From mboxrd@z Thu Jan 1 00:00:00 1970 From: Jaehoon Chung Subject: Re: [RFC] improve mmc init sequence Date: Thu, 17 Mar 2016 19:55:57 +0900 Message-ID: <56EA8D3D.3080502@samsung.com> References: <56EA2758.7090200@rock-chips.com> Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 7bit Return-path: Received: from mailout3.samsung.com ([203.254.224.33]:59627 "EHLO mailout3.samsung.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S935694AbcCQK4A (ORCPT ); Thu, 17 Mar 2016 06:56:00 -0400 Received: from epcpsbgr4.samsung.com (u144.gpu120.samsung.co.kr [203.254.230.144]) by mailout3.samsung.com (Oracle Communications Messaging Server 7.0.5.31.0 64bit (built May 5 2014)) with ESMTP id <0O4602V7CJPA0710@mailout3.samsung.com> for linux-mmc@vger.kernel.org; Thu, 17 Mar 2016 19:55:58 +0900 (KST) In-reply-to: Sender: linux-mmc-owner@vger.kernel.org List-Id: linux-mmc@vger.kernel.org To: Ulf Hansson , Shawn Lin Cc: linux-mmc On 03/17/2016 07:43 PM, Ulf Hansson wrote: > On 17 March 2016 at 04:41, Shawn Lin wrote: >> Hello Ulf, >> I notice we add MMC_CAP2_NO_SDIO to avoid sending sdio commands >> during initialization. So that means we can use it to improve mmc init >> sequence if a specific board use one slot just for emmc or sd. But I realize >> that we can move a step further to add more cap2 like NO_SD/ >> NO_MMC in order to reduce the boot time. Does that make sense? If the >> answer is *yes*, I am happy to push some patches for it since I have >> been doing it on my local tree and testing for a long time. > > I am not against it, so please go ahead! > > Although, you need to give some proof of the amount of saved boot time > (or better the decreased initialization time of a couple of different > cards). I have already tested with similar sequence..I have remembered there is a benefit for decreasing the booting time. But i didn't remember how much time is decreased...because it wast too long time ago. Best Regards, Jaehoon Chung > > Kind regards > Uffe > -- > To unsubscribe from this list: send the line "unsubscribe linux-mmc" in > the body of a message to majordomo@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html > >