From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751342AbcEITgc (ORCPT ); Mon, 9 May 2016 15:36:32 -0400 Received: from muru.com ([72.249.23.125]:53725 "EHLO muru.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751033AbcEITga (ORCPT ); Mon, 9 May 2016 15:36:30 -0400 Date: Mon, 9 May 2016 12:36:24 -0700 From: Tony Lindgren To: Ivaylo Dimitrov Cc: robh+dt@kernel.org, pawel.moll@arm.com, mark.rutland@arm.com, ijc+devicetree@hellion.org.uk, galak@codeaurora.org, thierry.reding@gmail.com, bcousson@baylibre.com, linux@arm.linux.org.uk, mchehab@osg.samsung.com, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-pwm@vger.kernel.org, linux-omap@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-media@vger.kernel.org, sre@kernel.org, pali.rohar@gmail.com Subject: Re: [PATCH 5/7] ARM: OMAP: dmtimer: Do not call PM runtime functions when not needed. Message-ID: <20160509193624.GH5995@atomide.com> References: <1462634508-24961-1-git-send-email-ivo.g.dimitrov.75@gmail.com> <1462634508-24961-6-git-send-email-ivo.g.dimitrov.75@gmail.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1462634508-24961-6-git-send-email-ivo.g.dimitrov.75@gmail.com> User-Agent: Mutt/1.5.24 (2015-08-30) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org * Ivaylo Dimitrov [160507 08:24]: > once omap_dm_timer_start() is called, which calls omap_dm_timer_enable() > and thus pm_runtime_get_sync(), it doesn't make sense to call PM runtime > functions again before omap_dm_timer_stop is called(). Otherwise PM runtime > functions called in omap_dm_timer_enable/disable lead to long and unneeded > delays. > > Fix that by implementing an "enabled" counter, so the PM runtime functions > get called only when really needed. > > Without that patch Nokia N900 IR TX driver (ir-rx51) does not function. We should use pm_runtime for the refcounting though and call PM runtime unconditionally. Can you try to follow the standard PM runtime usage like this: init: pm_runtime_use_autosuspend(&timer->pdev->dev); pm_runtime_set_autosuspend_delay(&timer->pdev->dev, 200); pm_runtime_enable(&timer->pdev->dev); ... enable: pm_runtime_get_sync(&timer->pdev->dev); ... disable: pm_runtime_mark_last_busy(&timer->pdev->dev); pm_runtime_put_autosuspend(&timer->pdev->dev); ... exit: pm_runtime_dont_use_autosuspend(&timer->pdev->dev); pm_runtime_put_sync(&timer->pdev->dev); pm_runtime_disable(&timer->pdev->dev); No idea what the timeout should be, maybe less than 200 ms. Also we need to test that off idle still works with timer1, that might need special handling. Regards, Tony