Re: [PATCH v6 05/13] PCI: brcmstb: Use bridge reset if available

[Bjorn Helgaas <helgaas@kernel.org>]

On Tue, Sep 10, 2024 at 01:30:41PM -0400, Jim Quinlan wrote:
> On Tue, Sep 3, 2024 at 10:26 AM Jim Quinlan <james.quinlan@broadcom.com> wrote:
> > On Mon, Sep 2, 2024 at 3:18 PM Bjorn Helgaas <helgaas@kernel.org> wrote:
> > > On Thu, Aug 15, 2024 at 06:57:18PM -0400, Jim Quinlan wrote:
> > > > The 7712 SOC has a bridge reset which can be described in the device tree.
> > > > Use it if present.  Otherwise, continue to use the legacy method to reset
> > > > the bridge.
> > >
> > > >  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 (val)
> > > > +             reset_control_assert(pcie->bridge_reset);
> > > > +     else
> > > > +             reset_control_deassert(pcie->bridge_reset);
> > > >
> > > > -     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));
> > > > +     if (!pcie->bridge_reset) {
> > > > +             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));
> > > > +     }
> > >
> > > This pattern looks goofy:
> > >
> > >   reset_control_assert(pcie->bridge_reset);
> > >   if (!pcie->bridge_reset) {
> > >     ...
> > >
> > > If we're going to test pcie->bridge_reset at all, it should be first
> > > so it's obvious what's going on and the reader doesn't have to go
> > > verify that reset_control_assert() ignores and returns success for a
> > > NULL pointer:
> > >
> > >   if (pcie->bridge_reset) {
> > >     if (val)
> > >       reset_control_assert(pcie->bridge_reset);
> > >     else
> > >       reset_control_deassert(pcie->bridge_reset);
> > >
> > >     return;
> > >   }
> > >
> > >   u32 tmp, mask =  RGR1_SW_INIT_1_INIT_GENERIC_MASK;
> > >   ...
> > >
> > Will do.
> 
> Hi Bjorn,
> 
> It is not clear to me if you want a new series -- which would be V7 --
> or you are okay with the current series V6.  If the latter, someone
> sent in a fixup commit which must be included.
> Please advise.

Krzysztof amended this on the branch.  Take a look here and verify
that it makes sense to you:

  https://git.kernel.org/pub/scm/linux/kernel/git/pci/pci.git/tree/drivers/pci/controller/pcie-brcmstb.c?h=controller/brcmstb#n752

If that looks right to you, no need to post a new v7.

I think Krzysztof also integrated an "int num_inbound_wins" fix; is
that the one you mean?  If I'm thinking of the right one, you can
check that at:

  https://git.kernel.org/pub/scm/linux/kernel/git/pci/pci.git/tree/drivers/pci/controller/pcie-brcmstb.c?h=controller/brcmstb#n1034

> > > Krzysztof, can you amend this on the branch?
> > >
> > > It will also make the eventual return checking and error message
> > > simpler because we won't have to initialize "ret" first, and we can
> > > "return 0" directly for the legacy case.
> > >
> > > Bjorn