VLV_PCBR
s->pcbr = I915_READ(VLV_PCBR);
I915_WRITE(VLV_PCBR, s->pcbr);
unsigned long pctx_addr = I915_READ(VLV_PCBR) & ~4095;
unsigned long pctx_addr = I915_READ(VLV_PCBR) & ~4095;
pcbr = I915_READ(VLV_PCBR);
I915_WRITE(VLV_PCBR, pctx_paddr);
DRM_DEBUG_DRIVER("PCBR: 0x%08x\n", I915_READ(VLV_PCBR));
pcbr = I915_READ(VLV_PCBR);
I915_WRITE(VLV_PCBR, pctx_paddr);
DRM_DEBUG_DRIVER("PCBR: 0x%08x\n", I915_READ(VLV_PCBR));
pcbr = I915_READ(VLV_PCBR);