From mboxrd@z Thu Jan 1 00:00:00 1970 From: Tony Lindgren Subject: Re: Fail to enter retention Date: Mon, 17 Nov 2014 10:09:46 -0800 Message-ID: <20141117180944.GG7046@atomide.com> References: <20141117162209.GE7046@atomide.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Return-path: Received: from mho-03-ewr.mailhop.org ([204.13.248.66]:58235 "EHLO mho-01-ewr.mailhop.org" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1751283AbaKQSKJ (ORCPT ); Mon, 17 Nov 2014 13:10:09 -0500 Content-Disposition: inline In-Reply-To: Sender: linux-omap-owner@vger.kernel.org List-Id: linux-omap@vger.kernel.org To: Ran Shalit Cc: linux-omap@vger.kernel.org * Ran Shalit [141117 09:14]: > Hi Tony, > > Thanks very much for suggestions, > I am able to wakeup the uart (though it takes about 10 seconds till it wakeup). The wake-up should happen within few hundred milliseconds at most. Sounds like you're waking on some timer event instead. > Do you have any suggestion, how I can understnad why it did not get > into retention and how to continue from this point ? You need to look if you have some devices blocking deeper idle states in cm_idlest*_core and cm_idlest_per registers. The device will automatically idle whatever it can if there are no blockers. I believe at least EHCI still is blocking, and MUSB if configured and cable connected. Regards, Tony