From mboxrd@z Thu Jan 1 00:00:00 1970 From: Santosh Shilimkar Subject: Re: [PATCH 2/3] ARM: OMAP2+: hwmod: add support for blocking WFI when a device is active Date: Mon, 31 Dec 2012 13:55:54 +0530 Message-ID: <50E14C12.5020105@ti.com> References: <20121230182745.30526.47072.stgit@dusk.lan> <20121230182829.30526.32914.stgit@dusk.lan> Mime-Version: 1.0 Content-Type: text/plain; charset="ISO-8859-1"; format=flowed Content-Transfer-Encoding: 7bit Return-path: Received: from comal.ext.ti.com ([198.47.26.152]:49153 "EHLO comal.ext.ti.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751579Ab2LaIZG (ORCPT ); Mon, 31 Dec 2012 03:25:06 -0500 In-Reply-To: <20121230182829.30526.32914.stgit@dusk.lan> Sender: linux-omap-owner@vger.kernel.org List-Id: linux-omap@vger.kernel.org To: Paul Walmsley Cc: linux-omap@vger.kernel.org, linux-arm-kernel@lists.infradead.org Paul, On Sunday 30 December 2012 11:58 PM, Paul Walmsley wrote: > Apparently, on some OMAPs, the MPU can't be allowed to enter WFI while > certain peripherals are active. It's not clear why, and it's likely > that there is simply some other bug in the driver or integration code. > But since the likelihood that anyone will have the time to track these > problems down in the future seems quite small, we'll provide a > flag, HWMOD_BLOCK_WFI, to mark these issues in the hwmod data. > > Signed-off-by: Paul Walmsley > --- This is more of question. If the limitation is w.r.t MPU power state then shouldn't we just prevent the MPU power state rather than blocking the WFI completely. Can you please clarify if retaining MPU power state in ON can achieve the same results ? Regards Santosh