linux-kernel - Re: [PATCH v2 6/8] PCI: brcmstb: Use same constant table for config space access

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Message-ID: <CA+-6iNzOWU1qLfmSiThdYXX0v5RkbUYtf52yk6KXm6yDDNRUnw@mail.gmail.com>
Date: Tue, 4 Mar 2025 11:37:14 -0500
From: Jim Quinlan <james.quinlan@...adcom.com>
To: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
Cc: linux-pci@...r.kernel.org, Nicolas Saenz Julienne <nsaenz@...nel.org>, 
	Bjorn Helgaas <bhelgaas@...gle.com>, Lorenzo Pieralisi <lorenzo.pieralisi@....com>, 
	Cyril Brulebois <kibi@...ian.org>, Stanimir Varbanov <svarbanov@...e.de>, 
	bcm-kernel-feedback-list@...adcom.com, jim2101024@...il.com, 
	Florian Fainelli <florian.fainelli@...adcom.com>, Lorenzo Pieralisi <lpieralisi@...nel.org>, 
	Krzysztof Wilczyński <kw@...ux.com>, 
	Rob Herring <robh@...nel.org>, 
	"moderated list:BROADCOM BCM2711/BCM2835 ARM ARCHITECTURE" <linux-rpi-kernel@...ts.infradead.org>, 
	"moderated list:BROADCOM BCM2711/BCM2835 ARM ARCHITECTURE" <linux-arm-kernel@...ts.infradead.org>, 
	open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 6/8] PCI: brcmstb: Use same constant table for config
 space access

On Tue, Mar 4, 2025 at 10:08 AM Manivannan Sadhasivam
<manivannan.sadhasivam@...aro.org> wrote:
>
> On Fri, Feb 14, 2025 at 12:39:34PM -0500, Jim Quinlan wrote:
> > The constants EXT_CFG_DATA and EXT_CFG_INDEX vary by SOC. One of the
> > map_bus methods used these constants, the other used different constants.
> > Fortunately there was no problem because the SoCs that used the latter
> > map_bus method all had the same register constants.
> >
> > Remove the redundant constants and adjust the code to use them.  In
> > addition, update EXT_CFG_DATA to use the 4k-page based config space access
> > system, which is what the second map_bus method was already using.
> >
>
> What is the effect of this change? Why is it required? Sounds like it got
> sneaked in.

Hello,
There is no functional difference with this commit -- the code will
behave the same.  A previous commit set up the "EXT_CFG_DATA" and
"EXT_CFG_INDEX" constants in the offset table but one of the map_bus()
methods did not use them, instead it relied on old generic #define
constants.  This commit uses them and gets rid of the old #defines.

I didn't add a "Fixes" line because there is no functional change but
I can if you want.

Regards,
Jim Quinlan
Broadcom STB/CM

>
> > Signed-off-by: Jim Quinlan <james.quinlan@...adcom.com>
> > ---
> >  drivers/pci/controller/pcie-brcmstb.c | 14 ++++++--------
> >  1 file changed, 6 insertions(+), 8 deletions(-)
> >
> > diff --git a/drivers/pci/controller/pcie-brcmstb.c b/drivers/pci/controller/pcie-brcmstb.c
> > index e1059e3365bd..923ac1a03f85 100644
> > --- a/drivers/pci/controller/pcie-brcmstb.c
> > +++ b/drivers/pci/controller/pcie-brcmstb.c
> > @@ -150,9 +150,6 @@
> >  #define  MSI_INT_MASK_SET            0x10
> >  #define  MSI_INT_MASK_CLR            0x14
> >
> > -#define PCIE_EXT_CFG_DATA                            0x8000
> > -#define PCIE_EXT_CFG_INDEX                           0x9000
> > -
> >  #define  PCIE_RGR1_SW_INIT_1_PERST_MASK                      0x1
> >  #define  PCIE_RGR1_SW_INIT_1_PERST_SHIFT             0x0
> >
> > @@ -727,8 +724,8 @@ static void __iomem *brcm_pcie_map_bus(struct pci_bus *bus,
> >
> >       /* For devices, write to the config space index register */
> >       idx = PCIE_ECAM_OFFSET(bus->number, devfn, 0);
> > -     writel(idx, pcie->base + PCIE_EXT_CFG_INDEX);
> > -     return base + PCIE_EXT_CFG_DATA + PCIE_ECAM_REG(where);
> > +     writel(idx, base + IDX_ADDR(pcie));
> > +     return base + DATA_ADDR(pcie) + PCIE_ECAM_REG(where);
> >  }
> >
> >  static void __iomem *brcm7425_pcie_map_bus(struct pci_bus *bus,
> > @@ -1711,7 +1708,7 @@ static void brcm_pcie_remove(struct platform_device *pdev)
> >  static const int pcie_offsets[] = {
> >       [RGR1_SW_INIT_1]        = 0x9210,
> >       [EXT_CFG_INDEX]         = 0x9000,
> > -     [EXT_CFG_DATA]          = 0x9004,
> > +     [EXT_CFG_DATA]          = 0x8000,
> >       [PCIE_HARD_DEBUG]       = 0x4204,
> >       [PCIE_INTR2_CPU_BASE]   = 0x4300,
> >  };
> > @@ -1719,7 +1716,7 @@ static const int pcie_offsets[] = {
> >  static const int pcie_offsets_bcm7278[] = {
> >       [RGR1_SW_INIT_1]        = 0xc010,
> >       [EXT_CFG_INDEX]         = 0x9000,
> > -     [EXT_CFG_DATA]          = 0x9004,
> > +     [EXT_CFG_DATA]          = 0x8000,
> >       [PCIE_HARD_DEBUG]       = 0x4204,
> >       [PCIE_INTR2_CPU_BASE]   = 0x4300,
> >  };
> > @@ -1733,8 +1730,9 @@ static const int pcie_offsets_bcm7425[] = {
> >  };
> >
> >  static const int pcie_offsets_bcm7712[] = {
> > +     [RGR1_SW_INIT_1]        = 0x9210,
> >       [EXT_CFG_INDEX]         = 0x9000,
> > -     [EXT_CFG_DATA]          = 0x9004,
> > +     [EXT_CFG_DATA]          = 0x8000,
> >       [PCIE_HARD_DEBUG]       = 0x4304,
> >       [PCIE_INTR2_CPU_BASE]   = 0x4400,
> >  };
> > --
> > 2.43.0
> >
>
> --
> மணிவண்ணன் சதாசிவம்

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