent: 2019年2月8日 20:41
> To: Z.q. Hou <zhiqiang....@nxp.com>
> Cc: linux-...@vger.kernel.org; linux-arm-ker...@lists.infradead.org;
> devicet...@vger.kernel.org; linux-kernel@vger.kernel.org;
> bhelg...@google.com; robh...@kernel.org; mark.rutl...@arm.com;
> shawn...@kernel.org; Leo Li <leoyang...@nxp.com>;
> lorenzo.pieral...@arm.com; catalin.mari...@arm.com;
> will.dea...@arm.com; Mingkai Hu <mingkai...@nxp.com>; M.h. Lian
> <minghuan.l...@nxp.com>; Xiaowei Bao <xiaowei....@nxp.com>
> Subject: Re: [PATCHv3 17/27] PCI: mobiveil: fix the checking of valid device
>
> ZQ,
>
> On Tue, Jan 29, 2019 at 1:40 PM Z.q. Hou <zhiqiang....@nxp.com> wrote:
> >
> > From: Hou Zhiqiang <zhiqiang....@nxp.com>
> >
> > Avoid to issue CFG transactions to link partner when the PCIe link is
> > not up. And allow CFG transactions to all functions of Endpoint
> > implemented multiple functions.
> >
> > Fixes: 9af6bcb11e12 ("PCI: mobiveil: Add Mobiveil PCIe Host Bridge IP
> > driver")
> > Signed-off-by: Hou Zhiqiang <zhiqiang....@nxp.com>
> > Reviewed-by: Minghuan Lian <minghuan.l...@nxp.com>
> > ---
> > V3:
> > - No change
> >
> > drivers/pci/controller/mobiveil/pcie-mobiveil-host.c | 6 +++++-
> > 1 file changed, 5 insertions(+), 1 deletion(-)
> >
> > diff --git a/drivers/pci/controller/mobiveil/pcie-mobiveil-host.c
> > b/drivers/pci/controller/mobiveil/pcie-mobiveil-host.c
> > index dc5324d94466..1ae82e790562 100644
> > --- a/drivers/pci/controller/mobiveil/pcie-mobiveil-host.c
> > +++ b/drivers/pci/controller/mobiveil/pcie-mobiveil-host.c
> > @@ -29,6 +29,10 @@ static bool mobiveil_pcie_valid_device(struct
> > pci_bus *bus, unsigned int devfn) {
> > struct mobiveil_pcie *pcie = bus->sysdata;
> >
> > + /* If there is no link, then there is no device */
> > + if (bus->number > pcie->rp.root_bus_nr
> && !mobiveil_pcie_link_up(pcie))
> > + return false;
> > +
> > /* Only one device down on each root port */
> > if ((bus->number == pcie->rp.root_bus_nr) && (devfn > 0))
> > return false;
> > @@ -37,7 +41,7 @@ static bool mobiveil_pcie_valid_device(struct pci_bus
> *bus, unsigned int devfn)
> > * Do not read more than one device on the bus directly
> > * attached to RC
> > */
> > - if ((bus->primary == pcie->rp.root_bus_nr) && (devfn > 0))
> > + if ((bus->primary == pcie->rp.root_bus_nr) && (PCI_SLOT(devfn)
> > + > 0))
> here change "primary" to "number", as it's a bug in the original driver too.
No, I think it should not change to "number", as this is to check the EP
directly attached to RC, so if we change it to "bus->number", the
"pcie->rp.root_bus_nr" should be changed to "pcie->rp.root_bus_nr +1"
correspondingly.
>
> > return false;
> >
> > return true;
> > --
> > 2.17.1
> >
Thanks,
Zhiqiang
