Re: [PATCH v8 09/10] PCI: qcom-ep: Use the generic dw_pcie_ep_linkdown() API to handle LINK_DOWN event

Manivannan Sadhasivam
2024-02-27T18:48:18Z

On Tue, Feb 27, 2024 at 12:34:15PM -0500, Frank Li wrote:
> On Tue, Feb 27, 2024 at 06:02:30PM +0530, Manivannan Sadhasivam wrote:
> > On Mon, Feb 26, 2024 at 12:20:41PM -0500, Frank Li wrote:
> > > On Sat, Feb 24, 2024 at 12:24:15PM +0530, Manivannan Sadhasivam wrote:
> > > > Now that the API is available, let's make use of it. It also handles the
> > > > reinitialization of DWC non-sticky registers in addition to sending the
> > > > notification to EPF drivers.
> > > >
> > > > Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
> > > > ---
> > > > drivers/pci/controller/dwc/pcie-qcom-ep.c | 2 +-
> > > > 1 file changed, 1 insertion(+), 1 deletion(-)
> > > >
> > > > diff --git a/drivers/pci/controller/dwc/pcie-qcom-ep.c b/drivers/pci/controller/dwc/pcie-qcom-ep.c
> > > > index 2fb8c15e7a91..4e45bc4bca45 100644
> > > > --- a/drivers/pci/controller/dwc/pcie-qcom-ep.c
> > > > +++ b/drivers/pci/controller/dwc/pcie-qcom-ep.c
> > > > @@ -640,7 +640,7 @@ static irqreturn_t qcom_pcie_ep_global_irq_thread(int irq, void *data)
> > > > if (FIELD_GET(PARF_INT_ALL_LINK_DOWN, status)) {
> > > > dev_dbg(dev, "Received Linkdown event\n");
> > > > pcie_ep->link_status = QCOM_PCIE_EP_LINK_DOWN;
> > > > - pci_epc_linkdown(pci->ep.epc);
> > > > + dw_pcie_ep_linkdown(&pci->ep);
> > >
> > > Suppose pci_epc_linkdown() will call dw_pcie_ep_linkdown() ?
> > > why need direct call dw_pcie_ep_linkdown() here?
> > >
> >
> > I've already justified this in the commit message. Here is the excerpt:
> >
> > "It also handles the reinitialization of DWC non-sticky registers in addition
> > to sending the notification to EPF drivers."
>
> API function name is too similar. It is hard to know difference from API
> naming. It'd better to know what function do from function name.
>

In reality we cannot name a function based on everything it does. The naming is
mostly based on what is the primary motive of the API and here it is handling
Link down event. Maybe dw_pcie_ep_handle_linkdown() would be an apt one, but
that's out of scope of this series (since changing that would also require
changes to other similar APIs).

- Mani

> Frank
> >
> > - Mani
> >
> > --
> > மணிவண்ணன் சதாசிவம்

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