RE: [PATCHv9 03/12] PCI: mobiveil: Collect the interrupt related operations into a routine

[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 18:35
> 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 03/12] PCI: mobiveil: Collect the interrupt related
> operations into a routine
> 
> On Wed, Nov 20, 2019 at 03:45:37AM +0000, Z.q. Hou wrote:
> > From: Hou Zhiqiang <Zhiqiang.Hou@xxxxxxx>
> >
> > Collect the interrupt initialization related operations into a new
> > routine to make it more readable.
> 
> I prefer the word 'function' instead of routine. Also indicate why, not only is it
> nicer but it is in preparation for EP support.

Will replace the 'routine' with 'function', it is only used in RC mode, not used in EP mode.

> 
> >
> > 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/pcie-mobiveil.c | 65
> > +++++++++++++++++---------
> >  1 file changed, 42 insertions(+), 23 deletions(-)
> >
> > diff --git a/drivers/pci/controller/pcie-mobiveil.c
> > b/drivers/pci/controller/pcie-mobiveil.c
> > index 97f682ca7c7a..512b27a0536e 100644
> > --- a/drivers/pci/controller/pcie-mobiveil.c
> > +++ b/drivers/pci/controller/pcie-mobiveil.c
> > @@ -454,12 +454,6 @@ static int mobiveil_pcie_parse_dt(struct
> mobiveil_pcie *pcie)
> >  		return PTR_ERR(pcie->csr_axi_slave_base);
> >  	pcie->pcie_reg_base = res->start;
> >
> > -	/* 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);
> > -	if (IS_ERR(pcie->apb_csr_base))
> > -		return PTR_ERR(pcie->apb_csr_base);
> > -
> >  	/* read the number of windows requested */
> >  	if (of_property_read_u32(node, "apio-wins", &pcie->apio_wins))
> >  		pcie->apio_wins = MAX_PIO_WINDOWS;
> > @@ -467,12 +461,6 @@ static int mobiveil_pcie_parse_dt(struct
> mobiveil_pcie *pcie)
> >  	if (of_property_read_u32(node, "ppio-wins", &pcie->ppio_wins))
> >  		pcie->ppio_wins = MAX_PIO_WINDOWS;
> >
> > -	rp->irq = platform_get_irq(pdev, 0);
> > -	if (rp->irq <= 0) {
> > -		dev_err(dev, "failed to map IRQ: %d\n", rp->irq);
> > -		return -ENODEV;
> > -	}
> > -
> >  	return 0;
> >  }
> >
> > @@ -618,9 +606,6 @@ static int mobiveil_host_init(struct mobiveil_pcie
> *pcie)
> >  	pab_ctrl |= (1 << AMBA_PIO_ENABLE_SHIFT) | (1 <<
> PEX_PIO_ENABLE_SHIFT);
> >  	mobiveil_csr_writel(pcie, pab_ctrl, PAB_CTRL);
> >
> > -	mobiveil_csr_writel(pcie, (PAB_INTP_INTX_MASK |
> PAB_INTP_MSI_MASK),
> > -			    PAB_INTP_AMBA_MISC_ENB);
> > -
> >  	/*
> >  	 * program PIO Enable Bit to 1 and Config Window Enable Bit to 1 in
> >  	 * PAB_AXI_PIO_CTRL Register
> > @@ -670,9 +655,6 @@ static int mobiveil_host_init(struct mobiveil_pcie
> *pcie)
> >  	value |= (PCI_CLASS_BRIDGE_PCI << 16);
> >  	mobiveil_csr_writel(pcie, value, PAB_INTP_AXI_PIO_CLASS);
> >
> > -	/* setup MSI hardware registers */
> > -	mobiveil_pcie_enable_msi(pcie);
> > -
> >  	return 0;
> >  }
> >
> > @@ -873,6 +855,46 @@ static int mobiveil_pcie_init_irq_domain(struct
> mobiveil_pcie *pcie)
> >  	return 0;
> >  }
> >
> > +static int mobiveil_pcie_interrupt_init(struct mobiveil_pcie *pcie) {
> > +	struct platform_device *pdev = pcie->pdev;
> > +	struct device *dev = &pdev->dev;
> > +	struct root_port *rp = &pcie->rp;
> > +	struct resource *res;
> > +	int ret;
> > +
> > +	/* 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);
> > +	if (IS_ERR(pcie->apb_csr_base))
> > +		return PTR_ERR(pcie->apb_csr_base);
> > +
> > +	/* setup MSI hardware registers */
> > +	mobiveil_pcie_enable_msi(pcie);
> 
> Does this need to come after mobiveil_pcie_init_irq_domain - given that this
> function sets up the irq domain for MSI?

No, I don't think so, because I didn't change the relative order of the 2 functions
you mentioned.

Thanks,
Zhiqiang

> 
> Thanks,
> 
> Andrew Murray
> 
> > +
> > +	rp->irq = platform_get_irq(pdev, 0);
> > +	if (rp->irq <= 0) {
> > +		dev_err(dev, "failed to map IRQ: %d\n", rp->irq);
> > +		return -ENODEV;
> > +	}
> > +
> > +	/* initialize the IRQ domains */
> > +	ret = mobiveil_pcie_init_irq_domain(pcie);
> > +	if (ret) {
> > +		dev_err(dev, "Failed creating IRQ Domain\n");
> > +		return ret;
> > +	}
> > +
> > +	irq_set_chained_handler_and_data(rp->irq, mobiveil_pcie_isr, pcie);
> > +
> > +	/* Enable interrupts */
> > +	mobiveil_csr_writel(pcie, (PAB_INTP_INTX_MASK |
> PAB_INTP_MSI_MASK),
> > +			    PAB_INTP_AMBA_MISC_ENB);
> > +
> > +
> > +	return 0;
> > +}
> > +
> >  int mobiveil_pcie_host_probe(struct mobiveil_pcie *pcie)  {
> >  	struct root_port *rp = &pcie->rp;
> > @@ -906,15 +928,12 @@ int mobiveil_pcie_host_probe(struct
> mobiveil_pcie *pcie)
> >  		return ret;
> >  	}
> >
> > -	/* initialize the IRQ domains */
> > -	ret = mobiveil_pcie_init_irq_domain(pcie);
> > +	ret = mobiveil_pcie_interrupt_init(pcie);
> >  	if (ret) {
> > -		dev_err(dev, "Failed creating IRQ Domain\n");
> > +		dev_err(dev, "Interrupt init failed\n");
> >  		return ret;
> >  	}
> >
> > -	irq_set_chained_handler_and_data(rp->irq, mobiveil_pcie_isr, pcie);
> > -
> >  	/* Initialize bridge */
> >  	bridge->dev.parent = dev;
> >  	bridge->sysdata = pcie;
> > --
> > 2.17.1
> >