RE: [PATCHv9 06/12] PCI: mobiveil: Add callback function for link up check

Z.q. Hou
2020-02-06T13:25:31Z

Hi Andrew,

Thanks a lot for your review!

B.R,
Zhiqiang

> -----Original Message-----
> From: Andrew Murray <andrew.murray@arm.com>
> Sent: 2020年1月13日 19:22
> To: Z.q. Hou <zhiqiang.hou@nxp.com>
> Cc: linux-pci@vger.kernel.org; linux-arm-kernel@lists.infradead.org;
> devicetree@vger.kernel.org; linux-kernel@vger.kernel.org;
> bhelgaas@google.com; robh+dt@kernel.org; arnd@arndb.de;
> mark.rutland@arm.com; l.subrahmanya@mobiveil.co.in;
> shawnguo@kernel.org; m.karthikeyan@mobiveil.co.in; Leo Li
> <leoyang.li@nxp.com>; lorenzo.pieralisi@arm.com;
> catalin.marinas@arm.com; will.deacon@arm.com; Mingkai Hu
> <mingkai.hu@nxp.com>; M.h. Lian <minghuan.lian@nxp.com>; Xiaowei Bao
> <xiaowei.bao@nxp.com>
> Subject: Re: [PATCHv9 06/12] PCI: mobiveil: Add callback function for link up
> check
>
> On Wed, Nov 20, 2019 at 03:45:57AM +0000, Z.q. Hou wrote:
> > From: Hou Zhiqiang <Zhiqiang.Hou@nxp.com>
> >
> > The platforms, in which the Mobiveil GPEX is integrated, may have
> > their specific mechanism to check link up status.
> > This patch is to enable these platforms to implement theirs.
> >
> > Signed-off-by: Hou Zhiqiang <Zhiqiang.Hou@nxp.com>
> > ---
> > V9:
> > - New patch splited from the #1 of V8 patches to make it easy to review.
> >
> > drivers/pci/controller/mobiveil/pcie-mobiveil.c | 3 +++
> > drivers/pci/controller/mobiveil/pcie-mobiveil.h | 5 +++++
> > 2 files changed, 8 insertions(+)
> >
> > diff --git a/drivers/pci/controller/mobiveil/pcie-mobiveil.c
> > b/drivers/pci/controller/mobiveil/pcie-mobiveil.c
> > index 2773f823c9ea..b9ed2d95641c 100644
> > --- a/drivers/pci/controller/mobiveil/pcie-mobiveil.c
> > +++ b/drivers/pci/controller/mobiveil/pcie-mobiveil.c
> > @@ -125,6 +125,9 @@ void mobiveil_csr_write(struct mobiveil_pcie
> > *pcie, u32 val, u32 off,
> >
> > bool mobiveil_pcie_link_up(struct mobiveil_pcie *pcie) {
> > + if (pcie->ops->link_up)
> > + return pcie->ops->link_up(pcie);
> > +
> > return (mobiveil_csr_readl(pcie, LTSSM_STATUS) &
> > LTSSM_STATUS_L0_MASK) == LTSSM_STATUS_L0;
>
> On the previous patch I suggested that we don't mix up the link_up logic with
> the logic that decides which function to call. In this case the link_up logic is
> trivial. So this is probably OK.
>
> Reviewed-by: Andrew Murray <andrew.murray@arm.com>
>
> > }
> > diff --git a/drivers/pci/controller/mobiveil/pcie-mobiveil.h
> > b/drivers/pci/controller/mobiveil/pcie-mobiveil.h
> > index 18d85806a7fc..95d2e7c809b8 100644
> > --- a/drivers/pci/controller/mobiveil/pcie-mobiveil.h
> > +++ b/drivers/pci/controller/mobiveil/pcie-mobiveil.h
> > @@ -148,6 +148,10 @@ struct root_port {
> > struct pci_host_bridge *bridge;
> > };
> >
> > +struct mobiveil_pab_ops {
> > + int (*link_up)(struct mobiveil_pcie *pcie); };
> > +
> > struct mobiveil_pcie {
> > struct platform_device *pdev;
> > void __iomem *csr_axi_slave_base; /* root port config base */
> > @@ -157,6 +161,7 @@ struct mobiveil_pcie {
> > int ppio_wins;
> > int ob_wins_configured; /* configured outbound windows */
> > int ib_wins_configured; /* configured inbound windows */
> > + const struct mobiveil_pab_ops *ops;
> > struct root_port rp;
> > };
> >
> > --
> > 2.17.1
> >