DBUF_POWER_STATE
if (I915_READ(DBUF_CTL_S2) & DBUF_POWER_STATE)
status = I915_READ(reg) & DBUF_POWER_STATE;
if (!(I915_READ(DBUF_CTL_S1) & DBUF_POWER_STATE) ||
!(I915_READ(DBUF_CTL_S2) & DBUF_POWER_STATE))
if ((I915_READ(DBUF_CTL_S1) & DBUF_POWER_STATE) ||
(I915_READ(DBUF_CTL_S2) & DBUF_POWER_STATE))
WARN((tmp & (DBUF_POWER_STATE | DBUF_POWER_REQUEST)) !=
(DBUF_POWER_STATE | DBUF_POWER_REQUEST),