linux-kernel - Re: [PATCH v1 7/7] i2c: i801: convert to use common P2SB accessor

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Date:   Tue, 21 Dec 2021 17:08:29 +0200
From:   Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:     Jean Delvare <jdelvare@...e.de>
Cc:     Wolfram Sang <wsa+renesas@...g-engineering.com>,
        Lee Jones <lee.jones@...aro.org>,
        Tan Jui Nee <jui.nee.tan@...el.com>,
        Jim Quinlan <james.quinlan@...adcom.com>,
        Jonathan Yong <jonathan.yong@...el.com>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        linux-kernel@...r.kernel.org, linux-i2c@...r.kernel.org,
        linux-pci@...r.kernel.org, Peter Tyser <ptyser@...-inc.com>,
        hdegoede@...hat.com, henning.schild@...mens.com
Subject: Re: [PATCH v1 7/7] i2c: i801: convert to use common P2SB accessor

On Wed, Mar 10, 2021 at 03:51:45PM +0100, Jean Delvare wrote:
> On Mon,  8 Mar 2021 14:20:20 +0200, Andy Shevchenko wrote:

...

> > -	res->end = res->start + 3;
> > -	res->flags = IORESOURCE_MEM;
> > +		res->start += SBREG_SMBCTRL;
> 
> I can't see why you no longer set res->end and res->flags here. I can
> imagine that pci_p2sb_bar() may have set the flags for us, but not that
> ->end is still correct after you fixed up ->start. Am I missing
> something?

Good catch of the res->end! But flags actually may be MEM64, which the
original code doesn't properly handle.

...

> >  static const struct x86_cpu_id p2sb_cpu_ids[] = {
> >  	X86_MATCH_INTEL_FAM6_MODEL(ATOM_GOLDMONT,	PCI_DEVFN(13, 0)),
> > +	X86_MATCH_INTEL_FAM6_MODEL(ATOM_GOLDMONT_D,	PCI_DEVFN(31, 1)),
> > +	X86_MATCH_INTEL_FAM6_MODEL(ATOM_SILVERMONT_D,	PCI_DEVFN(31, 1)),
> > +	X86_MATCH_INTEL_FAM6_MODEL(KABYLAKE,		PCI_DEVFN(31, 1)),
> > +	X86_MATCH_INTEL_FAM6_MODEL(KABYLAKE_L,		PCI_DEVFN(31, 1)),
> > +	X86_MATCH_INTEL_FAM6_MODEL(SKYLAKE,		PCI_DEVFN(31, 1)),
> > +	X86_MATCH_INTEL_FAM6_MODEL(SKYLAKE_L,		PCI_DEVFN(31, 1)),
> >  	{}
> >  };
> 
> Any reason why this is added in this patch instead of [3/7] (PCI: New
> Primary to Sideband (P2SB) bridge support library)?

Filling this on demand, no user no entry. I think it's how we assume the code
to be applied in the kernel.

-- 
With Best Regards,
Andy Shevchenko