LCSR
lcd_writel(fbi, LCSR, 0xffffffff);
lcsr = lcd_readl(fbi, LCSR);
lcd_writel(fbi, LCSR, lcsr);
writel_relaxed(~0, fbi->base + LCSR);
unsigned int lcsr = readl_relaxed(fbi->base + LCSR);
writel_relaxed(lcsr, fbi->base + LCSR);