2 files changed, 10 insertions, 0 deletions

diff --git a/drivers/gpu/drm/i915/i915_dma.c b/drivers/gpu/drm/i915/i915_dma.c
index f4231185ec7d..d4c176b7d76e 100644
--- a/drivers/gpu/drm/i915/i915_dma.c
+++ b/drivers/gpu/drm/i915/i915_dma.c
@@ -1488,6 +1488,14 @@ int i915_driver_load(struct drm_device *dev, unsigned long flags)
 
         i915_dump_device_info(dev_priv);
 
+        /* Not all pre-production machines fall into this category, only the
+         * very first ones. Almost everything should work, except for maybe
+         * suspend/resume. And we don't implement workarounds that affect only
+         * pre-production machines. */
+        if (IS_HSW_EARLY_SDV(dev))
+                DRM_INFO("This is an early pre-production Haswell machine. "
+                         "It may not be fully functional.\n");
+
         if (i915_get_bridge_dev(dev)) {
                 ret = -EIO;
                 goto free_priv;
diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index 6d07467d0e7e..2e7d5f9524f7 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -1511,6 +1511,8 @@ struct drm_i915_file_private {
 #define IS_VALLEYVIEW(dev)      (INTEL_INFO(dev)->is_valleyview)
 #define IS_HASWELL(dev) (INTEL_INFO(dev)->is_haswell)
 #define IS_MOBILE(dev)          (INTEL_INFO(dev)->is_mobile)
+#define IS_HSW_EARLY_SDV(dev)   (IS_HASWELL(dev) && \
+                                 ((dev)->pci_device & 0xFF00) == 0x0C00)
 #define IS_ULT(dev)             (IS_HASWELL(dev) && \
                                  ((dev)->pci_device & 0xFF00) == 0x0A00)