linux-kernel - Re: [PATCH V3 2/4] ARM: tegra: pcie: Add tegra3 support

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Message-ID: <20130611101610.GB932@manwe>
Date:	Tue, 11 Jun 2013 12:16:11 +0200
From:	Thierry Reding <thierry.reding@...il.com>
To:	Jay Agarwal <jagarwal@...dia.com>
Cc:	Stephen Warren <swarren@...dotorg.org>,
	"linux@....linux.org.uk" <linux@....linux.org.uk>,
	"bhelgaas@...gle.com" <bhelgaas@...gle.com>,
	Laxman Dewangan <ldewangan@...dia.com>,
	"olof@...om.net" <olof@...om.net>, Hiroshi Doyu <hdoyu@...dia.com>,
	Prashant Gaikwad <pgaikwad@...dia.com>,
	"mturquette@...aro.org" <mturquette@...aro.org>,
	Peter De Schrijver <pdeschrijver@...dia.com>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-tegra@...r.kernel.org" <linux-tegra@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
	Juha Tukkinen <jtukkinen@...dia.com>,
	Krishna Thota <kthota@...dia.com>
Subject: Re: [PATCH V3 2/4] ARM: tegra: pcie: Add tegra3 support

On Tue, Jun 11, 2013 at 10:13:38AM +0530, Jay Agarwal wrote:
> > * PGP Signed by an unknown key
> > 
> > On Tue, Jun 04, 2013 at 01:17:15PM -0600, Stephen Warren wrote:
> > > On 06/04/2013 12:57 PM, Jay Agarwal wrote:
> > [...]
> > > >  struct tegra_pcie_port {
> > > > @@ -384,7 +408,7 @@ static int tegra_pcie_read_conf(struct pci_bus
> > *bus, unsigned int devfn,
> > > >  		struct tegra_pcie_port *port;
> > > >
> > > >  		list_for_each_entry(port, &pcie->ports, list) {
> > > > -			if (port->index + 1 == slot) {
> > > > +			if (port->index == slot) {
> > >
> > > This and the equivalent change in tegra_pcie_write_conf() seem like a
> > > bug-fix unrelated to the addition of Tegra30 support. Hence, they
> > > should be a separate patch.
> > 
> > What exactly is this change supposed to fix? The description doesn't provide
> > any details about why this is required. Furthermore this was done on
> > purpose to model the Tegra PCIe controller according to what typical Linux
> > systems provide.
> 
> I have mentioned it in description as -> "Corrected logic in read/write config space to display right device number on bus 0"
> 
> > Device 0:00.0 is usually the root complex, and device 0:01.0, 0:02.0 etc are
> > the root ports. The change proposed above makes 0:00.0 the first root port,
> > therefore breaking what systems usually expect.
> > 
> I was seeing root port 2 in cardhu being enumerated as pci_bus 0000:03, which I thought should be pci_bus 0000:02, so made this change.

Yes, that's done on purpose to mirror what a typical PCI tree looks
like, as I already explained. So unless this fixes a real bug I'll just
drop it while applying.

Thierry

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