HDMI_MC_CLKDIS
clkdis = RD1(sc, HDMI_MC_CLKDIS) & HDMI_MC_CLKDIS_CECCLK_DISABLE;
WR1(sc, HDMI_MC_CLKDIS, clkdis);
WR1(sc, HDMI_MC_CLKDIS, clkdis);
val = RD1(sc, HDMI_MC_CLKDIS);
WR1(sc, HDMI_MC_CLKDIS, val);