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From: Russell King - ARM Linux <linux@arm.linux.org.uk>
To: Arnd Bergmann <arnd@arndb.de>
Cc: linux-arm-kernel@lists.infradead.org,
	Hante Meuleman <meuleman@broadcom.com>,
	linux-wireless <linux-wireless@vger.kernel.org>,
	brcm80211-dev-list <brcm80211-dev-list@broadcom.com>,
	Will Deacon <will.deacon@arm.com>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	Arend Van Spriel <arend@broadcom.com>,
	David Miller <davem@davemloft.net>,
	Marek Szyprowski <m.szyprowski@samsung.com>,
	hauke@hauke-m.de
Subject: Re: using DMA-API on ARM
Date: Mon, 8 Dec 2014 15:17:33 +0000	[thread overview]
Message-ID: <20141208151733.GF11285@n2100.arm.linux.org.uk> (raw)
In-Reply-To: <2863746.4sUSEYqahB@wuerfel>

On Mon, Dec 08, 2014 at 04:01:32PM +0100, Arnd Bergmann wrote:
> In your log, I see this message:
> 
> [    0.000000] PL310 OF: cache setting yield illegal associativity
> [    0.000000] PL310 OF: -1069781724 calculated, only 8 and 16 legal
> [    0.000000] L2C-310 enabling early BRESP for Cortex-A9
> [    0.000000] L2C-310 full line of zeros enabled for Cortex-A9
> [    0.000000] L2C-310 dynamic clock gating enabled, standby mode enabled
> [    0.000000] L2C-310 cache controller enabled, 16 ways, 256 kB
> [    0.000000] L2C-310: CACHE_ID 0x410000c8, AUX_CTRL 0x4e130001
> 
> Evidently the cache controller information in DT is incorrect and
> the setup may be wrong as a consequence, which may explain cache
> coherency problems.

No.  See d0b92845e54 (ARM: 8182/1: l2c: Make l2x0_cache_size_of_parse() return 'int')
which was merged in rc3, post-dating this kernel.  The original commit
was buggy, and produces those harmless "illegal associativity" messages.
They occur if DT *doesn't* specify the cache parameters, in which case
we use the hardware-set value (which /should/ be correct.)

We made these optional in DT as hardware really should set these
correctly in the first place.

-- 
FTTC broadband for 0.8mile line: currently at 9.5Mbps down 400kbps up
according to speedtest.net.

  reply	other threads:[~2014-12-08 15:17 UTC|newest]

Thread overview: 41+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2014-12-05  9:22 using DMA-API on ARM Arend van Spriel
2014-12-05  9:45 ` Russell King - ARM Linux
2014-12-05 12:24   ` Will Deacon
2014-12-05 12:56     ` Hante Meuleman
2014-12-05 13:23       ` Russell King - ARM Linux
2014-12-05 14:20         ` Hante Meuleman
2014-12-05 14:47           ` Arend van Spriel
2014-12-08 13:47           ` Hante Meuleman
2014-12-08 15:01             ` Arnd Bergmann
2014-12-08 15:17               ` Russell King - ARM Linux [this message]
2014-12-08 15:22                 ` Arnd Bergmann
2014-12-08 16:03               ` Catalin Marinas
2014-12-08 17:01                 ` Arend van Spriel
2014-12-09 10:19                   ` Arend van Spriel
2014-12-09 10:29                     ` Russell King - ARM Linux
2014-12-09 11:07                       ` Arend van Spriel
2014-12-09 11:54                       ` Catalin Marinas
2015-01-20 15:22                       ` Fabio Estevam
2014-12-08 16:22               ` Arend van Spriel
2014-12-08 16:38                 ` Arnd Bergmann
2014-12-08 16:47                   ` Russell King - ARM Linux
2014-12-08 16:50                   ` Catalin Marinas
2014-12-08 16:54                     ` Russell King - ARM Linux
2014-12-05 15:06         ` Russell King - ARM Linux
2014-12-05 18:28           ` Catalin Marinas
2014-12-05 19:22             ` Arend van Spriel
2014-12-05 19:25               ` Russell King - ARM Linux
2014-12-05 12:43   ` Arend van Spriel
2014-12-05 12:59     ` Russell King - ARM Linux
2014-12-05  9:52 ` Arnd Bergmann
2014-12-05 11:11   ` Russell King - ARM Linux
2014-12-05 11:49     ` Hante Meuleman
2014-12-05 17:38     ` Catalin Marinas
2014-12-05 18:24       ` Russell King - ARM Linux
2014-12-05 18:31         ` Catalin Marinas
2014-12-05 18:39 ` Catalin Marinas
2014-12-05 18:53   ` Catalin Marinas
2014-12-05 19:50     ` Arend van Spriel
2014-12-08 12:55     ` Johannes Stezenbach
2014-12-08 15:55       ` Catalin Marinas
2014-12-08 16:50         ` Johannes Stezenbach

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