From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from void.printf.net (void.printf.net [89.145.121.20]) (using TLSv1 with cipher AES256-SHA (256/256 bits)) (Client did not present a certificate) by ozlabs.org (Postfix) with ESMTPS id 8B8E82C008A for ; Wed, 12 Sep 2012 06:59:18 +1000 (EST) From: Chris Ball To: Kumar Gala Subject: Re: [PATCH 2/3] powerpc/esdhc: add property to disable the CMD23 References: <1347347565-17474-1-git-send-email-Chang-Ming.Huang@freescale.com> <1347347565-17474-2-git-send-email-Chang-Ming.Huang@freescale.com> <20120911075429.GA27028@lizard> <20120911080457.GA28235@lizard> <110EED8CC96DFC488B7E717A2027A27C176170@039-SN1MPN1-002.039d.mgd.msft.net> <6D8C87BA-CA06-4215-94F5-63EBF5162B0A@kernel.crashing.org> <2A6FCAE3-288F-4972-90C0-15105932F13E@kernel.crashing.org> <87k3w0y5yn.fsf@octavius.laptop.org> Date: Tue, 11 Sep 2012 16:59:07 -0400 In-Reply-To: (Kumar Gala's message of "Tue, 11 Sep 2012 15:26:32 -0500") Message-ID: <87liggwa1w.fsf@octavius.laptop.org> MIME-Version: 1.0 Content-Type: text/plain Cc: linux-mmc@vger.kernel.org, Huang Changming-R66093 , "linuxppc-dev@lists.ozlabs.org list" , Anton Vorontsov List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Hi, On Tue, Sep 11 2012, Kumar Gala wrote: > thanks for the info. Do you know what's required on controller side > to handle cards that support CMD23? > > I'm trying to figure out if older controller's on FSL SoCs are missing > some feature to allow CMD23 to work (vs Auto-CMD23). It seems plausible that it's just not implemented on these controllers. It's a little strange, since the command's been specified for so long and we haven't seen any other controllers with problems. The patch would be correct if this is true. - Chris. -- Chris Ball One Laptop Per Child