About supported resolution of the HDMI for i.MX6

[yuuki]

Dear all

Does the HDMI of i.MX6 support 1280x800 resolution?
If yes, would you tell me the available following parameter?

   ・Horizontal frequency
   ・Vertical resolution
   ・H back porch
   ・Hsync width
   ・V back porch
   ・Vsync width

We confirmed EDID of the HDMI by a cat command.
However, the 1280x800 resolution is not included.
We are concerned about 1280x800 not being supported.

root@imx6qpsabresd:~# cat /sys/class/graphics/fb0/modes
U:640x480p-59
U:1280x720p-120
U:1280x720p-100
U:1920x1080p-30
U:1920x1080p-25
U:1920x1080p-24
U:1920x1080p-50
U:1440x576p-50
U:1440x576p-50
U:1440x288p-50
U:1440x288p-50
U:1280x720p-50
U:720x576p-50
U:720x576p-50
U:1920x1080p-60
U:1440x480p-60
U:1440x480p-60
U:1440x240p-60
U:1440x240p-60
U:1280x720p-60
U:720x480p-60
U:720x480p-60
U:640x480p-60

Best Regards,
Yuuki

[joanxie]

try to use the command like below:

echo U:1280x800p-60 >/sys/class/graphics/fbx/mode, fbx depends what fb you use

[yuuki]

joanxie‌

Dear Joan-san,

Thank you for your response.

I tried the command. However, Write error occurs.

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root@imx6qpsabresd:~# echo U:1280x800p-60 > /sys/class/graphics/fb0/mode
-sh: echo: write error: Invalid argument

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I tried the following resolution for trial. The existing resolution seems to run well.

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root@imx6qpsabresd:~# echo "U:1280x720p-60" > /sys/class/graphics/fb0/mode
imx-ipuv3 2400000.ipu: IPU DMFC DP HIGH RESOLUTION: 1(0,1), 5B(2~5), 5F(6,7)

============================================================

I executed the following command.

/usr/sbin/fbset -fb /dev/fb0 -a -g 1280 800 1280 800 32 -t 11976 72 200 3 22 128 6

It seems to be able to output WXGA correctly.

However, sound sampling frequency does not seem to be set correctly from dotoclock.

It seems to be necessary to add a modification to driver\mfd\mxc-hdmi-core.c.

May I have advice?