]> git.sur5r.net Git - u-boot/commit
drivers/video/am335x-fb: Add possibility to wait for stable power/picture
authorHannes Petermaier <oe5hpm@oevsv.at>
Tue, 3 Feb 2015 12:22:23 +0000 (13:22 +0100)
committerTom Rini <trini@konsulko.com>
Fri, 6 Mar 2015 01:13:16 +0000 (20:13 -0500)
commit3b4e16eb530aa3eaa29535a7d511c105c0de963a
tree1e6145c729a8742b0162cb6c4a0c84b67500c5d9
parent5822f5ae7f4112b4969145d28842cde38c58a20b
drivers/video/am335x-fb: Add possibility to wait for stable power/picture

Often on boards exists a circuit which switches power on/off to LCD display.
Due to the need of limiting the in-rush current the output voltage from this
circuit rises "slowly", so it is necessary to wait a bit (VCC ramp up time)
before starting output on LCD-pins.
This time is specified in <n> ms within the panel-settings, called "pup_delay"

Further some LCDs need a couple of frames to stabilize the image on it.
We have now the possibility to wait some time after starting output on LCD.
This time is also specified in <n> ms within panel-settings, called "pon_delay"

Signed-off-by: Hannes Petermaier <oe5hpm@oevsv.at>
drivers/video/am335x-fb.c
drivers/video/am335x-fb.h