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

From: Manivannan Sadhasivam <[email-masked]>
Date: Tue, 27 Feb 2024 18:02:30 +0530

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 <[email-masked]>
> > ---
> >  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."

- Mani

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