PIPEDSL
position = I915_READ_FW(PIPEDSL(pipe)) & DSL_LINEMASK_GEN2;
position = I915_READ_FW(PIPEDSL(pipe)) & DSL_LINEMASK_GEN3;
temp = I915_READ_FW(PIPEDSL(pipe)) & DSL_LINEMASK_GEN3;
pipe_dsl_reg = PIPEDSL(pipe);
i915_reg_t reg = PIPEDSL(pipe);
i915_reg_t dslreg = PIPEDSL(pipe);