> -----Original Message-----
> From: Manivannan Sadhasivam <manivannan.sadhasivam@xxxxxxxxxx>
> Sent: Saturday, May 6, 2023 2:59 AM
> To: Frank Li <frank.li@xxxxxxx>
> Cc: M.H. Lian <minghuan.lian@xxxxxxx>; Mingkai Hu
> <mingkai.hu@xxxxxxx>; Roy Zang <roy.zang@xxxxxxx>; Lorenzo Pieralisi
> <lpieralisi@xxxxxxxxxx>; Rob Herring <robh@xxxxxxxxxx>; Krzysztof
> Wilczyński <kw@xxxxxxxxx>; Bjorn Helgaas <bhelgaas@xxxxxxxxxx>; open
> list:PCI DRIVER FOR FREESCALE LAYERSCAPE <linuxppc-dev@xxxxxxxxxxxxxxxx>;
> open list:PCI DRIVER FOR FREESCALE LAYERSCAPE <linux-
> pci@xxxxxxxxxxxxxxx>; moderated list:PCI DRIVER FOR FREESCALE
> LAYERSCAPE <linux-arm-kernel@xxxxxxxxxxxxxxxxxxx>; open list <linux-
> kernel@xxxxxxxxxxxxxxx>; imx@xxxxxxxxxxxxxxx
> Subject: [EXT] Re: [PATCH v2 1/1] PCI: layerscape: Add the endpoint linkup
> notifier support
>
> Caution: This is an external email. Please take care when clicking links or
> opening attachments. When in doubt, report the message using the 'Report
> this email' button
>
>
> On Mon, May 01, 2023 at 10:48:06AM -0400, Frank Li wrote:
> > Layerscape has PME interrupt, which can be used as linkup notifier.
> > Set CFG_READY bit when linkup detected.
>
> Where are you setting this bit?
>
> >
> > Signed-off-by: Xiaowei Bao <xiaowei.bao@xxxxxxx>
> > Signed-off-by: Frank Li <Frank.Li@xxxxxxx>
> > ---
> > Change from v1 to v2
> > - pme -> PME
> > - irq -> IRQ
> > - update dev_info message according to Bjorn's suggestion
> > - remove '.' at error message
> >
> > .../pci/controller/dwc/pci-layerscape-ep.c | 104 +++++++++++++++++-
> > 1 file changed, 103 insertions(+), 1 deletion(-)
> >
> > diff --git a/drivers/pci/controller/dwc/pci-layerscape-ep.c
> b/drivers/pci/controller/dwc/pci-layerscape-ep.c
> > index c640db60edc6..e974fbe3b6d8 100644
> > --- a/drivers/pci/controller/dwc/pci-layerscape-ep.c
> > +++ b/drivers/pci/controller/dwc/pci-layerscape-ep.c
> > @@ -18,6 +18,20 @@
> >
> > #include "pcie-designware.h"
> >
> > +#define PEX_PF0_CONFIG 0xC0014
> > +#define PEX_PF0_CFG_READY BIT(0)
> > +
> > +/* PEX PFa PCIE PME and message interrupt registers*/
> > +#define PEX_PF0_PME_MES_DR 0xC0020
> > +#define PEX_PF0_PME_MES_DR_LUD BIT(7)
> > +#define PEX_PF0_PME_MES_DR_LDD BIT(9)
> > +#define PEX_PF0_PME_MES_DR_HRD BIT(10)
> > +
> > +#define PEX_PF0_PME_MES_IER 0xC0028
> > +#define PEX_PF0_PME_MES_IER_LUDIE BIT(7)
> > +#define PEX_PF0_PME_MES_IER_LDDIE BIT(9)
> > +#define PEX_PF0_PME_MES_IER_HRDIE BIT(10)
> > +
> > #define to_ls_pcie_ep(x) dev_get_drvdata((x)->dev)
> >
> > struct ls_pcie_ep_drvdata {
> > @@ -30,8 +44,88 @@ struct ls_pcie_ep {
> > struct dw_pcie *pci;
> > struct pci_epc_features *ls_epc;
> > const struct ls_pcie_ep_drvdata *drvdata;
> > + bool big_endian;
> > + int irq;
> > };
> >
> > +static u32 ls_lut_readl(struct ls_pcie_ep *pcie, u32 offset)
> > +{
> > + struct dw_pcie *pci = pcie->pci;
> > +
> > + if (pcie->big_endian)
> > + return ioread32be(pci->dbi_base + offset);
> > + else
> > + return ioread32(pci->dbi_base + offset);
> > +}
> > +
> > +static void ls_lut_writel(struct ls_pcie_ep *pcie, u32 offset,
> > + u32 value)
>
> Above function argument could be wrapped within 80 columns.
