[meta-freescale] Video overlay on sabresd

[Nikolay Dimitrov]

Hi all,

On 05/20/2015 08:41 PM, Nikolay Dimitrov wrote:
> Hi Prabhu,
>
> On 05/19/2015 07:22 PM, Prabhu S wrote:
>> How about this?
>> /unit_tests/mxc_v4l2_output.out -iw 1024 -ih 768 -ow 1024 -oh 768 -d
>> /dev/video17 -fr 30 -l 10 -f YUYV ./your-file.yuyv
>>
>> /dev/video17 is for overlay
>>
>> On Tue, May 19, 2015 at 11:16 AM, Nikolay Dimitrov <picmaster at mail.bg
>> <mailto:picmaster at mail.bg>> wrote:
>>
>>     Hi guys,
>>
>>     I'm trying to get the video overlay working on imx6q sabresd's HDMI.
>>     Here's the kernel command line:
>>
>>     console=ttymxc0,115200 root=/dev/mmcblk2p2 rootwait rw
>>     video=mxcfb0:dev=hdmi,1280x720M at 60,if=RGB2
>>     4,bpp=32 fbmem=28M
>>
>>     This is the kernel version:
>>
>>     # uname -a
>>     Linux imx6qsabresd 3.14.28-1.0.0_ga+g91cf351 #1 SMP PREEMPT Tue May
>>     19 17:32:51 EEST 2015 armv7l
>>     GNU/Linux
>>
>>     Here are the framebuffer devices nodes:
>>
>>     # ls -lh /dev/fb*
>>     crw-rw----    1 root     video      29,   0 Jan  1  1970 /dev/fb0
>>     crw-rw----    1 root     video      29,   1 Jan  1  1970 /dev/fb1
>>     crw-rw----    1 root     video      29,   2 Jan  1  1970 /dev/fb2
>>     crw-rw----    1 root     video      29,   3 Jan  1  1970 /dev/fb3
>>
>>     I can write arbitrary data on /dev/fb0 and see it on screen, like
>> this:
>>
>>     # cat /bin/busybox.nosuid > /dev/fb0
>>
>>     But I can't write to /dev/fb1:
>>
>>     # cat /bin/busybox.nosuid > /dev/fb1
>>     cat: write error: No space left on device
>>
>>     I'm assuming that fb0 is the background layer, and fb1 is the
>>     foreground IPU layer.
>>
>>     So the question is - how to make the foreground (fb1) layer
>> working at
>>     all? Should I configure mxcfb1 in the bootargs, or it needs some
>> IOCTL
>>     in /dev/fb1 to enable the device?
>
> Thanks for sharing. This works, but I'm trying to achieve exactly the
> opposite.
>
> I need to have my UI on the FG layer (which imho means X rendering to
> /dev/fb1), and my video player must render on BG layer (/dev/video16,
> which imho corresponds to /dev/fb0).
>
> At the moment I can't seem to be able to draw anything on /dev/fb1, so
> I doubt that Xorg will also run properly on it.

I've reordered the video interfaces in the DT, and also in the kernel
cmdline, to make sure the hdmi is the first and only video interface,
so hopefully the IPU driver will create both BG and FG channels for it.

Unfortunately I still can't write to /dev/fb1, so I'm digging further.

Regards,
Nikolay