Message-ID: <CAC83ZvKnOw+UBOWYtt294k-5Xk8S6Gy1pChSF7aXGmGjLGSeCA@mail.gmail.com>
Date:	Mon, 30 Jul 2012 15:04:19 +0530
From:	"DebBarma, Tarun Kanti" <tarun.kanti@...com>
To:	"Poddar, Sourav" <sourav.poddar@...com>
Cc:	lo <linux-omap@...r.kernel.org>,
	Santosh Shilimkar <santosh.shilimkar@...com>,
	Benoit Cousson <b-cousson@...com>,
	linux-kernel@...r.kernel.org, Felipe Balbi <balbi@...com>
Subject: Re: [GPIO] Crashed when not using

Sourav,

On Mon, Jul 30, 2012 at 2:13 PM, Poddar, Sourav <sourav.poddar@...com> wrote:
> Hi All,
>
> I tried using gpio as an interrupt line for my driver
> (drivers/staging/iio/light/tsl2x7x_core.c) for omap5.
> The interrupt line number was directly passed to the driver using
> device tree. But what I observed
> is the following crash..
>
>
> [    1.599273] mousedev: PS/2 mouse device common for all mice
> [    1.607513] i2c /dev entries driver
> [    1.613739] Driver for 1-wire Dallas network protocol.
> [    1.622650] usbcore: registered new interface driver usbhid
> [    1.628540] usbhid: USB HID core driver
> [    1.633728] Unhandled fault: imprecise external abort (0x1406) at 0x00000000
> [    1.641113] Internal error: : 1406 [#1] SMP ARM
> [    1.645874] Modules linked in:
> [    1.649078] CPU: 0    Not tainted  (3.5.0-02045-g0b474d6-dirty #415)
> [    1.655761] PC is at _set_gpio_triggering+0x44/0x264
> [    1.660980] LR is at gpio_irq_type+0xb8/0x160
> [    1.665527] pc : [<c02dbb68>]    lr : [<c02dc2dc>]    psr: 60000093
> [    1.665527] sp : dc851df0  ip : c07a8f00  fp : 00000000
> [    1.677581] r10: 00000081  r9 : 00000000  r8 : dc8ffc10
> [    1.683074] r7 : 20000093  r6 : 00000000  r5 : 00000001  r4 : fa05b000
> [    1.689910] r3 : dc8ffc10  r2 : 00000002  r1 : 00000002  r0 : 00000140
> [    1.696746] Flags: nZCv  IRQs off  FIQs on  Mode SVC_32  ISA ARM
> Segment kernel
> [    1.704528] Control: 10c53c7d  Table: 8000406a  DAC: 00000017
> [    1.710540] Process swapper/0 (pid: 1, stack limit = 0xdc8502f8)
> [    1.716857] Stack: (0xdc851df0 to 0xdc852000)
> [    1.721405] 1de0:                                     00000002
> c0731280 dc8ffc6c 20000093
> [    1.730010] 1e00: c02dc224 c0731280 dc8d4980 00000000 c07a8e50
> 00000141 00000002 c00a37b8
> [    1.738586] 1e20: 00002002 c0731280 dc8d4980 00000141 c07312d4
> c07312b4 40000013 c00a3d7c
> [    1.747161] 1e40: 00000141 c06728c0 00000000 c0090578 c247f000
> c00a2d5c c0412258 00000141
> [    1.755737] 1e60: c0731280 c0537818 dc8d4980 c00a3fe4 c07bf6a0
> 00002002 c071bed8 c247f000
> [    1.764312] 1e80: dc9df000 00000004 c07bf6a0 dc9df020 c247f3c0
> c04ea344 c06728c0 c247f000
> [    1.772888] 1ea0: 00000000 09090578 c07bf6a0 dc9df004 dc9df000
> c04ea194 00000091 c071bed8
> [    1.781494] 1ec0: c06f89f4 c03e13c0 c03e1314 dc9df020 c0d1afd8
> dc9df054 c07bf60c c03272ac
> [    1.790069] 1ee0: dc9df020 c07bf60c dc9df054 00000000 00000091
> c03274c0 c07bf60c dc851f08
> [    1.798645] 1f00: c032742c c0325b10 dc8f26a8 dc9ef790 00000000
> c07bf60c c07bcea8 c243d6c0
> [    1.807220] 1f20: 00000000 c0326240 c0672958 c02bce08 c07bf5e4
> c07bf60c c03e12a0 00000000
> [    1.815795] 1f40: 00000091 c071bed8 c06f89f4 c0327ab0 c07bf5e4
> 00000007 c07c8c40 00000000
> [    1.824401] 1f60: 00000091 c03e1738 00000000 dc850000 00000007
> c0008648 00000000 c112c9f0
> [    1.832977] 1f80: c06a6d58 c06f89f4 00000001 60000013 c06694c8
> 00000000 00000006 00000006
