Linux/AM5728: Dual camera demo and CMEM

xiaoyan Chi

Expert 1395 points

Part Number: AM5728

Tool/software: Linux

Hi,

I recompile the dual-camera-demo in topdir of sdk4.2.0.9 with :make dual-camera-demo

I changed the "default_parameters" in loopback.c to our own device:

/* Main camera */
cap0_device.memory_mode = V4L2_MEMORY_DMABUF;
cap0_device.num_buffers = NBUF;
strcpy(cap0_device.dev_name,"/dev/video2");
strcpy(cap0_device.name,"Capture 0");
cap0_device.buffers = NULL;
cap0_device.fmt.fmt.pix.pixelformat = V4L2_PIX_FMT_YUYV;
cap0_device.width = 1920;
cap0_device.height = 1080;

And I uncomment "#define USE_CMEM_BUF" to capture frames to .jpeg .

It display fine.But when I tried to click Capture the app will be crash:

root@am57xx-evm:/opt# ./dual_camera -platform linuxfb
CRTCs size: 1920x1080

Capture 0: Opened Channel

Capture 0: Capable of streaming

Capture 0: Init done successfully

allocating cmem buffer of size 0x3f4800
allocating cmem buffer of size 0x3f4800

Capture 1: Opened Channel

Capture 1: Capable of streaming

VIDIOC_G_PARM: Inappropriate ioctl for device
allocating cmem buffer of size 0x3f4800Only one camera detected
Running the demo on am57xx processor
w=1920, h=1080
//click "Capture " here
Segmentation fault (core dumped)

There is a image0.jpg in /usr/share/camera-images/ ,but nothing can be stored.

And I tried to read the buf from the cmem pointer "buf->cmem".There is still nothing in cmem.

We are anxious to use cmem to read picture from V4L2 quickly and then display the proccessed picture.

But we can't read the picture in this demo.Please help us.

Best Regards.

over 7 years ago

0 xiaoyan Chi over 7 years ago

Expert 1395 points

Hi,
I found that issue occur at "alloc_cmem_buffer" in cmem_buf.c
When excute :
CMEM_export_dmabuf(cmem_buf);
"cmem_buf" will be return to 0 .Why did that happened?
the fuction:
cmem_buf = CMEM_alloc2(CMEM_BLOCKID, size,&cmem_alloc_params);
has already alloc a cmem_buf which I have checked.

0 xiaoyan Chi over 7 years ago in reply to xiaoyan Chi

Expert 1395 points

int alloc_cmem_buffer(unsigned int size, unsigned int align, void *cmem_buf)
{
cmem_alloc_params.alignment = align;

printf("\n allocating cmem buffer of size 0x%x", size);

cmem_buf = CMEM_alloc2(CMEM_BLOCKID, size,
&cmem_alloc_params);

if(cmem_buf == NULL){
printf("CMEM allocation failed");
return -1;
}

return CMEM_export_dmabuf(cmem_buf); //cmem return to 0 ???
}

0 Manisha Agrawal over 7 years ago in reply to xiaoyan Chi

TI__Mastermind 22946 points

Hi, There is known bug in dual_camera_demo cmem buffer allocation which will be taken care in next Processor SDK release. The alloc_cmem_buffer() function call needs to pass pointer to the buffer address and inside that function, the value needs to be stored as *cmem_buf.

buf->fd[0] = alloc_cmem_buffer(w*h*bytes_pp, 1, &buf->cmem_buf);

*cmem_buf = CMEM_alloc2(CMEM_BLOCKID, size, &cmem_alloc_params);

0 xiaoyan Chi over 7 years ago in reply to Manisha Agrawal

Expert 1395 points

Hi,
Thanks,and another advice of alloc_cmem_buffer() "void *cmem_buf" need to be "unsigned int *cmem_buf"

0 Manisha Agrawal over 7 years ago in reply to xiaoyan Chi

TI__Mastermind 22946 points

CMEM_alloc2() API returns void *, so it's okay to return back as void * that application can assign to the type they want to consume the buffer as.

0 xiaoyan Chi over 7 years ago in reply to Manisha Agrawal

Expert 1395 points

Hi,

Thanks for your reply.

There is another issue happened.

