From mboxrd@z Thu Jan 1 00:00:00 1970 From: Ulf Hansson Subject: Re: [PATCH] mmc: core: Add option to prevent eMMC sleep command Date: Wed, 14 Dec 2011 16:34:19 +0100 Message-ID: <4EE8C1FB.5080205@stericsson.com> References: <1323876036-10206-1-git-send-email-ulf.hansson@stericsson.com> <000601ccba74$afdb0180$0f910480$@org> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii"; format=flowed Content-Transfer-Encoding: 7bit Return-path: Received: from eu1sys200aog116.obsmtp.com ([207.126.144.141]:39881 "EHLO eu1sys200aog116.obsmtp.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751974Ab1LNPek (ORCPT ); Wed, 14 Dec 2011 10:34:40 -0500 In-Reply-To: <000601ccba74$afdb0180$0f910480$@org> Sender: linux-mmc-owner@vger.kernel.org List-Id: linux-mmc@vger.kernel.org To: Subhash Jadavani Cc: "linux-mmc@vger.kernel.org" , 'Chris Ball' , Per FORLIN , Johan RUDHOLM , 'Lee Jones' Subhash Jadavani wrote: > Why is this patch needed? Do you see any issue with eMMC sleep on particular > cards? > > Regards, > Subhash Suppose the eMMC is put in sleep state when doing suspend, at that point the kernel crashes. The kernel crash is supposed to be dumped to the same eMMC by some other software than the kernel itself. But this software do not have support for waking up the eMMC from sleep and is thus not able to store the dump. Br Ulf Hansson