/**
* shadow_protect_win() - disable updating values from shadow registers at vsync
*
* @win: window to protect registers for
* @protect: 1 to protect (disable updates)
*/
static void shadow_protect_win(struct s3c_fb_win *win, bool protect)
{
struct s3c_fb *sfb = win->parent;
u32 reg;
if (protect) {
if (sfb->variant.has_prtcon) {
writel(PRTCON_PROTECT, sfb->regs + PRTCON);
} else if (sfb->variant.has_shadowcon) {
reg = readl(sfb->regs + SHADOWCON);
writel(reg | SHADOWCON_WINx_PROTECT(win->index),
sfb->regs + SHADOWCON);
}
} else {
if (sfb->variant.has_prtcon) {
writel(0, sfb->regs + PRTCON);
} else if (sfb->variant.has_shadowcon) {
reg = readl(sfb->regs + SHADOWCON);
writel(reg & ~SHADOWCON_WINx_PROTECT(win->index),
sfb->regs + SHADOWCON);
}
}
}
/* prohibit shadow update during writing something to SFR */
void decon_reg_shadow_protect_win(u32 idx, u32 protect)
{
u32 val = protect ? ~0 : 0;
decon_write_mask(SHADOWCON, val, SHADOWCON_WINx_PROTECT(idx));
}