linux-kernel - RE: [PATCH 4/4] ARM: tegra: pcie: Enable PCIe controller on Cardhu

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Message-ID: <C79B248886DD134989C8FF6B096A91AB91B4886B5D@BGMAIL01.nvidia.com>
Date:	Wed, 15 May 2013 22:58:22 +0530
From:	Jay Agarwal <jagarwal@...dia.com>
To:	'Stephen Warren' <swarren@...dotorg.org>
CC:	"linux@....linux.org.uk" <linux@....linux.org.uk>,
	"thierry.reding@...onic-design.de" <thierry.reding@...onic-design.de>,
	Laxman Dewangan <ldewangan@...dia.com>,
	"bhelgaas@...gle.com" <bhelgaas@...gle.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 4/4] ARM: tegra: pcie: Enable PCIe controller on Cardhu


> On 05/08/2013 04:57 AM, Jay Agarwal wrote:
> > - Enable PCIe controller on Cardhu
> > - Only port 2 is connected on this board
> > - Add regulators required for Tegra30
> > - Patch is based on remotes/gitorious_thierryreding_linux/tegra/next
> > - and should be applied on top of this.
> 
> > diff --git a/arch/arm/boot/dts/tegra30-cardhu.dtsi
> > b/arch/arm/boot/dts/tegra30-cardhu.dtsi
> 
> > +	pcie-controller {
> > +		status = "okay";
> > +		pex-clk-supply = <&pex_hvdd_3v3_reg>;
> > +		vdd-supply = <&ldo1_reg>;
> > +		avdd-supply = <&ldo2_reg>;
> > +
> > +		pci@3,0 {
> > +			status = "okay";
> > +		};
> > +	};
> 
> So, if I apply this series, I do see the PCIe bridge and Ethernet device get
> enumerated, but I don't see the USB3 controller get enumerated. I believe
> that is a PCIe device behind the same bridge on the same Tegra PCIe port.
> Shouldn't this device show up?
[>]  I have also reproduced this problem. I see somehow no non-prefetchable memory is assigned to any of pcie devices.
Probably that is the reason for USB3 (pci 0000:04:00.0) not getting enumerated since it uses only non-prefetchable memory.
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