drm/i915: rip out gen2 reset code

At least on my i830M here it reliably results in hard system hangs
nowadays. This is much worse than falling back to software rendering,
so I think we should simply rip this out.

After all we don't have any gpu reset for gen3 either, and there are a
lot more of those still around.

Cc: Chris Wilson <chris@chris-wilson.co.uk>
Acked-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

diff --git a/drivers/gpu/drm/i915/intel_uncore.c b/drivers/gpu/drm/i915/intel_uncore.c
index 288a3a654f06894521af75fff978eb341e1b65a4..bfc1a65fcd9055e13550712ca32ab034b5a059cd 100644 (file)
--- a/drivers/gpu/drm/i915/intel_uncore.c
+++ b/drivers/gpu/drm/i915/intel_uncore.c
@@ -490,36 +490,6 @@ int i915_reg_read_ioctl(struct drm_device *dev,
        return 0;
 }
 
-static int i8xx_do_reset(struct drm_device *dev)
-{
-       struct drm_i915_private *dev_priv = dev->dev_private;
-
-       if (IS_I85X(dev))
-               return -ENODEV;
-
-       I915_WRITE(D_STATE, I915_READ(D_STATE) | DSTATE_GFX_RESET_I830);
-       POSTING_READ(D_STATE);
-
-       if (IS_I830(dev) || IS_845G(dev)) {
-               I915_WRITE(DEBUG_RESET_I830,
-                          DEBUG_RESET_DISPLAY |
-                          DEBUG_RESET_RENDER |
-                          DEBUG_RESET_FULL);
-               POSTING_READ(DEBUG_RESET_I830);
-               msleep(1);
-
-               I915_WRITE(DEBUG_RESET_I830, 0);
-               POSTING_READ(DEBUG_RESET_I830);
-       }
-
-       msleep(1);
-
-       I915_WRITE(D_STATE, I915_READ(D_STATE) & ~DSTATE_GFX_RESET_I830);
-       POSTING_READ(D_STATE);
-
-       return 0;
-}
-
 static int i965_reset_complete(struct drm_device *dev)
 {
        u8 gdrst;
@@ -621,7 +591,6 @@ int intel_gpu_reset(struct drm_device *dev)
        case 6: return gen6_do_reset(dev);
        case 5: return ironlake_do_reset(dev);
        case 4: return i965_do_reset(dev);
-       case 2: return i8xx_do_reset(dev);
        default: return -ENODEV;
        }
 }