linux-kernel - RE: [PATCH V1] ARM: dts: tegra: Modify pcie memory space size

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Message-ID: <C79B248886DD134989C8FF6B096A91AB91CF1615EC@BGMAIL01.nvidia.com>
Date:	Fri, 21 Jun 2013 11:00:20 +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>,
	"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 V1] ARM: dts: tegra: Modify pcie memory space size

> On 06/20/2013 01:14 AM, Jay Agarwal wrote:
> > - decrease non-prefetch memory size to 128 MB
> > - increase prefetch memory size to 384 MB
> > - above change is done because most pcie devices
> >   prefetch memory size requirement is quite higher
> >   compared to non-prefetch memory space.
> 
> It's possible this change won't be suitable for all applications. People may
> simply need to adjust their DT based on what they want to connect.
> Still, this patch probably biases things in the correct way for now.
> Longer term, we might want to investigate dynamically sizing the windows
> in order to support arbitrary attached devices, in much the same way as the
> Marvell code does/will in order to conserve physical/bus address space for
> their multiple controllers.
> 
> However, this change allows me to correctly enumerate a particular GPU I
> have plugged into my Harmony board, and assign all the BARs, so:
> 
> Tested-by: Stephen Warren <swarren@...dia.com>
> 
Thierry,
Could you please integrate this change also to your branch if review is done. Please let me know once it is done.
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