RE: [PATCHv9 05/12] PCI: mobiveil: Add callback function for interrupt initialization

[Z.q. Hou]

Hi Andrew,

Thanks a lot for your comments!

> -----Original Message-----
> From: Andrew Murray <andrew.murray@xxxxxxx>
> Sent: 2020年1月13日 19:20
> To: Z.q. Hou <zhiqiang.hou@xxxxxxx>
> Cc: linux-pci@xxxxxxxxxxxxxxx; linux-arm-kernel@xxxxxxxxxxxxxxxxxxx;
> devicetree@xxxxxxxxxxxxxxx; linux-kernel@xxxxxxxxxxxxxxx;
> bhelgaas@xxxxxxxxxx; robh+dt@xxxxxxxxxx; arnd@xxxxxxxx;
> mark.rutland@xxxxxxx; l.subrahmanya@xxxxxxxxxxxxxx;
> shawnguo@xxxxxxxxxx; m.karthikeyan@xxxxxxxxxxxxxx; Leo Li
> <leoyang.li@xxxxxxx>; lorenzo.pieralisi@xxxxxxx;
> catalin.marinas@xxxxxxx; will.deacon@xxxxxxx; Mingkai Hu
> <mingkai.hu@xxxxxxx>; M.h. Lian <minghuan.lian@xxxxxxx>; Xiaowei Bao
> <xiaowei.bao@xxxxxxx>
> Subject: Re: [PATCHv9 05/12] PCI: mobiveil: Add callback function for
> interrupt initialization
> 
> On Wed, Nov 20, 2019 at 03:45:50AM +0000, Z.q. Hou wrote:
> > From: Hou Zhiqiang <Zhiqiang.Hou@xxxxxxx>
> >
> > The Mobiveil GPEX internal MSI/INTx controller may not be used by
> > other platforms in which the Mobiveil GPEX is integrated.
> > This patch is to allow these platforms to implement their specific
> > interrupt initialization.
> >
> > Signed-off-by: Hou Zhiqiang <Zhiqiang.Hou@xxxxxxx>
> > ---
> > V9:
> >  - New patch splited from the #1 of V8 patches to make it easy to review.
> >
> >  drivers/pci/controller/mobiveil/pcie-mobiveil-host.c | 3 +++
> >  drivers/pci/controller/mobiveil/pcie-mobiveil.h      | 7 +++++++
> >  2 files changed, 10 insertions(+)
> >
> > diff --git a/drivers/pci/controller/mobiveil/pcie-mobiveil-host.c
> > b/drivers/pci/controller/mobiveil/pcie-mobiveil-host.c
> > index 2cc424e78d33..3cd93df6fe6e 100644
> > --- a/drivers/pci/controller/mobiveil/pcie-mobiveil-host.c
> > +++ b/drivers/pci/controller/mobiveil/pcie-mobiveil-host.c
> > @@ -507,6 +507,9 @@ static int mobiveil_pcie_interrupt_init(struct
> mobiveil_pcie *pcie)
> >  	struct resource *res;
> >  	int ret;
> >
> > +	if (rp->ops->interrupt_init)
> > +		return rp->ops->interrupt_init(pcie);
> > +
> 
> This may be cleaner if you have a helper function named
> "mobiveil_pcie_interrupt_init" where it either calls interrupt_init if present or
> calls this current function renamed to
> "mobiveil_pcie_integrated_interrupt_init"
> or similar.
> 
> A bit like the DWC dw_pcie_rd_own_conf function.

Good suggestion! Will change in v10.

Thanks,
Zhiqiang

> 
> Thanks,
> 
> Andrew Murray
> 
> >  	/* map MSI config resource */
> >  	res = platform_get_resource_byname(pdev, IORESOURCE_MEM,
> "apb_csr");
> >  	pcie->apb_csr_base = devm_pci_remap_cfg_resource(dev, res); diff
> > --git a/drivers/pci/controller/mobiveil/pcie-mobiveil.h
> > b/drivers/pci/controller/mobiveil/pcie-mobiveil.h
> > index e3148078e9dd..18d85806a7fc 100644
> > --- a/drivers/pci/controller/mobiveil/pcie-mobiveil.h
> > +++ b/drivers/pci/controller/mobiveil/pcie-mobiveil.h
> > @@ -130,10 +130,17 @@ struct mobiveil_msi {			/* MSI
> information */
> >  	DECLARE_BITMAP(msi_irq_in_use, PCI_NUM_MSI);  };
> >
> > +struct mobiveil_pcie;
> > +
> > +struct mobiveil_rp_ops {
> > +	int (*interrupt_init)(struct mobiveil_pcie *pcie); };
> > +
> >  struct root_port {
> >  	char root_bus_nr;
> >  	void __iomem *config_axi_slave_base;	/* endpoint config base */
> >  	struct resource *ob_io_res;
> > +	struct mobiveil_rp_ops *ops;
> >  	int irq;
> >  	raw_spinlock_t intx_mask_lock;
> >  	struct irq_domain *intx_domain;
> > --
> > 2.17.1
> >