linux-kernel - Re: [PATCH v3 04/12] PCI: brcmstb: Use bridge reset if available

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Message-ID: <CA+-6iNxm0mVDKWAH1P8ZYs5cVf7YEKSeM-r38Re8ST2v8+BKXQ@mail.gmail.com>
Date: Tue, 16 Jul 2024 14:40:13 -0400
From: Jim Quinlan <james.quinlan@...adcom.com>
To: Amit Singh Tomar <amitsinght@...vell.com>
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>, 
	Krzysztof Kozlowski <krzk@...nel.org>, 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>, Philipp Zabel <p.zabel@...gutronix.de>, 
	"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 v3 04/12] PCI: brcmstb: Use bridge reset if available

On Sat, Jul 13, 2024 at 3:12 PM Amit Singh Tomar <amitsinght@...vell.com> wrote:
>
> On 7/11/2024 3:46 AM, Jim Quinlan wrote:
> > The 7712 SOC has a bridge reset which can be described in the device tree.
> > If it is present, use it. Otherwise, continue to use the legacy method to
> > reset the bridge.
> >
> > Signed-off-by: Jim Quinlan <james.quinlan@...adcom.com>
> > ---
> >   drivers/pci/controller/pcie-brcmstb.c | 22 +++++++++++++++++-----
> >   1 file changed, 17 insertions(+), 5 deletions(-)
> >
> > diff --git a/drivers/pci/controller/pcie-brcmstb.c b/drivers/pci/controller/pcie-brcmstb.c
> > index c257434edc08..92816d8d215a 100644
> > --- a/drivers/pci/controller/pcie-brcmstb.c
> > +++ b/drivers/pci/controller/pcie-brcmstb.c
> > @@ -265,6 +265,7 @@ struct brcm_pcie {
> >       enum pcie_type          type;
> >       struct reset_control    *rescal;
> >       struct reset_control    *perst_reset;
> > +     struct reset_control    *bridge;
> >       int                     num_memc;
> >       u64                     memc_size[PCIE_BRCM_MAX_MEMC];
> >       u32                     hw_rev;
> > @@ -732,12 +733,19 @@ static void __iomem *brcm7425_pcie_map_bus(struct pci_bus *bus,
> >
> >   static void brcm_pcie_bridge_sw_init_set_generic(struct brcm_pcie *pcie, u32 val)
> >   {
> > -     u32 tmp, mask =  RGR1_SW_INIT_1_INIT_GENERIC_MASK;
> > -     u32 shift = RGR1_SW_INIT_1_INIT_GENERIC_SHIFT;
> > +     if (pcie->bridge) {
> > +             if (val)
> > +                     reset_control_assert(pcie->bridge);
> > +             else
> > +                     reset_control_deassert(pcie->bridge);
> > +     } else {
> > +             u32 tmp, mask =  RGR1_SW_INIT_1_INIT_GENERIC_MASK;
> > +             u32 shift = RGR1_SW_INIT_1_INIT_GENERIC_SHIFT;
> >
> > -     tmp = readl(pcie->base + PCIE_RGR1_SW_INIT_1(pcie));
> > -     tmp = (tmp & ~mask) | ((val << shift) & mask);
> > -     writel(tmp, pcie->base + PCIE_RGR1_SW_INIT_1(pcie));
> > +             tmp = readl(pcie->base + PCIE_RGR1_SW_INIT_1(pcie));
> > +             tmp = (tmp & ~mask) | ((val << shift) & mask);
> > +             writel(tmp, pcie->base + PCIE_RGR1_SW_INIT_1(pcie));
> > +     }
> >   }
> >
> >   static void brcm_pcie_bridge_sw_init_set_7278(struct brcm_pcie *pcie, u32 val)
> > @@ -1621,6 +1629,10 @@ static int brcm_pcie_probe(struct platform_device *pdev)
> >       if (IS_ERR(pcie->perst_reset))
> >               return PTR_ERR(pcie->perst_reset);
> >
> > +     pcie->bridge = devm_reset_control_get_optional_exclusive(&pdev->dev, "bridge");
> > +     if (IS_ERR(pcie->bridge))
> > +             return PTR_ERR(pcie->bridge);
> How about using "dev_err_probe," which utilizes "dev_err" for logging
> error messages and recording the deferred probe reason?

Hello Amit,

Someone else brought this up and I want to defer moving to
dev_err_probe() in a future series.  I'd like to get this series out
now as Stan is waiting to apply his commits on top of it.

Regards,
Jim Quinlan
Broadcom STB/CM
> > +
> >       ret = clk_prepare_enable(pcie->clk);
> >       if (ret) {
> >               dev_err(&pdev->dev, "could not enable clock\n");
>

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