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Using 720p as Android's default none VGA TFTLCD resolution allows for
the default tablet mode layout to be run which makes most sense for
evaluation purpose on regular monitors.
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Due to a pin muxing conflict between the regular backlight PWM and the
camera we do have to make this code not CAMERA_INTERFACE define
dependant.
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Add the following tested (e.g. framebuffer console and X) video modes:
- 800x480@60 (e.g. for EDT ET070080DH6)
- 800x600@60
- 1024x768@60
- 1024x768@75
- 1280x720@70 aka 720p
- 1366x768@60
The define TEGRA_FB_VGA in board-colibri_t20.h can be used to switch
between VGA and 800x480.
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Fix PWM backlight by using PWM<A> rather than PWM<C> by default.
Invert brightness value due to unified TFT interface displays (e.g. EDT
ET070080DH6) inverted LEDCTRL pin behaviour (e.g. 0V brightest vs. 3.3V
darkest) and use PWM frequency of 1 kHz as recommended.
Add comment about PWM pin muxing.
While at it do some ifdef and indentation clean-up.
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Incorporate L4T R16 changes from NVIDIA Ventana.
Note: USB OTG port not functional as of yet.
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Default to VESA VGA resolution rather than 1366x768.
Remove come debug prints and comments while at it.
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