Re: mx2_camera driver on mx27ipcam: dma_alloc_coherent size failed

["Jan Pohanka" <xhpohanka@xxxxxxxxx>]

Hi Uwe,

thank you for answer. You are right I give no memory to camera device in  
mach-imx27ipcam.c. I have tried to do it in same way as it is in  
mach-pcm037.c but no success. Here is my init function

static int __init mx27ipcam_camera_init(void) {
	int dma, ret = -ENOMEM;
	struct platform_device *pdev;

	printk("MX2 camera initialization.\n");

	pdev = imx27_add_mx2_camera(&mx27ipcam_camera);

	if (IS_ERR(pdev)) {
		printk("pdev error\n");
		return PTR_ERR(pdev);
	}

	dma = dma_declare_coherent_memory(&pdev->dev,
					mx2_camera_base, mx2_camera_base,
					MX2_CAMERA_BUF_SIZE,
					DMA_MEMORY_MAP | DMA_MEMORY_EXCLUSIVE);
	if (!(dma & DMA_MEMORY_MAP))
		goto err;


	ret = platform_device_add(pdev);
	if (ret) {
		printk("platform_device_add error\n");

err:
		platform_device_put(pdev);
	}

	return ret;
}


I do not understand fully this business around allocation so it may be  
wrong.

regards
Jan

Dne Fri, 29 Jul 2011 09:51:43 +0200 Uwe Kleine-König  
<u.kleine-koenig@xxxxxxxxxxxxxx> napsal(a):

> Hello,
>
> On Fri, Jul 29, 2011 at 09:31:28AM +0200, Jan Pohanka wrote:
> > I'm playing with imx27ipcam reference design and I would like to use
> > more recent (or actual) kernel than the one in BSP (2.6.19). I had
> > no problems with running 2.6.39 version from mainline, and now I
> > want to get some signal from CMOS chip. As there is no driver for
> > mt9d131 yet I modified the mt9m111 driver to communicate wit it.
> > Driver gets correctly initialized
> >
> > mx2-camera mx2-camera.0: initialising
> > mx2-camera mx2-camera.0: Camera clock frequency: 6250000
> > mx2-camera mx2-camera.0: Using EMMA
> > camera 0-0: Probing 0-0
> > mx27ipcam_camera_power: 1
> > mx27ipcam_camera_reset
> > mx2-camera mx2-camera.0: Camera driver attached to camera 0
> > mt9m111 0-0048: read  reg.000 -> 1519
> > mt9m111 0-0048: Detected a MT9D131 chip ID 1519
> > camera 0-0: Found 8 supported formats.
> > mx2-camera mx2-camera.0: Camera driver detached from camera 0
> > mx27ipcam_camera_power: 0
> > mx2-camera mx2-camera.0: MX2 Camera (CSI) driver probed, clock
> > frequency: 6250000
> >
> > For example this command should capture several frames
> > ffmpeg -s qvga -r 30 -t 2 -pix_fmt yuyv422 -f video4linux2 -i
> > /dev/video0 temp_vid.h263
> >
> > however there is some problems with dma_contig allocation
> > mx2-camera mx2-camera.0: dma_alloc_coherent size 155648 failed
> > [video4linux2 @ 0xfa8c50]mmap: Cannot allocate memory
> > /dev/video0: Input/output error
> >
> > ...
> > camera 0-0: mmap called, vma=0xc397fd30
> > camera 0-0: vma start=0x4014c000, size=155648, ret=0
> > camera 0-0: mmap called, vma=0xc397fcd8
> > camera 0-0: vma start=0x40ee8000, size=155648, ret=0
> > camera 0-0: mmap called, vma=0xc397fc80
> > camera 0-0: vma start=0x40fa4000, size=155648, ret=0
> > camera 0-0: mmap called, vma=0xc397fc28
> > camera 0-0: vma start=0x4109a000, size=155648, ret=0
> > camera 0-0: mmap called, vma=0xc397fbd0
> > camera 0-0: vma start=0x41124000, size=155648, ret=0
> > camera 0-0: mmap called, vma=0xc397fb78
> > camera 0-0: vma start=0x4118a000, size=155648, ret=0
> > camera 0-0: mmap called, vma=0xc397fb20
> > camera 0-0: vma start=0x41241000, size=155648, ret=0
> > camera 0-0: mmap called, vma=0xc397fac8
> > camera 0-0: vma start=0x41277000, size=155648, ret=0
> > camera 0-0: mmap called, vma=0xc397fa70
> > camera 0-0: vma start=0x412c3000, size=155648, ret=0
> > camera 0-0: mmap called, vma=0xc397fa18
> > camera 0-0: vma start=0x41377000, size=155648, ret=0
> > camera 0-0: mmap called, vma=0xc397f9c0
> > camera 0-0: vma start=0x41416000, size=155648, ret=0
> > camera 0-0: mmap called, vma=0xc397f968
> > camera 0-0: vma start=0x4147f000, size=155648, ret=0
> > camera 0-0: mmap called, vma=0xc397f910
> > camera 0-0: vma start=0x414a5000, size=155648, ret=0
> > camera 0-0: mmap called, vma=0xc397f8b8
> > camera 0-0: vma start=0x41542000, size=155648, ret=0
> > camera 0-0: mmap called, vma=0xc397f860
> > camera 0-0: vma start=0x415ba000, size=155648, ret=0
> > camera 0-0: mmap called, vma=0xc397f808
> > mx2-camera mx2-camera.0: dma_alloc_coherent size 155648 failed
> > camera 0-0: vma start=0x41667000, size=155648, ret=-12
> > mx2-camera mx2-camera.0: Camera driver detached from camera 0
> > mx27ipcam_camera_power: 0
> > camera 0-0: camera device close
> Check out what arch/arm/mach-imx/mach-pcm037.c does to give some memory
> to the camera device.
>
> Best regards
> Uwe


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