RE: [PATCH 3/7] PCI: renesas: Add R-Car Gen4 PCIe Host support

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Hi Bjorn,

Thank you for your review!

> From: Bjorn Helgaas, Sent: Tuesday, June 14, 2022 5:34 AM
> 
> On Mon, Jun 13, 2022 at 08:57:08PM +0900, Yoshihiro Shimoda wrote:
> > Add R-Car Gen4 PCIe Host support. This controller is based on
> > Synopsys Designware PCIe.
> 
> You used "DesignWare" below, which I think is what Synopsys uses.

Yes. So, I'll rename "Designware" with "DesignWare" in this description.

> > Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@xxxxxxxxxxx>
> > ---
> >  drivers/pci/controller/dwc/Kconfig            |   9 +
> >  drivers/pci/controller/dwc/Makefile           |   1 +
> >  .../pci/controller/dwc/pcie-rcar-gen4-host.c  | 235 ++++++++++++++++++
> >  drivers/pci/controller/dwc/pcie-rcar-gen4.c   | 198 +++++++++++++++
> >  drivers/pci/controller/dwc/pcie-rcar-gen4.h   |  59 +++++
> >  5 files changed, 502 insertions(+)
> >  create mode 100644 drivers/pci/controller/dwc/pcie-rcar-gen4-host.c
> >  create mode 100644 drivers/pci/controller/dwc/pcie-rcar-gen4.c
> >  create mode 100644 drivers/pci/controller/dwc/pcie-rcar-gen4.h
> >
> > diff --git a/drivers/pci/controller/dwc/Kconfig b/drivers/pci/controller/dwc/Kconfig
> > index 62ce3abf0f19..3ddccc9c38c5 100644
> > --- a/drivers/pci/controller/dwc/Kconfig
> > +++ b/drivers/pci/controller/dwc/Kconfig
> > @@ -384,4 +384,13 @@ config PCIE_FU740
> >  	  Say Y here if you want PCIe controller support for the SiFive
> >  	  FU740.
> >
> > +config PCIE_RCAR_GEN4
> > +	bool "Renesas R-Car Gen4 PCIe Host controller"
> > +	depends on ARCH_RENESAS || COMPILE_TEST
> > +	depends on PCI_MSI_IRQ_DOMAIN
> > +	select PCIE_DW_HOST
> > +	help
> > +	  Say Y here if you want PCIe host controller support on R-Car Gen4 SoCs.
> > +	  This uses the DesignWare core.
> 
> > +++ b/drivers/pci/controller/dwc/pcie-rcar-gen4-host.c
> > @@ -0,0 +1,235 @@
> > +// SPDX-License-Identifier: GPL-2.0
> > +/*
> > + * PCIe host controller driver for Renesas R-Car Gen4 Series SoCs
> > + * Copyright (C) 2022 Renesas Electronics Corporation
> > + */
> > +
> > +#include <linux/interrupt.h>
> > +#include <linux/module.h>
> > +#include <linux/of_device.h>
> > +#include <linux/pci.h>
> > +#include <linux/platform_device.h>
> > +
> > +#include "pcie-rcar-gen4.h"
> > +#include "pcie-designware.h"
> > +
> > +/* ASPM L1 PM Substates */
> > +#define L1PSCAP(x)		(0x01bc + (x))
> 
> Looks like the stuff in pcie-rcar-gen4.h.  Should this go there?

Yes. I'll move it.

> > +	/* Set Max Link Width */
> 
> Superfluous comment, since the function name says the same thing.

I got it. I'll drop it.

> > +	rcar_gen4_pcie_set_max_link_width(pci, pci->num_lanes);
> 
> > +/* Link Capabilities - Maximum Link Width */
> > +#define  PCI_EXP_LNKCAP_MLW_X1	BIT(4)
> > +#define  PCI_EXP_LNKCAP_MLW_X2	BIT(5)
> > +#define  PCI_EXP_LNKCAP_MLW_X4	BIT(6)
> 
> I think we should define these in include/uapi/linux/pci_regs.h.
> Use the same style as the other #defines there, i.e.,
> 
>   #define  PCI_EXP_LNKCAP_MLW_X1  0x00000010
>   #define  PCI_EXP_LNKCAP_MLW_X2  0x00000020
>   #define  PCI_EXP_LNKCAP_MLW_X4  0x00000040

I got it. I'll add macros from x1 to x32.

> > +/* Renesas-specific */
> > +#define PCIEMSR0		0x0000
> > +#define  BIFUR_MOD_SET_ON	(0x1 << 0)
> > +#define  DEVICE_TYPE_EP		(0x0 << 2)
> > +#define  DEVICE_TYPE_RC		(0x4 << 2)
> > +
> > +#define PCIEINTSTS0		0x0084
> > +#define PCIEINTSTS0EN		0x0310
> > +#define  MSI_CTRL_INT		BIT(26)
> > +#define  SMLH_LINK_UP		BIT(7)
> > +#define  RDLH_LINK_UP		BIT(6)
> 
> Is there a reason to mix the "(0x1 << 0)" style and the "BIT(26)"
> styles?

No, this should be fixed. I'll use "BIT()" instead.

> > +extern u32 rcar_gen4_pcie_readl(struct rcar_gen4_pcie *pcie, u32 reg);
> > +extern void rcar_gen4_pcie_writel(struct rcar_gen4_pcie *pcie, u32 reg, u32 val);
> > +extern void rcar_gen4_pcie_set_max_link_width(struct dw_pcie *pci, int num_lanes);
> > +extern int rcar_gen4_pcie_prepare(struct rcar_gen4_pcie *pcie);
> > +extern void rcar_gen4_pcie_unprepare(struct rcar_gen4_pcie *pcie);
> > +extern int rcar_gen4_pcie_pm_runtime_enable(struct device *dev);
> > +extern void rcar_gen4_pcie_pm_runtime_disable(struct device *dev);
> > +extern int rcar_gen4_pcie_devm_clk_and_reset_get(struct rcar_gen4_pcie *pcie,
> > +						 struct device *dev);
> > +extern struct rcar_gen4_pcie *rcar_gen4_pcie_devm_alloc(struct device *dev);
> 
> Don't bother with "extern" on function declarations; this would be the
> only instance in drivers/pci/.

I got it. I'll drop "extern".

Best regards,
Yoshihiro Shimoda






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