video: s3c-fb: add shadow register protect

Shadow registers should be protectd whenever the registers are
updated. Shadow registers are updated after SHADOWCON shadow
register is cleared.

Signed-off-by: Jingoo Han <jg1.han@samsung.com>
Signed-off-by: Florian Tobias Schandinat <FlorianSchandinat@gmx.de>
1 file changed