From mboxrd@z Thu Jan  1 00:00:00 1970
From: u.kleine-koenig@pengutronix.de (Uwe =?iso-8859-1?Q?Kleine-K=F6nig?=)
Date: Thu, 15 Sep 2011 09:14:27 +0200
Subject: gpio_ensure_requested error on mx31pdk boot
In-Reply-To: <CAOMZO5AmM2yd5FopjNO9QsPNLZiBNH3U29_xXPV3cnZnB9EjtQ@mail.gmail.com>
References: <CAOMZO5AmM2yd5FopjNO9QsPNLZiBNH3U29_xXPV3cnZnB9EjtQ@mail.gmail.com>
Message-ID: <20110915071427.GD11297@pengutronix.de>
To: linux-arm-kernel@lists.infradead.org
List-Id: linux-arm-kernel.lists.infradead.org

On Thu, Sep 15, 2011 at 12:39:07AM -0300, Fabio Estevam wrote:
> Hi,
> 
> On a MX31PDK running 3.1-rc3 from Pengutronix's imx-features branch I
> get the following:
> 
> Registering mxc_nand as whole device
> ------------[ cut here ]------------
> WARNING: at drivers/gpio/gpiolib.c:101 gpio_ensure_requested+0x4c/0xf4()
> autorequest GPIO-0
> Modules linked in:
> [<c0014410>] (unwind_backtrace+0x0/0xf4) from [<c0025754>] (warn_slowpath_common
> +0x4c/0x64)
> [<c0025754>] (warn_slowpath_common+0x4c/0x64) from [<c0025800>] (warn_slowpath_f
> mt+0x30/0x40)
> [<c0025800>] (warn_slowpath_fmt+0x30/0x40) from [<c0198688>] (gpio_ensure_reques
> ted+0x4c/0xf4)
> [<c0198688>] (gpio_ensure_requested+0x4c/0xf4) from [<c01988c8>] (gpio_direction
> _output+0xa0/0x138)
> [<c01988c8>] (gpio_direction_output+0xa0/0x138) from [<c01ed198>] (spi_imx_setup
> +0x38/0x4c)
> [<c01ed198>] (spi_imx_setup+0x38/0x4c) from [<c01eb5d0>] (spi_setup+0x38/0x50)
> [<c01eb5d0>] (spi_setup+0x38/0x50) from [<c01eb85c>] (spi_add_device+0x94/0x124)
> [<c01eb85c>] (spi_add_device+0x94/0x124) from [<c01eb960>] (spi_new_device+0x74/
> 0xac)
> [<c01eb960>] (spi_new_device+0x74/0xac) from [<c01eb9b8>] (spi_match_master_to_b
> oardinfo+0x20/0x40)
> [<c01eb9b8>] (spi_match_master_to_boardinfo+0x20/0x40) from [<c01eba88>] (spi_re
> gister_master+0xb0/0x104)
> [<c01eba88>] (spi_register_master+0xb0/0x104) from [<c01ec0b4>] (spi_bitbang_sta
> rt+0x104/0x17c)
> [<c01ec0b4>] (spi_bitbang_start+0x104/0x17c) from [<c02c2c4c>] (spi_imx_probe+0x
> 2fc/0x404)
> [<c02c2c4c>] (spi_imx_probe+0x2fc/0x404) from [<c01c2498>] (platform_drv_probe+0
> x18/0x1c)
> [<c01c2498>] (platform_drv_probe+0x18/0x1c) from [<c01c1058>] (driver_probe_devi
> ce+0x78/0x174)
> [<c01c1058>] (driver_probe_device+0x78/0x174) from [<c01c11e0>] (__driver_attach
> +0x8c/0x90)
> [<c01c11e0>] (__driver_attach+0x8c/0x90) from [<c01c0860>] (bus_for_each_dev+0x6
> 0/0x8c)
> [<c01c0860>] (bus_for_each_dev+0x60/0x8c) from [<c01c0088>] (bus_add_driver+0xa0
> /0x288)
> [<c01c0088>] (bus_add_driver+0xa0/0x288) from [<c01c179c>] (driver_register+0x78
> /0x18c)
> [<c01c179c>] (driver_register+0x78/0x18c) from [<c0008490>] (do_one_initcall+0x3
> 4/0x178)
> [<c0008490>] (do_one_initcall+0x34/0x178) from [<c03a5204>] (kernel_init+0x74/0x
> 118)
> [<c03a5204>] (kernel_init+0x74/0x118) from [<c000f65c>] (kernel_thread_exit+0x0/
> 0x8)
> ---[ end trace 759f924b30fd5a44 ]---
> 
> I have not started debugging yet, but just wondering if anyone else
> has seen this.
I havn't seen it. Just in case you don't know, that means a gpio was
used without being (successfully) requested. On the other hand I wonder
if GPIO-0 is correct here?!

BTW, the master branch on the imx repo contains all current work, that
is for-next + two fixes that won't enter mainline via the imx repo.
That's probably the better branch to use.

Best regards
Uwe

-- 
Pengutronix e.K.                           | Uwe Kleine-K?nig            |
Industrial Linux Solutions                 | http://www.pengutronix.de/  |