drivers/video/backlight/l4f00242t03.c: fix reset sequence
authorAlberto Panizzo <maramaopercheseimorto@gmail.com>
Thu, 13 Jan 2011 00:59:24 +0000 (16:59 -0800)
committerLinus Torvalds <torvalds@linux-foundation.org>
Thu, 13 Jan 2011 16:03:06 +0000 (08:03 -0800)
commitaff5ce6ca8d25c7dbcd886e2e51dd081981af95e
tree789fdb378dac5ac1b71dadf87d222c0a487b9b6a
parent26bbabc8e80b4b9e42aca13376a2c1609a880e21
drivers/video/backlight/l4f00242t03.c: fix reset sequence

The reset command is part of the init sequence and it take effect
only if the lcd is powered.

The effect of the bug was that the sequence:
set lcd power_state to FB_BLANK_POWERDOWN
set lcd power_state to FB_BLANK_UNBLANK
Did not produced a complete reboot of the LCD which was showing fuzzy
colours.

This was not experienced before implementing correctly all the LCD power
states with the patch [1].  Since before the patch [1] the regulators were
not touched and the LCD shutdown was reached with a register write.  After
the patch [1] a complete boot sequence with an initial reset is needed for
the display every time the LCD is powered up.

drivers-video-backlight-l4f00242t03c-full-implement-fb-power-states-for-this-lcd.patch

Signed-off-by: Alberto Panizzo <maramaopercheseimorto@gmail.com>
Cc: Richard Purdie <rpurdie@rpsys.net>
Cc: Marek Vasut <marek.vasut@gmail.com>
Cc: Tejun Heo <tj@kernel.org>
Cc: Axel Lin <axel.lin@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
drivers/video/backlight/l4f00242t03.c