drm/i915: kill gen4 gpu reset codehangman

It's busted. Compared to ilk, snb and ivb where I've run the i-g-t
hangman test in a loop for a few hours, my gm45 never managed to reset
the gpu. And Chris Wilson confirmed on irc that he's never seen a case
where the gen4 gpu reset code actually helped.

Given that it's not unlikely that this is causing harm, kill it.

Signed-Off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

1 files changed, 0 insertions, 37 deletions

diff --git a/drivers/gpu/drm/i915/i915_drv.c b/drivers/gpu/drm/i915/i915_drv.c
index 7a09c28f886e..0578c7974952 100644
--- a/drivers/gpu/drm/i915/i915_drv.c
+++ b/drivers/gpu/drm/i915/i915_drv.c
@@ -703,40 +703,6 @@ static int i8xx_do_reset(struct drm_device *dev)
 	return 0;
 }
 
-static int i965_reset_complete(struct drm_device *dev)
-{
-	u8 gdrst;
-	pci_read_config_byte(dev->pdev, I965_GDRST, &gdrst);
-	return gdrst & 0x1;
-}
-
-static int i965_do_reset(struct drm_device *dev)
-{
-	int ret;
-	u8 gdrst;
-
-	/*
-	 * Set the domains we want to reset (GRDOM/bits 2 and 3) as
-	 * well as the reset bit (GR/bit 0).  Setting the GR bit
-	 * triggers the reset; when done, the hardware will clear it.
-	 */
-	pci_read_config_byte(dev->pdev, I965_GDRST, &gdrst);
-	pci_write_config_byte(dev->pdev, I965_GDRST,
-			      gdrst | GRDOM_RENDER |
-			      GRDOM_RESET_ENABLE);
-	ret =  wait_for(i965_reset_complete(dev), 500);
-	if (ret)
-		return ret;
-
-	/* We can't reset render&media without also resetting display ... */
-	pci_read_config_byte(dev->pdev, I965_GDRST, &gdrst);
-	pci_write_config_byte(dev->pdev, I965_GDRST,
-			      gdrst | GRDOM_MEDIA |
-			      GRDOM_RESET_ENABLE);
-
-	return wait_for(i965_reset_complete(dev), 500);
-}
-
 static int ironlake_do_reset(struct drm_device *dev)
 {
 	struct drm_i915_private *dev_priv = dev->dev_private;
@@ -805,9 +771,6 @@ static int intel_gpu_reset(struct drm_device *dev)
 	case 5:
 		ret = ironlake_do_reset(dev);
 		break;
-	case 4:
-		ret = i965_do_reset(dev);
-		break;
 	case 2:
 		ret = i8xx_do_reset(dev);
 		break;