From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from gate.crashing.org (gate.crashing.org [63.228.1.57]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (Client did not present a certificate) by ozlabs.org (Postfix) with ESMTPS id A25252C007D for ; Wed, 12 Sep 2012 22:13:53 +1000 (EST) Subject: Re: [PATCH 2/3] powerpc/esdhc: add property to disable the CMD23 Mime-Version: 1.0 (Apple Message framework v1278) Content-Type: text/plain; charset=us-ascii From: Kumar Gala In-Reply-To: <110EED8CC96DFC488B7E717A2027A27C17701A@039-SN1MPN1-002.039d.mgd.msft.net> Date: Wed, 12 Sep 2012 07:13:41 -0500 Message-Id: <8B1F0805-759E-417A-B787-40DF197896F3@kernel.crashing.org> 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> <87liggwa1w.fsf@octavius.laptop.org> <110EED8CC96DFC488B7E717A2027A27C17701A@039-SN1MPN1-002.039d.mgd.msft.net> To: Huang Changming-R66093 Cc: "linux-mmc@vger.kernel.org" , Chris Ball , "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: , On Sep 12, 2012, at 1:18 AM, Huang Changming-R66093 wrote: >=20 >=20 > Best Regards > Jerry Huang >=20 >=20 >> -----Original Message----- >> From: Chris Ball [mailto:cjb@laptop.org] >> Sent: Wednesday, September 12, 2012 4:59 AM >> To: Kumar Gala >> Cc: Huang Changming-R66093; linuxppc-dev@lists.ozlabs.org list; = linux- >> mmc@vger.kernel.org; Anton Vorontsov >> Subject: Re: [PATCH 2/3] powerpc/esdhc: add property to disable the = CMD23 >>=20 >> Hi, >>=20 >> 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? >>>=20 >>> 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). >>=20 >> 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. >>=20 >=20 > I didn't find any description about it, but after testing on FSL = silicones, I got this result: > Some silicones support this command, and some silicones don't support = it, which will cause I/O error. Can you list out which SoCs support it and which don't. Having this = list will be useful in understanding which controller versions supported = it. - k=