[PATCH] ARM: OMAP2+: l2c: squelch warning dump on power control setting

From: balbi@ti.com (Felipe Balbi)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH] ARM: OMAP2+: l2c: squelch warning dump on power control setting
Date: Wed, 9 Jul 2014 08:55:30 -0500	[thread overview]
Message-ID: <20140709135530.GD973@saruman.home> (raw)
In-Reply-To: <53BD34FD.5070005@ti.com>

On Wed, Jul 09, 2014 at 05:56:37PM +0530, Sekhar Nori wrote:
> On Wednesday 09 July 2014 02:55 PM, Tony Lindgren wrote:
> > * Tony Lindgren <tony@atomide.com> [140708 01:32]:
> >> * Sekhar Nori <nsekhar@ti.com> [140707 21:56]:
> >>> On Monday 07 July 2014 08:40 PM, Felipe Balbi wrote:
> >>>> On Mon, Jul 07, 2014 at 02:40:08PM +0100, Russell King - ARM Linux wrote:
> >>>>> --- a/arch/arm/mm/cache-l2x0.c
> >>>>> +++ b/arch/arm/mm/cache-l2x0.c
> >>>>> @@ -732,7 +732,7 @@ static int l2c310_cpu_enable_flz(struct notifier_block *nb, unsigned long act, v
> >>>>>  
> >>>>>  static void __init l2c310_enable(void __iomem *base, u32 aux, unsigned num_lock)
> >>>>>  {
> >>>>> -	unsigned rev = readl_relaxed(base + L2X0_CACHE_ID) & L2X0_CACHE_ID_PART_MASK;
> >>>>> +	unsigned rev = readl_relaxed(base + L2X0_CACHE_ID) & L2X0_CACHE_ID_RTL_MASK;
> >>>>>  	bool cortex_a9 = read_cpuid_part() == ARM_CPU_PART_CORTEX_A9;
> >>>>
> >>>> even with this change, l2c still tries to write to power control
> >>>> register, at least on AM437x. Looking a little deeper here, AM437x
> >>>> identifies itself as l2c PL310 r3p3, which should have power control
> >>>> register, but aparentely there's no way to write that register. I'll
> >>>> file a bug to our ROM team, but we will certainly need a way to
> >>>> workaround this inside omap4-common.c
> >>>
> >>> Looks like we need both my patch as well as Russell's patch. I can
> >>> respin my patch with the pr_info_once() dropped if it helps further
> >>> reduce boot noise.
> >>
> >> In that case I'm fine with the original patch in this series. Russell,
> >> got any better ideas?
> > 
> > I guess no more comments. Took a look at the patch again, Sekhar, can
> > you please update the description with what has been discovered in this
> > thread and repost?
> 
> How does the following sound:
> 
> ---
> AM437x has L2C-310 version r3p2 and ROM code on that device does not

at least my SoC has r3p3 (cache ID 0x9), other than that, commit log
looks good to my eyes.

-- 
balbi
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