drm/i915: Add I915_PARAM_REVISION

Adds a parameter which can be used with DRM_I915_GETPARAM to query the
GPU revision. The intention is to use this in Mesa to implement the
WaDisableSIMD16On3SrcInstr workaround on Skylake but only for
revision 2.

Signed-off-by: Neil Roberts <neil@linux.intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

1 files changed, 3 insertions, 0 deletions

diff --git a/drivers/gpu/drm/i915/i915_dma.c b/drivers/gpu/drm/i915/i915_dma.c
index 053e1788f578..3b64c526b6b9 100644
--- a/drivers/gpu/drm/i915/i915_dma.c
+++ b/drivers/gpu/drm/i915/i915_dma.c
@@ -68,6 +68,9 @@ static int i915_getparam(struct drm_device *dev, void *data,
         case I915_PARAM_CHIPSET_ID:
                 value = dev->pdev->device;
                 break;
+        case I915_PARAM_REVISION:
+                value = dev->pdev->revision;
+                break;
         case I915_PARAM_HAS_GEM:
                 value = 1;
                 break;