From mboxrd@z Thu Jan  1 00:00:00 1970
From: jgunthorpe@obsidianresearch.com (Jason Gunthorpe)
Date: Wed, 6 Aug 2014 11:30:14 -0600
Subject: [PATCH] PCI: keystone: add a pci quirk to limit mrrs
In-Reply-To: <53E26155.1020107@ti.com>
References: <1407338300-9146-1-git-send-email-m-karicheri2@ti.com>
 <20140806163021.GB19914@obsidianresearch.com>
 <53E25E24.8070506@ti.com>
 <20140806165837.GC19914@obsidianresearch.com>
 <53E26155.1020107@ti.com>
Message-ID: <20140806173014.GD19914@obsidianresearch.com>
To: linux-arm-kernel@lists.infradead.org
List-Id: linux-arm-kernel.lists.infradead.org

On Wed, Aug 06, 2014 at 01:09:41PM -0400, Murali Karicheri wrote:

> >>Yes it works with tuning enabled. Tuning happens afterwards. The
> >>'limiting mrrs to 256' below is from my patch.
> >
> >That seems backwards to me...
> Rational? The tuning is reading mrrs and set mps to less than or
> equal to mrss. So adding this before make sure mrrs used is below
> keystones's limit.

The tuning process adjusts the parameters however it sees fit, todays
algorithm might not increase a BIOS set MRRS, but tomorrow's could.

The quirk should be after the tuning to ensure the MRRS is limited..

Jason