Re: mx2_camera driver on mx27ipcam: dma_alloc_coherent size failed

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Hello Uwe,
thank you for the hint. There was problem with insufficient memory.
dma_alloc_from_coherent is called several times and when I allocated
only 4MB, last call failed. When I passed 8MB to
dma_declare_coherent_memory, it works. Unfortunately I do not
understand why 4MB is not enough for 640x480 YUV image...

regards
Jan

2011/8/4 Uwe Kleine-König <u.kleine-koenig@xxxxxxxxxxxxxx>:
> Hello Jan,
>
> On Thu, Aug 04, 2011 at 03:11:11PM +0200, Jan Pohanka wrote:
>> Dear Uwe,
>> could you please give me some advice once more? It seems I'm not
>> able to make mx2_camera working by myself.
>> I have tried dma memory allocation in my board file in several ways,
>> but nothing seems to work. I use Video capture example for v4l2 for
>> testing.
>>
>> regards
>> Jan
>>
>> mx27ipcam_camera_power: 1
>> mx27ipcam_camera_reset
>> mx2-camera mx2-camera.0: Camera driver attached to camera 0
>> mx2-camera mx2-camera.0: dma_alloc_coherent size 614400 failed
>> mmap error 12, Cannot allocate memory
>> mx2-camera mx2-camera.0: Camera driver detached from camera 0
>> mx27ipcam_camera_power: 0
> Cannot say offhand. I'd instrument dma_alloc_from_coherent to check
> where it fails.
>
> The patch looks OK from a first glance.
>
> Best regards
> Uwe
>
> --
> Pengutronix e.K.                           | Uwe Kleine-König            |
> Industrial Linux Solutions                 | http://www.pengutronix.de/  |
>
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