If we blank the panel by
echo 1 > /sys/devices/platform/omapfb/graphics/fb0/blank

Then, we reboot the sytem, the kernel will crash at
drivers/video/omap2/dss/core.c:323

This is because the panel is closed twice. Now check the state of a dssdev
to forbid a panel is power on or power off twice.
Signed-off-by: NStanley.Miao <stanley.miao@windriver.com>
Signed-off-by: NTomi Valkeinen <tomi.valkeinen@nokia.com>

Tested on OMAP3EVM for OMAP3530 and AM/DM 3730.
Signed-off-by: NVaibhav Hiremath <hvaibhav@ti.com>
[tomi.valkeinen@nokia.com: added slab.h include]
[tomi.valkeinen@nokia.com: added dependency to BACKLIGHT_CLASS_DEVICE]
Signed-off-by: NTomi Valkeinen <tomi.valkeinen@nokia.com>

Move enable/disable/suspend/resume from omap_dss_device to
omap_dss_driver.

This is part of a larger patch-set, which moves the control from omapdss
driver to the display driver.
Signed-off-by: NTomi Valkeinen <tomi.valkeinen@nokia.com>

The regulator is now enabled by DSS driver, and thus the panel driver
doesn't need to touch it.
Signed-off-by: NTomi Valkeinen <tomi.valkeinen@nokia.com>

Add Generic panel (user for DVI output) and Sharp LS037V7DW01 LCD panel.
Signed-off-by: NTomi Valkeinen <tomi.valkeinen@nokia.com>