> [    1.841552] 1fa0: 60000013 c0700a20 00000007 c07c8c40 c06d020c
> 00000091 c071bed8 c0700a28
> [    1.850128] 1fc0: 00000000 c06d0380 00000006 00000006 c06d020c
> 00000000 00000000 c06d028c
> [    1.858703] 1fe0: c001548c 00000013 00000000 00000000 00000000
> c001548c 3f3f3f3f 3f3f3f3f
> [    1.867309] [<c02dbb68>] (_set_gpio_triggering+0x44/0x264) from
> [<c02dc224>] (gpio_irq_type+0x0/0x160)
> [    1.877075] [<c02dc224>] (gpio_irq_type+0x0/0x160) from [<00002002>] (0x2002)
> [    1.884552] Code: e3120008 11816006 01c66001 e7846000 (e593c0fc)
> [    1.890960] ------------[ cut here ]------------
> [    1.895812] WARNING: at arch/arm/mach-omap2/omap_l3_noc.c:113
> l3_interrupt_handler+0x184/0x1bc()
> [    1.905029] L3 custom error: MASTER:MPU TARGET:L4 PER2
> [    1.910430] Modules linked in:
> [    1.913635] [<c001bd5c>] (unwind_backtrace+0x0/0xf4) from
> [<c00414c4>] (warn_slowpath_common+0x4c/0x64)
> [    1.923492] [<c00414c4>] (warn_slowpath_common+0x4c/0x64) from
> [<c0041570>] (warn_slowpath_fmt+0x30/0x40)
> [    1.933563] [<c0041570>] (warn_slowpath_fmt+0x30/0x40) from
> [<c0035de4>] (l3_interrupt_handler+0x184/0x1bc)
> [    1.943786] [<c0035de4>] (l3_interrupt_handler+0x184/0x1bc) from
> [<c00a28b8>] (handle_irq_event_percpu+0x64/0x24c)
> [    1.954650] [<c00a28b8>] (handle_irq_event_percpu+0x64/0x24c) from
> [<c00a2adc>] (handle_irq_event+0x3c/0x5c)
> [    1.964965] [<c00a2adc>] (handle_irq_event+0x3c/0x5c) from
> [<c00a56a8>] (handle_fasteoi_irq+0x98/0x13c)
> [    1.974822] [<c00a56a8>] (handle_fasteoi_irq+0x98/0x13c) from
> [<c00a235c>] (generic_handle_irq+0x34/0x44)
> [    1.984863] [<c00a235c>] (generic_handle_irq+0x34/0x44) from
> [<c00153a0>] (handle_IRQ+0x4c/0xac)
> [    1.994110] [<c00153a0>] (handle_IRQ+0x4c/0xac) from [<c0008480>]
> (gic_handle_irq+0x2c/0x60)
> [    2.002960] [<c0008480>] (gic_handle_irq+0x2c/0x60) from
> [<c04f26e4>] (__irq_svc+0x44/0x60)
> [    2.011718] Exception stack(0xdc851c48 to 0xdc851c90)
> [    2.017028] 1c40:                   c07a87a0 00000000 dc851c80
> 00000000 c0743f80 dc851da8
> [    2.025604] 1c60: 00000001 00000001 dc851cd7 00000000 c02dbb6a
> c02dbb6c ffffffff dc851c90
> [    2.034179] 1c80: c04f2440 c04f2444 60000113 ffffffff
> [    2.039489] [<c04f26e4>] (__irq_svc+0x44/0x60) from [<c04f2444>]
> (_raw_spin_unlock_irq+0x28/0x2c)
> [    2.048797] [<c04f2444>] (_raw_spin_unlock_irq+0x28/0x2c) from
> [<c001871c>] (die+0xe0/0x324)
> [    2.057647] [<c001871c>] (die+0xe0/0x324) from [<c0008444>]
> (do_DataAbort+0x88/0x98)
> [    2.065765] [<c0008444>] (do_DataAbort+0x88/0x98) from [<c04f2664>]
> (__dabt_svc+0x44/0x80)
> [    2.074462] Exception stack(0xdc851da8 to 0xdc851df0)
> [    2.079742] 1da0:                   00000140 00000002 00000002
> dc8ffc10 fa05b000 00000001
> [    2.088317] 1dc0: 00000000 20000093 dc8ffc10 00000000 00000081
> 00000000 c07a8f00 dc851df0
> [    2.096893] 1de0: c02dc2dc c02dbb68 60000093 ffffffff
> [    2.102203] [<c04f2664>] (__dabt_svc+0x44/0x80) from [<c02dbb68>]
> (_set_gpio_triggering+0x44/0x264)
> [    2.111724] [<c02dbb68>] (_set_gpio_triggering+0x44/0x264) from
> [<c02dc224>] (gpio_irq_type+0x0/0x160)
> [    2.121490] [<c02dc224>] (gpio_irq_type+0x0/0x160) from [<00002002>] (0x2002)
> [    2.128967] ---[ end trace 8b4b88305e6b2aff ]---
> [    2.133911] ---[ end trace 8b4b88305e6b2b00 ]---
> [    2.138763] Kernel panic - not syncing: Attempted to kill init!
