linux-kernel - Re: [PATCH v6 4/7] ARM: l2c: Add support for overriding prefetch settings

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Message-ID: <20141027111404.GW12379@n2100.arm.linux.org.uk>
Date:	Mon, 27 Oct 2014 11:14:04 +0000
From:	Russell King - ARM Linux <linux@....linux.org.uk>
To:	Marek Szyprowski <m.szyprowski@...sung.com>
Cc:	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-samsung-soc@...r.kernel.org,
	Tomasz Figa <tomasz.figa@...il.com>,
	Kyungmin Park <kyungmin.park@...sung.com>,
	Kukjin Kim <kgene.kim@...sung.com>, lauraa@...eaurora.org,
	linux-omap@...r.kernel.org, linus.walleij@...aro.org,
	santosh.shilimkar@...com, tony@...mide.com, drake@...lessm.com,
	loeliger@...il.com, Mark Rutland <mark.rutland@....com>
Subject: Re: [PATCH v6 4/7] ARM: l2c: Add support for overriding prefetch
	settings

On Mon, Oct 27, 2014 at 12:05:47PM +0100, Marek Szyprowski wrote:
> From: Tomasz Figa <t.figa@...sung.com>
> 
> Firmware on certain boards (e.g. ODROID-U3) can leave incorrect L2C prefetch
> settings configured in registers leading to crashes if L2C is enabled
> without overriding them. This patch introduces bindings to enable
> prefetch settings to be specified from DT and necessary support in the
> driver.
> 
> Signed-off-by: Tomasz Figa <t.figa@...sung.com>
> [mszyprow: rebased onto v3.18-rc1, added error messages when property value
>  is missing]

Why?  What if the boot loader has already set these up appropriately?  Why
should we force people to list these in the DT?

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