linux-kernel - Re: [PATCH v11 2/9] ARM: l2c: use l2c_write_sec() for restoring latency and filter regs

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Message-ID: <20150105162214.GB4081@atomide.com>
Date:	Mon, 5 Jan 2015 08:22:14 -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 2/9] ARM: l2c: use l2c_write_sec() for restoring
 latency and filter regs

* Marek Szyprowski <m.szyprowski@...sung.com> [150105 04:22]:
> All four register for latency and filter settings cannot be written in
> non-secure mode and they should go through l2c_write_sec(). More on this
> can be found in CoreLink Level 2 Cache Controller L2C-310 Technical
> Reference Manual, 3.2. Register summary, table 3.1. This have been checked
> the TRM for r3p3, but it should be uniform for all revisions.
> 
> Reported-by: Nishanth Menon <nm@...com>
> Suggested-by: Tomasz Figa <tomasz.figa@...il.com>
> Signed-off-by: Marek Szyprowski <m.szyprowski@...sung.com>

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

> ---
>  arch/arm/mm/cache-l2x0.c | 16 ++++++++--------
>  1 file changed, 8 insertions(+), 8 deletions(-)
> 
> diff --git a/arch/arm/mm/cache-l2x0.c b/arch/arm/mm/cache-l2x0.c
> index 5e65ca8dea62..0aeeaa95c42d 100644
> --- a/arch/arm/mm/cache-l2x0.c
> +++ b/arch/arm/mm/cache-l2x0.c
> @@ -623,14 +623,14 @@ static void l2c310_resume(void)
>  		unsigned revision;
>  
>  		/* restore pl310 setup */
> -		writel_relaxed(l2x0_saved_regs.tag_latency,
> -			       base + L310_TAG_LATENCY_CTRL);
> -		writel_relaxed(l2x0_saved_regs.data_latency,
> -			       base + L310_DATA_LATENCY_CTRL);
> -		writel_relaxed(l2x0_saved_regs.filter_end,
> -			       base + L310_ADDR_FILTER_END);
> -		writel_relaxed(l2x0_saved_regs.filter_start,
> -			       base + L310_ADDR_FILTER_START);
> +		l2c_write_sec(l2x0_saved_regs.tag_latency, base,
> +			      L310_TAG_LATENCY_CTRL);
> +		l2c_write_sec(l2x0_saved_regs.data_latency, base,
> +			      L310_DATA_LATENCY_CTRL);
> +		l2c_write_sec(l2x0_saved_regs.filter_end, base,
> +			      L310_ADDR_FILTER_END);
> +		l2c_write_sec(l2x0_saved_regs.filter_start, base,
> +			      L310_ADDR_FILTER_START);
>  
>  		revision = readl_relaxed(base + L2X0_CACHE_ID) &
>  				L2X0_CACHE_ID_RTL_MASK;
> -- 
> 1.9.2
> 
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