> exitcode=0x0000000b
> [    2.138763]
> [    2.148376] CPU1: stopping
> [    2.151214] [<c001bd5c>] (unwind_backtrace+0x0/0xf4) from
> [<c0019c74>] (handle_IPI+0x130/0x15c)
> [    2.160339] [<c0019c74>] (handle_IPI+0x130/0x15c) from [<c00084ac>]
> (gic_handle_irq+0x58/0x60)
> [    2.169372] [<c00084ac>] (gic_handle_irq+0x58/0x60) from
> [<c04f26e4>] (__irq_svc+0x44/0x60)
> [    2.178131] Exception stack(0xdc869e10 to 0xdc869e58)
> [    2.183410] 9e00:                                     00000000
> 00000000 00000002 60000113
> [    2.191986] 9e20: 00000000 dc868000 c07970e4 00000000 00000000
> 00000001 00000002 00000000
> [    2.200561] 9e40: 00000001 dc869e58 c00936f4 c0093704 60000113 ffffffff
> [    2.207489] [<c04f26e4>] (__irq_svc+0x44/0x60) from [<c0093704>]
> (lock_acquire+0xac/0x104)
> [    2.216156] [<c0093704>] (lock_acquire+0xac/0x104) from
> [<c007a8bc>] (rebalance_domains+0x5c/0x1a8)
> [    2.225646] [<c007a8bc>] (rebalance_domains+0x5c/0x1a8) from
> [<c007ae84>] (run_rebalance_domains+0x44/0x14c)
> [    2.235961] [<c007ae84>] (run_rebalance_domains+0x44/0x14c) from
> [<c004a864>] (__do_softirq+0xb4/0x214)
> [    2.245819] [<c004a864>] (__do_softirq+0xb4/0x214) from
> [<c004aba0>] (irq_exit+0x90/0x98)
> [    2.254394] [<c004aba0>] (irq_exit+0x90/0x98) from [<c0019c48>]
> (handle_IPI+0x104/0x15c)
> [    2.262878] [<c0019c48>] (handle_IPI+0x104/0x15c) from [<c00084ac>]
> (gic_handle_irq+0x58/0x60)
> [    2.271911] [<c00084ac>] (gic_handle_irq+0x58/0x60) from
> [<c04f26e4>] (__irq_svc+0x44/0x60)
> [    2.280670] Exception stack(0xdc869f88 to 0xdc869fd0)
> [    2.285949] 9f80:                   c07a87a0 c0022a40 00000000
> 00000000 dc868000 c07c8d08
> [    2.294525] 9fa0: c04fe078 c0743d70 00000000 410fc0f0 c0743fa0
> 00000000 00000000 dc869fd0
>
>
> The device tree data for acquiring the above GPIO interrupt line looks
> like this.
>
> +++ linux-omap-storage/arch/arm/boot/dts/omap5-evm.dts  2012-07-30
> 14:11:08.931694001 +0530
> @@ -42,7 +42,8 @@
>         tsl2771@39 {
>                 compatible = "taos,tsl2771";
>                 reg = <0x39>;
> +                interrupt-parent = <&gpio5>;
> +                interrupts = <21>; /* gpio line 149 */
>         };
>  };
>
> Note: using "gpio_request_one" in the driver solves the issue.
> Is using this api in the driver required?
> Any pointer on the above crash?

Any user/client driver of GPIO is supposed to go through
gpio_request() API so that module clock
is enabled correctly. Overriding of APIs would put the power
management state machine in jeopardy.
--
Tarun

>
> ~Sourav
--
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