>
> > +{
> > + struct dw_pcie *pci = pcie->pci;
> > +
> > + if (pcie->big_endian)
> > + iowrite32be(value, pci->dbi_base + offset);
> > + else
> > + iowrite32(value, pci->dbi_base + offset);
> > +}
> > +
> > +static irqreturn_t ls_pcie_ep_event_handler(int irq, void *dev_id)
> > +{
> > + struct ls_pcie_ep *pcie = (struct ls_pcie_ep *)dev_id;
>
> No need to do explicit typecase for void pointer.
>
> > + struct dw_pcie *pci = pcie->pci;
> > + u32 val, cfg;
> > +
> > + val = ls_lut_readl(pcie, PEX_PF0_PME_MES_DR);
> > + if (!val)
> > + return IRQ_NONE;
> > +
> > + if (val & PEX_PF0_PME_MES_DR_LUD) {
> > + cfg = ls_lut_readl(pcie, PEX_PF0_CONFIG);
> > + cfg |= PEX_PF0_CFG_READY;
> > + ls_lut_writel(pcie, PEX_PF0_CONFIG, cfg);
> > + dw_pcie_ep_linkup(&pci->ep);
> > +
> > + dev_info(pci->dev, "Link up\n");
>
> These messages could be demoted to dev_dbg() logs.
>
> > + } else if (val & PEX_PF0_PME_MES_DR_LDD) {
> > + dev_info(pci->dev, "Link down\n");
> > + } else if (val & PEX_PF0_PME_MES_DR_HRD) {
> > + dev_info(pci->dev, "Hot reset\n");
> > + }
> > +
> > + ls_lut_writel(pcie, PEX_PF0_PME_MES_DR, val);
>
> You should clear the interrupts before processing.
>
> > +
> > + return IRQ_HANDLED;
> > +}
> > +
> > +static int ls_pcie_ep_interrupt_init(struct ls_pcie_ep *pcie,
> > + struct platform_device *pdev)
> > +{
> > + u32 val;
> > + int ret;
> > +
> > + pcie->irq = platform_get_irq_byname(pdev, "pme");
> > + if (pcie->irq < 0) {
> > + dev_err(&pdev->dev, "Can't get 'pme' IRQ\n");
>
> PME
Here should be dts property `pme`, suppose should match
platform_get_irq_byname(pdev, "pme");
>
> > + return pcie->irq;
> > + }
> > +
> > + ret = devm_request_irq(&pdev->dev, pcie->irq,
> > + ls_pcie_ep_event_handler, IRQF_SHARED,
> > + pdev->name, pcie);
>
> Again, please wrap to fit the 80 column width.
>
> > + if (ret) {
> > + dev_err(&pdev->dev, "Can't register PCIe IRQ\n");
> > + return ret;
> > + }
> > +
> > + /* Enable interrupts */
> > + val = ls_lut_readl(pcie, PEX_PF0_PME_MES_IER);
> > + val |= PEX_PF0_PME_MES_IER_LDDIE |
> PEX_PF0_PME_MES_IER_HRDIE |
> > + PEX_PF0_PME_MES_IER_LUDIE;
> > + ls_lut_writel(pcie, PEX_PF0_PME_MES_IER, val);
> > +
> > + return 0;
> > +}
> > +
> > static const struct pci_epc_features*
> > ls_pcie_ep_get_features(struct dw_pcie_ep *ep)
> > {
> > @@ -125,6 +219,7 @@ static int __init ls_pcie_ep_probe(struct
> platform_device *pdev)
> > struct ls_pcie_ep *pcie;
> > struct pci_epc_features *ls_epc;
> > struct resource *dbi_base;
> > + int ret;
> >
> > pcie = devm_kzalloc(dev, sizeof(*pcie), GFP_KERNEL);
> > if (!pcie)
> > @@ -144,6 +239,7 @@ static int __init ls_pcie_ep_probe(struct
> platform_device *pdev)
> > pci->ops = pcie->drvdata->dw_pcie_ops;
> >
> > ls_epc->bar_fixed_64bit = (1 << BAR_2) | (1 << BAR_4);
> > + ls_epc->linkup_notifier = true;
> >
> > pcie->pci = pci;
> > pcie->ls_epc = ls_epc;
> > @@ -155,9 +251,15 @@ static int __init ls_pcie_ep_probe(struct
> platform_device *pdev)
> >
> > pci->ep.ops = &ls_pcie_ep_ops;
> >
> > + pcie->big_endian = of_property_read_bool(dev->of_node, "big-
> endian");
> > +
> > platform_set_drvdata(pdev, pcie);
> >
> > - return dw_pcie_ep_init(&pci->ep);
> > + ret = dw_pcie_ep_init(&pci->ep);
> > + if (ret)
> > + return ret;
>
> Double space after return.
>
> > +
> > + return ls_pcie_ep_interrupt_init(pcie, pdev);
>
> Double space after return.
>
> - Mani
>
> > }
> >
> > static struct platform_driver ls_pcie_ep_driver = {
> > --
> > 2.34.1
> >
>
> --
> மணிவண்ணன் சதாசிவம்
