Re: [PATCH v8 0/3] add the GPMI controller driver for IMX23/IMX28

[Huang Shijie <b32955@freescale.com>]

Hi,
> Hi,
>
> Don't think it's a hardware issue. After all it is working on the
> mx23evk using the Freescale BSP based on 2.6.35.3.
I doubt the Freescale BSP has fix the conflict, while the community 
kernel does not
fix it.
Anyway, I will do more test on the mx23 board myself.



> Now I tested using this kernel command line:
> mtdparts=gpmi-nand:20m(boot),-(user) gpmi_debug_init
> (So I removed the ubi rootfs stuff, see previous mails).
>
> Its booting fine now without complaining about dma timeouts.
ok.
> Have tried flash_eraseall /dev/mtd1. Now it's complaining and thinking
> all blocks are bad. So a "flash_erase: Skipping bad block at 1db00000"
> message for every erase block.
> Writing 1 to /sys/devices/platform/imx23-gpmi-nand/ignorebad, makes to
This is a very dangerous interface.

> go a little further giving 'only one' error but I doubt it's working
> at all. See attached log file.
>
> When the trying ubiformat /dev/mtd1 its stopping with a dma timeout.
echo 0x20 > /sys/devices/platform/imx23-gpmi-nand/gpmi_debug

to show the GPMI register when the DMA timeout occurs.


Best Regards
Huang Shijie
> Every subsequent action (e.g. using ubiformat or flash_eraseall) using
> that dma channel is failing.
> I have put a printk in mxs-dma.c around line 387:
>
>      if (mxs_chan->status == DMA_IN_PROGRESS&&  !append)
>      {
>          pr_err("dma already in progess!\n");
>          return NULL;
>      }
>
> I see that printk also in the log file in attach. Seems like the
> mxs-dma is failing at some point and for the rest of the time always
> keeps it's status at DMA_IN_PROGRESS
>
> Any input or feedback is welcome.
>
> Regards,
> Koen
>
>
> On Sun, Jul 31, 2011 at 3:51 PM, Marek Vasut<marek.vasut@gmail.com>  wrote:
>> On Friday, July 29, 2011 05:00:48 PM Koen Beel wrote:
>>> On Fri, Jul 29, 2011 at 2:41 PM, Lothar Waßmann<LW@karo-electronics.de>
>> wrote:
>>>> Hi,
>>>>
>>>> Koen Beel writes:
>>>>> Hi,
>>>>>
>>>>> On Fri, Jul 29, 2011 at 9:20 AM, Lothar Waßmann<LW@karo-electronics.de>
>> wrote:
>>>>>> Hi,
>>>>>>
>>>>>> Koen Beel writes:
>>>>>>> Hi,
>>>>>>>
>>>>>>> I have test on mx23evk board. Still see the same issues.
>>>>>>>
>>>>>>> On Wed, Jul 27, 2011 at 3:53 AM, Huang Shijie<b32955@freescale.com>
>> wrote:
>>>>>>>> Hi,
>>>>>>>>
>>>>>>>> Thanks for your test.
>>>>>>>>
>>>>>>>>> Hi,
>>>>>>>>>
>>>>>>>>> It's not really working for me.
>>>>>>>>> I've applied all gpmi-nand driver patches and the dma driver
>>>>>>>>> patches.
>>>>>>>>>
>>>>>>>>> I have added following kernel parameters:
>>>>>>>>> mtdparts=gpmi-nand:20m(boot),-(user) ubi.mtd=1 root=ubi0:rootfs0
>>>>>>>>> rootfstype=ubifs gpmi_debug_init
>>>>>>>>>
>>>>>>>>> During boot I get already get DMA timeout:
>>>>>>>>> [    2.560000] [ start_dma_without_bch_irq : 392 ] DMA timeout,
>>>>>>>>> last DMA
>>>>>>>>>
>>>>>>>>> :1
>>>>>>>>>
>>>>>>>>> [    3.560000] [ start_dma_with_bch_irq : 427 ] bch timeout!!!
>>>>>>>>> ...
>>>>>>>>> (see log file in attach line 89)
>>>>>>> I still see this DMA timeout when booting.
>>>>>>> What kernel parameters do you use? I still use same as above.
>>>>>> Do you have an SD card in the system? I'm getting the same error when
>>>>>> accessing an SD card. Without SD card I can use the flash without any
>>>>>> errors.
>>>>> No SD card in the system. At least not on my mx23evk board.
>>>>> My real target hardware has a SDIO wifi chip.
>>>>>
>>>>> Are you also testing on the mx23evk board? Really strange it is not
>>>>> reproducible here then.
>>>>> Anyone using mx23evk please give:
>>>>> - revision number of board (I have tested on rev C1)
>>>>> - kernel parameter used (see previous mail for mine)
>>>> It's getting ever more strange. I only have problems with concurrent
>>>> access to the flash and SD-card when I do file system based accessed
>>>> to the SD card.
>>>> A 'dd if=/dev/mmcblk0 of=/dev/null' while excessively using the flash
>>>> works well, while mounting the SD card and doing an 'ls' produces
>>>> immediate BCH DMA timeouts.
>>>>
>>>> Perhaps someone can make anything out of that.
>>> I have checked and the function dma_irq_callback is never called
>>> during my tests. This means the DMA transfer does not even works once.
>>>
>>> Also no clue here ...
>> Aren't you getting some undervolt on the powerrail for example ? btw the driver
>> looks a bit crappy to me, but let's believe it works ;-)
>>
>>>> Lothar Waßmann
>>>> --
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>>>>
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