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Thu, 12 Apr 2018 15:02:13 +0100 Received: from linux by n2100.armlinux.org.uk with local (Exim 4.90_1) (envelope-from ) id 1f6cnd-00031C-IE; Thu, 12 Apr 2018 15:02:05 +0100 Date: Thu, 12 Apr 2018 15:02:01 +0100 From: Russell King - ARM Linux To: Linus Walleij Subject: Re: [PATCH] ARM: Assume maintainership of ARM reference designs Message-ID: <20180412140201.GI16141@n2100.armlinux.org.uk> References: <20180412131426.18011-1-linus.walleij@linaro.org> <20180412131737.GF16141@n2100.armlinux.org.uk> <20180412131845.GG16141@n2100.armlinux.org.uk> <20180412135201.GH16141@n2100.armlinux.org.uk> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.5.23 (2014-03-12) X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20180412_070230_952511_6D990D35 X-CRM114-Status: GOOD ( 17.90 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Rob Herring , Wolfram Sang , Stephen Boyd , Michael Turquette , Will Deacon , Marc Zyngier , arm-soc , Mark Brown , Brian Norris , Linux ARM Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org X-Virus-Scanned: ClamAV using ClamSMTP On Thu, Apr 12, 2018 at 03:59:20PM +0200, Linus Walleij wrote: > On Thu, Apr 12, 2018 at 3:52 PM, Russell King - ARM Linux > wrote: > > The Versatile Express > > CT9x4 is still part of the boot farm, and just about works with > > certain kernels, but I'm pretty sure there's a cache latency bug > > there (I carry patches privately to fix it, but it doesn't appear to > > completely solve it.) > > So there is a bug in it! I thought it was only my board. I'm not sure if it's a hardware bug or not... This patch seems to help immensely, but doesn't completely solve the problem: diff --git a/arch/arm/boot/dts/vexpress-v2p-ca9.dts b/arch/arm/boot/dts/vexpress-v2p-ca9.dts index 5814460e0549..56308c1c0208 100644 --- a/arch/arm/boot/dts/vexpress-v2p-ca9.dts +++ b/arch/arm/boot/dts/vexpress-v2p-ca9.dts @@ -174,7 +174,7 @@ cache-unified; cache-level = <2>; arm,data-latency = <1 1 1>; - arm,tag-latency = <1 1 1>; + arm,tag-latency = <2 2 1>; }; pmu {