Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756747Ab3JKIts (ORCPT ); Fri, 11 Oct 2013 04:49:48 -0400 Received: from bear.ext.ti.com ([192.94.94.41]:45216 "EHLO bear.ext.ti.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751527Ab3JKItn (ORCPT ); Fri, 11 Oct 2013 04:49:43 -0400 Message-ID: <5257BB8C.5080001@ti.com> Date: Fri, 11 Oct 2013 11:49:16 +0300 From: Roger Quadros User-Agent: Mozilla/5.0 (X11; Linux i686; rv:16.0) Gecko/20121011 Thunderbird/16.0.1 MIME-Version: 1.0 To: Tony Lindgren CC: , , Grygorii Strashko , Linus Walleij , , Peter Ujfalusi , Prakash Manjunathappa , Haojian Zhuang , =?ISO-8859-1?Q?Beno=EEt_Cousson?= , Subject: Re: [PATCH 4/6] pinctrl: single: Add support for wake-up interrupts References: <20131003054104.8941.88857.stgit@localhost> <20131003054221.8941.87801.stgit@localhost> <5256AA7F.8030005@ti.com> <20131010160018.GA29913@atomide.com> In-Reply-To: <20131010160018.GA29913@atomide.com> Content-Type: text/plain; charset="ISO-8859-1" Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2056 Lines: 46 On 10/10/2013 07:00 PM, Tony Lindgren wrote: > * Roger Quadros [131010 06:32]: >> >> I tried testing this with the USB EHCI driver, but I'm not getting wake up interrupts >> while the system is still running and only the EHCI controller is runtime suspended. >> >> It seems we need to somehow call _reconfigure_io_chain() to update the daisy chain >> whenever the pad wakeup_enable bit is changed. > > Sounds like this is on omap3? Have you tried calling pcs_soc->rearm() in the > pcs_irq_handle() like the comments there suggest? At least for me that keeps > the wake-up interrupts continuously running on omap3 instead of just idle modes. Yes it is on OMAP3. I haven't tried with pcs_soc->rearm(). I will give it a try and let you know. > > Now on omap4, I've noticed the wake up interrupts are on all the time based on tests > with the serial driver. > >> I think pcs_irq_set_wake() is where need to control system wakeup behaviour for the irq. >> This is where we should be able to change WAKEUP_EN bit of the pad >> to enable/disable system wakeup for that pad and also call _reconfigure_io_chain(). > > Well the irq_set_wake() should only be needed for suspend and resume. For runtime PM > the wake-events should be always enabled by default as pointed out by Alan Stern > a while back. Right, but we need to update the WAKEUP_EN bit in the pad control register for that to work, no?. This is something we are not doing in the driver. > >> This would mean that we don't really need to set WAKEUP_EN for the pads in the DTS file. > > Well for runtime PM, we should also do the automatic handling if configured. > But how to do that best is still open.. I didn't get this part. I was thinking that irq_set_wake() should map directly to WAKEUP_EN bit for the pin. cheers, -roger -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/