Re: panda board crash when detecting usb devices

[Belisko Marek <marek.belisko@gmail.com>]

On Mon, Jul 2, 2012 at 10:23 AM, Sascha Hauer <s.hauer@pengutronix.de> wrote:
> On Mon, Jul 02, 2012 at 12:53:06AM +0200, Belisko Marek wrote:
>> In current next there is issue with usb command on panda board:
>>
>> barebox@Texas Instrument's Panda:/ usb
>> USB: scanning bus for devices...
>> unable to handle NULL pointer dereference at address 0x00000004
>> pc : [<8f00ac10>]    lr : [<8f00a41c>]
>> sp : 8cfffde0  ip : 8d001ce8  fp : 00000000
>> r10: 00000000  r9 : 8cffff44  r8 : 8f033a34
>> r7 : 00100100  r6 : 00200200  r5 : 8d014160  r4 : 8d01416c
>> r3 : 00000000  r2 : 00000000  r1 : 00000000  r0 : 8d01416c
>> Flags: nzCv  IRQs off  FIQs off  Mode SVC_32
>> [<8f00ac10>] (ehci_init+0x1c/0x128) from [<8f00a41c>] (usb_rescan+0xa4/0xfc)
>> [<8f00a41c>] (usb_rescan+0xa4/0xfc) from [<8f01332c>] (do_usb+0x4c/0x64)
>> [<8f01332c>] (do_usb+0x4c/0x64) from [<8f0053e0>] (execute_command+0x38/0x7c)
>> [<8f0053e0>] (execute_command+0x38/0x7c) from [<8f001aac>]
>> (run_list_real+0x8b8/0x9b0)
>> [<8f001aac>] (run_list_real+0x8b8/0x9b0) from [<8f001cec>]
>> (parse_stream_outer+0x148/0x238)
>> [<8f001cec>] (parse_stream_outer+0x148/0x238) from [<8f002074>]
>> (run_shell+0x3c/0x7c)
>> [<8f002074>] (run_shell+0x3c/0x7c) from [<8f006a1c>] (start_barebox+0xd4/0x10c)
>> [<8f006a1c>] (start_barebox+0xd4/0x10c) from [<84081164>] (0x84081164)
>>
>> [<8f023898>] (unwind_backtrace+0x0/0xa8) from [<8f0144bc>] (panic+0x28/0x48)
>> [<8f0144bc>] (panic+0x28/0x48) from [<8f023e38>] (do_exception+0x10/0x14)
>> [<8f023e38>] (do_exception+0x10/0x14) from [<8f023ec4>]
>> (do_data_abort+0x2c/0x38)
>> [<8f023ec4>] (do_data_abort+0x2c/0x38) from [<8f023ad0>] (data_abort+0x50/0x60)
>>
>>
>> It is crashing in ehci_halt() in first ehci_read call. IMO ehci_read
>> access wrong memory (that is reason do data_abort?)
>> I have rev. A2. Any ideas?
>
> My bad, sorry. Try the following patch.
It's OK now. Seems it also in 2012.07. Thanks.
>
> Sascha
>
> 8<---------------------------------------------------------
>
> ehci: Fix resource size
>
> We now have a resource size for the ehci hccr register space. This
> was assumed to be 0x40 in size. On OMAP though it is only 0x10 and
> then the hccr resource conflicts with the hcor resource which results
> in a non working ehci port on beagle and panda boards. This patch
> adds a nonintrusive workaround, it limits the hccr resource to 0x10,
> which then also works on OMAP.
>
> Later we should drop the multiple resources for the ehci port and
> make the resource as specified in the datasheets.
>
> This is broken since:
>
> commit 08845e41fba2b16dd3050b6b910c615e1bb8e57c
> Author: Sascha Hauer <s.hauer@pengutronix.de>
> Date:   Wed May 23 12:54:24 2012 +0200
>
>     usb ehci: Add resource sizes
>
>     add_usb_ehci_device registers resources with size 0. Fix this.
>
>     Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
>
> Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
> ---
>  drivers/base/resource.c |    2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/base/resource.c b/drivers/base/resource.c
> index 347b2f0..9844d1a 100644
> --- a/drivers/base/resource.c
> +++ b/drivers/base/resource.c
> @@ -113,7 +113,7 @@ struct device_d *add_usb_ehci_device(int id, resource_size_t hccr,
>
>         res = xzalloc(sizeof(struct resource) * 2);
>         res[0].start = hccr;
> -       res[0].size = 0x40;
> +       res[0].size = 0x10;
>         res[0].flags = IORESOURCE_MEM;
>         res[1].start = hcor;
>         res[1].size = 0xc0;
> --
> 1.7.10
>
> --
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marek

-- 
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-------------------------------------------------
Marek Belisko - OPEN-NANDRA
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