linux-kernel - Re: [PATCH v11 3/9] ARM: l2c: Refactor the driver to use commit-like interface

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Date:	Mon, 5 Jan 2015 08:23:34 -0800
From:	Tony Lindgren <tony@...mide.com>
To:	Marek Szyprowski <m.szyprowski@...sung.com>
Cc:	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	Tomasz Figa <tomasz.figa@...il.com>,
	Kyungmin Park <kyungmin.park@...sung.com>,
	linux-samsung-soc@...r.kernel.org, linux-omap@...r.kernel.org,
	Arnd Bergmann <arnd@...db.de>, Olof Johansson <olof@...om.net>,
	Russell King - ARM Linux <linux@....linux.org.uk>,
	Kukjin Kim <kgene.kim@...sung.com>, lauraa@...eaurora.org,
	linus.walleij@...aro.org, drake@...lessm.com, loeliger@...il.com,
	Mark Rutland <mark.rutland@....com>, nm@...com,
	khilman@...aro.org
Subject: Re: [PATCH v11 3/9] ARM: l2c: Refactor the driver to use commit-like
 interface

* Marek Szyprowski <m.szyprowski@...sung.com> [150105 04:22]:
> From: Tomasz Figa <t.figa@...sung.com>
> 
> Certain implementations of secure hypervisors (namely the one found on
> Samsung Exynos-based boards) do not provide access to individual L2C
> registers. This makes the .write_sec()-based interface insufficient and
> provoking ugly hacks.
> 
> This patch is first step to make the driver not rely on availability of
> writes to individual registers. This is achieved by refactoring the
> driver to use a commit-like operation scheme: all register values are
> prepared first and stored in an instance of l2x0_regs struct and then a
> single callback is responsible to flush those values to the hardware.
> 
> Signed-off-by: Tomasz Figa <t.figa@...sung.com>
> [mszyprow: rebased onto 'ARM: l2c: use l2c_write_sec() for restoring
>  latency and filter regs' patch]
> Signed-off-by: Marek Szyprowski <m.szyprowski@...sung.com>

This version seems to boot just fine on am437x here:

Acked-by: Tony Lindgren <tony@...mide.com>
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