Re: [PATCH v18 13/20] PCI: dwc: Introduce .ep_pre_init() and .ep_deinit()

[Serge Semin <fancer.lancer@gmail.com>]

On Wed, Jul 26, 2023 at 03:02:13AM +0000, Yoshihiro Shimoda wrote:
> Hi Manivannan,
> 
> > From: Manivannan Sadhasivam, Sent: Monday, July 24, 2023 8:40 PM
> > 
> > On Fri, Jul 21, 2023 at 04:44:45PM +0900, Yoshihiro Shimoda wrote:
> > > Renesas R-Car Gen4 PCIe controllers require vender-specific
> > > initialization before .ep_init(). To use dw->dbi and dw->num-lanes
> > > in the initialization code, introduce .ep_pre_init() into struct
> > > dw_pcie_ep_ops. Also introduce .ep_deinit() to disable the controller
> > > by using vender-specific de-initialization.
> > >
> > > Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
> > > ---
> > >  drivers/pci/controller/dwc/pcie-designware-ep.c | 6 ++++++
> > >  drivers/pci/controller/dwc/pcie-designware.h    | 2 ++
> > >  2 files changed, 8 insertions(+)
> > >
> > > diff --git a/drivers/pci/controller/dwc/pcie-designware-ep.c b/drivers/pci/controller/dwc/pcie-designware-ep.c
> > > index 14c641395c3b..52b3e7f67513 100644
> > > --- a/drivers/pci/controller/dwc/pcie-designware-ep.c
> > > +++ b/drivers/pci/controller/dwc/pcie-designware-ep.c
> > > @@ -684,6 +684,9 @@ void dw_pcie_ep_exit(struct dw_pcie_ep *ep)
> > >  	struct dw_pcie *pci = to_dw_pcie_from_ep(ep);
> > >  	struct pci_epc *epc = ep->epc;
> > >
> > > +	if (ep->ops->ep_deinit)
> > > +		ep->ops->ep_deinit(ep);
> > > +
> > >  	dw_pcie_edma_remove(pci);
> > >
> > >  	if (ep->intx_mem)
> > > @@ -797,6 +800,9 @@ int dw_pcie_ep_init(struct dw_pcie_ep *ep)
> > >  	ep->phys_base = res->start;
> > >  	ep->addr_size = resource_size(res);
> > >
> > > +	if (ep->ops->ep_pre_init)
> > > +		ep->ops->ep_pre_init(ep);
> > > +
> > >  	dw_pcie_version_detect(pci);
> > >
> > >  	dw_pcie_iatu_detect(pci);
> > > diff --git a/drivers/pci/controller/dwc/pcie-designware.h b/drivers/pci/controller/dwc/pcie-designware.h
> > > index 6821446d7c66..c3aeafd0f4c9 100644
> > > --- a/drivers/pci/controller/dwc/pcie-designware.h
> > > +++ b/drivers/pci/controller/dwc/pcie-designware.h
> > > @@ -332,7 +332,9 @@ struct dw_pcie_rp {
> > >  };
> > >
> > >  struct dw_pcie_ep_ops {
> > > +	void	(*ep_pre_init)(struct dw_pcie_ep *ep);
> > >  	void	(*ep_init)(struct dw_pcie_ep *ep);
> > > +	void	(*ep_deinit)(struct dw_pcie_ep *ep);
> > 
> > Since the struct name itself has "ep", there is no need to add the "ep" suffix
> > to callbacks. You should fix the existing ep_init callback too in a separate
> > patch.
> 

> I got it. I'll make such a separate patch before this patch.
> 
> Best regards,
> Yoshihiro Shimoda
> 
> > (this series is just GROWING!!!)

The series indeed gets to be too bulky. What about moving that cleanup
patch to a separate patchset which Yoshihiro promised to create
afterwards? Mani?

Anyway should you provide the init()/deinit() callbacks prefix
dropping patch it should fix the dw_pcie_host_ops fields too. It also
has a redundant prefix/suffix. Though it's up to Mani to decide
whether it should be really done.

-Serge(y)

> > 
> > - Mani
> > 
> > >  	int	(*raise_irq)(struct dw_pcie_ep *ep, u8 func_no,
> > >  			     enum pci_epc_irq_type type, u16 interrupt_num);
> > >  	const struct pci_epc_features* (*get_features)(struct dw_pcie_ep *ep);
> > > --
> > > 2.25.1
> > >
> > 
> > --
> > மணிவண்ணன் சதாசிவம்