VIDCON0_CLKDIR
val |= VIDCON0_CLKVAL_F(ctx->clkdiv - 1) | VIDCON0_CLKDIR;
data &= ~(VIDCON0_CLKVAL_F_MASK | VIDCON0_CLKDIR);
data |= VIDCON0_CLKVAL_F(clkdiv-1) | VIDCON0_CLKDIR;
data &= ~VIDCON0_CLKDIR; /* 1:1 clock */