I tried to creat a new cmem block in am57xx-evm-cmem.dtsi

/ {
reserved-memory {
#address-cells = <2>;
#size-cells = <2>;
ranges;

cmem_block_mem_0: cmem_block_mem@a0000000 {
reg = <0x0 0xa0000000 0x0 0xc000000>;
no-map;
status = "okay";
};

cmem_block_mem_1_ocmc3: cmem_block_mem@40500000 {
reg = <0x0 0x40500000 0x0 0x100000>;
no-map;
status = "okay";
};

cmem_block_mem_2: cmem_block_mem@ac000000 {
reg = <0x0 0xac000000 0x0 0xc000000>;
no-map;
status = "okay";
};

};

cmem {
compatible = "ti,cmem";
#address-cells = <1>;
#size-cells = <0>;

#pool-size-cells = <2>;

status = "okay";

cmem_block_0: cmem_block@0 {
reg = <0>;
memory-region = <&cmem_block_mem_0>;
cmem-buf-pools = <1 0x0 0xc000000>;
};

cmem_block_1: cmem_block@1 {
reg = <1>;
memory-region = <&cmem_block_mem_1_ocmc3>;
};

cmem_block_2: cmem_block@2 {
reg = <2>;
memory-region = <&cmem_block_mem_2>;
cmem-buf-pools = <1 0x0 0xc000000>;
};

};
};

0xac000000 ~ 0xb7ffffff is my cmem to store buffer

But when I tried to update the am57xx-beagle-x15.dtb :

root@am57xx-evm:/opt# cat /proc/cmem

Block 0: Pool 0: 1 bufs size 0xc000000 (0xc000000 requested)

Pool 0 busy bufs:

Pool 0 free bufs:
id 0: phys addr 0xa0000000

root@am57xx-evm:~# cat /proc/iomem | grep CMEM
40500000-405fffff : CMEM
a0000000-abffffff : CMEM
ac000000-b7ffffff : CMEM

still one default block?

0 boycchi over 7 years ago in reply to xiaoyan Chi

Expert 1005 points

Hi,

Do u solve this cmem issue?I am facing the same issue,did that work to create a new block in am57xx-evm-cmem.dtsi?

Any insight on this will be nice.

Thanks and BR

0 xiaoyan Chi over 7 years ago in reply to boycchi

Expert 1395 points

Hi,

I've solved it.

If you use:

CMEM_AllocParams cmem_alloc_params = {

CMEM_HEAP, /* type */

CMEM_CACHED, /* flags */

1 /* alignment */

};

cmem_buf = CMEM_alloc2(CMEM_BLOCKID, size,

&cmem_alloc_params);

You will got a cmem in ddr automatically.

If you set CMEM_POOL.

You can choose a blockid in CMEM_alloc2()

0 boycchi over 7 years ago in reply to xiaoyan Chi

Expert 1005 points

Hi,
Thanks for your reply.I have created a new block in am57xx-evm-cmem.dtsi,but when I run the dual_cam demo,the allocation still failed.Could u tell me how to set CMEM_POOL?Is there other change should i make in dts file or the demo?

CMEM Error: allocHeap: ioctl CMEM_IOCALLOCHEAPCACHED failed: -1
allocating cmem buffer of size 0x3f4800CMEM allocation failed
CMEM Error: free: failed to free 0
Cannot export CMEM buffer
ERROR:get_vid_buffers_new:400: allocation failed

0 xiaoyan Chi over 7 years ago in reply to boycchi

Expert 1395 points

Hi,
Below is my old thread about cmem:
e2e.ti.com/.../660967
Maybe that will help you .

0 boycchi over 7 years ago in reply to xiaoyan Chi

Expert 1005 points

Hi,
Sorry to interrupt u again.I've checked your old thread and add a new block,now my question is how to choose this block in dual_cam demo,I found it used the old block not my new block.
root@am57xx-evm:~# cat /proc/cmem

Block 0: Pool 0: 1 bufs size 0xf000000 (0xf000000 requested)

Pool 0 busy bufs:

Pool 0 free bufs:
id 0: phys addr 0xa0000000

Block 1: Pool 0: 1 bufs size 0xf000000 (0xf000000 requested)

Pool 0 busy bufs:

Pool 0 free bufs:
id 0: phys addr 0xaf000000
Thanks sincerely and BR

0 boycchi over 7 years ago

Expert 1005 points

I've tried ti-mctd too,and the same issue come,how did u solve it?
root@am57xx-evm:~# ti-mctd
[ 2040.531084] CMEMK Error: ioctl: no heap available in block 1
CMEM Error: allocHeap: ioctl CMEM_IOCALLOCHEAPCACHED failed: -1
TIOCL FATAL: Unable to allocate On-chip CMEM from 0xaf000000

0 boycchi over 7 years ago

Expert 1005 points

Hi bulabula_yan,
Problem solved,thanks for your help!

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Linux/AM5728: Dual camera demo and CMEM