SUN4I_HDMI_PAD_CTRL1_HALVE_CLK
val &= SUN4I_HDMI_PAD_CTRL1_HALVE_CLK;
if (reg & SUN4I_HDMI_PAD_CTRL1_HALVE_CLK)
reg &= ~SUN4I_HDMI_PAD_CTRL1_HALVE_CLK;
reg |= SUN4I_HDMI_PAD_CTRL1_HALVE_CLK;