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(p=none dis=none) header.from=i2se.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=desiato.20200630; h=Sender:Content-Transfer-Encoding :Content-Type:List-Subscribe:List-Help:List-Post:List-Archive: List-Unsubscribe:List-Id:In-Reply-To:MIME-Version:Date:Message-ID:From: References:Cc:To:Subject:Reply-To:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=wei4XFHoDLmHo7ZVRRNJM9iudWVcPSc2oPW25iq5OSA=; b=AGDuredRTn1iOcBwAdoafcOOM Se+OT2q6kK0hSJatXssohJkwZEPmhYuhXtqIeYD7Efhv9rwA6+yWGVRmtoysDiDJ3gFviPiuqzSIm GmO3AonE50EQJflvLfAL5SdyH7rbpdsKm0Tt/pIqBwHbEZgAksdXINytDoJ9WIurUuFOsmp9V55wg CHWgPPyVk7wC3J9HH/3s3Ra2ULH8vFbuk8MeaS/X5Pqz1WZ9T3U3Dc5TWsVNEbNrpyJkpARx++BBC 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epLdYbzXnB4rAjOq3PAjN139K7RBSY8XXGk8pUuzTJuBHZ3ZPEj2FCYYXb5lmxS3OlwFJS5Vw3qaH gRUIQkDPmmnuCAm6mYgqO+Ffl/GZOKJstMkrqOzFnuZbr3vwKGvPhoiHfLeJWkSfvsBSA4SBLKqaw 1Y2WcJdQ==; Received: from mout.kundenserver.de ([212.227.17.10]) by bombadil.infradead.org with esmtps (Exim 4.94 #2 (Red Hat Linux)) id 1lUvsg-004jEh-Ah; Fri, 09 Apr 2021 18:29:24 +0000 Received: from [192.168.1.107] ([37.4.249.89]) by mrelayeu.kundenserver.de (mreue107 [212.227.15.183]) with ESMTPSA (Nemesis) id 1Mr8SG-1lsSS30XTi-00oBc1; Fri, 09 Apr 2021 20:29:01 +0200 Subject: Re: [PATCH 4/4] ARM: dts: Fix-up EMMC2 controller's frequency To: Nicolas Saenz Julienne , Alan Cooper , Florian Fainelli , Scott Branden Cc: Nicolas Saenz Julienne , "moderated list:BROADCOM BCM7XXX ARM ARCHITECTURE" , linux-mmc , DTML , BCM Kernel Feedback , linux-rpi-kernel@lists.infradead.org, phil@raspberrypi.com, Tim Gover , Adrian Hunter , Linux Kernel Mailing List , Ulf Hansson , Rob Herring References: <20210322185816.27582-1-nsaenz@kernel.org> 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Nicolas Saenz Julienne: > Hi again, > > On Wed, 2021-04-07 at 16:37 -0400, Alan Cooper wrote: >> Nicolas, >> >> I got a better description of the failure and it looks like the bus >> clock needs to be limited to 300KHz for a 500MHz core clock. >> What's happening is that an internal reset sequence is needed after a >> command timeout and the reset signal needs to be asserted for at least >> 2 ticks of the bus clock. This is done using a 12 bit counter clocked >> by the core clock. That means a 500MHz core clock produces a 122KHz >> reset signal which is too fast for 2 ticks of the 200KHz bus clock >> (100KHz) but is okay for the 300KHz (150Khz) bus clock. > Is there any value in implementing this in a generic way? i don't have any idea which callback could manipulate the reset duration. Limiting the min clk frequency looks like the less invasive solution to me. Touching the DT isn't recommend. Best regards _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel