Return-path: Received: from arroyo.ext.ti.com ([192.94.94.40]:60200 "EHLO arroyo.ext.ti.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751825Ab2F1Xx6 (ORCPT ); Thu, 28 Jun 2012 19:53:58 -0400 Message-ID: <4FECEE9A.5070300@ti.com> (sfid-20120629_015407_649997_3637E238) Date: Thu, 28 Jun 2012 18:54:02 -0500 From: Jon Hunter MIME-Version: 1.0 To: Franky Lin CC: Kevin Hilman , , , "linux-wireless@vger.kernel.org" , , , , , "linux-arm-kernel@lists.infradead.org" Subject: Re: Panda ES board hang when using GPIO as interrupt References: <4FE8CF77.5080400@broadcom.com> <87txxxs9we.fsf@ti.com> <4FEBA854.5010508@broadcom.com> <4FEC7B48.8040402@ti.com> <4FECCB91.7090609@broadcom.com> <4FECD2E5.1060603@ti.com> <4FECE067.7000809@broadcom.com> <4FECE1BD.80906@ti.com> <4FECE45E.6040506@broadcom.com> In-Reply-To: <4FECE45E.6040506@broadcom.com> Content-Type: text/plain; charset="ISO-8859-1" Sender: linux-wireless-owner@vger.kernel.org List-ID: On 06/28/2012 06:10 PM, Franky Lin wrote: > On 06/28/2012 03:59 PM, Jon Hunter wrote: >> >> On 06/28/2012 05:53 PM, Franky Lin wrote: >>> I found one interesting thing. When I added the print info to see when >>> runtime_suspend/resume get called, it seems like the suspend/resume is >>> unbalance during boot. Resume got called more than suspend. So I hack >>> the code to make sure suspend and resume are called in pair. A resume >>> without suspend will do nothing and return immediately. This also makes >>> the hang vanish. >> >> I am not 100% sure I follow. On boot I would expect to see a >> resume/suspend due to the probe on the irq bank and then I would expect >> to see another resume from the acquisition of the gpio, however, I would >> not expect a suspend until the gpio is freed, which I don't believe you >> are doing. >> >> Can you share your hack? Just paste the diff? This may help me >> understand more. >> > > OK. > This is what I saw in the log: > [ 0.171844] dummy: > [ 0.172912] NET: Registered protocol family 16 > [ 0.173431] GPMC revision 6.0 > [ 0.173492] gpmc: irq-52 could not claim: err -22 > [ 0.177551] ??????omap_gpio_runtime_resume > [ 0.178619] OMAP GPIO hardware version 0.1 > [ 0.178649] !!!!!omap_gpio_runtime_suspend > [ 0.178771] ??????omap_gpio_runtime_resume > [ 0.179351] !!!!!omap_gpio_runtime_suspend > [ 0.179504] ??????omap_gpio_runtime_resume > [ 0.180023] !!!!!omap_gpio_runtime_suspend > [ 0.180145] ??????omap_gpio_runtime_resume > [ 0.180694] !!!!!omap_gpio_runtime_suspend > [ 0.180847] ??????omap_gpio_runtime_resume > [ 0.181365] !!!!!omap_gpio_runtime_suspend > [ 0.181518] ??????omap_gpio_runtime_resume > [ 0.182037] !!!!!omap_gpio_runtime_suspend > [ 0.185089] omap_mux_init: Add partition: #1: core, flags: 2 > [ 0.186462] omap_mux_init: Add partition: #2: wkup, flags: 2 > [ 0.186584] error setting wl12xx data: -38 > [ 0.189788] _omap_mux_get_by_name: Could not find signal > uart1_rx.uart1_rx > [ 0.189788] _omap_mux_get_by_name: Could not find signal > uart1_rx.uart1_rx > [ 0.239501] ??????omap_gpio_runtime_resume > [ 0.239532] ??????omap_gpio_runtime_resume > [ 0.241058] usbhs_omap: alias fck already exists > [ 0.244781] ??????omap_gpio_runtime_resume I am wondering if this could be the bug ... on start-up I see that we do a context restore on bank1 during the probe which is before we have done the first suspend! In other words, we could restore a bad/uninitialised context for bank1. In the case of bank1, the loss count starts at 1 and not 0 and so we falsely think we need to perform a restore :-( [ 0.176269] omap_gpio_runtime_resume: bank @ 0xfc310000 [ 0.177276] omap_gpio_runtime_resume: count 0, now 1 [ 0.177276] gpiochip_add: registered GPIOs 0 to 31 on device: gpio [ 0.177642] omap_gpio_runtime_suspend: bank @ 0xfc310000 Can you try ... diff --git a/drivers/gpio/gpio-omap.c b/drivers/gpio/gpio-omap.c index c4ed172..9623408 100644 --- a/drivers/gpio/gpio-omap.c +++ b/drivers/gpio/gpio-omap.c @@ -1086,6 +1086,9 @@ static int __devinit omap_gpio_probe(struct platform_device *pdev) #ifdef CONFIG_OF_GPIO bank->chip.of_node = of_node_get(node); #endif + if (bank->get_context_loss_count) + bank->context_loss_count = + bank->get_context_loss_count(bank->dev); bank->irq_base = irq_alloc_descs(-1, 0, bank->width, 0); if (bank->irq_base < 0) { Thanks Jon