drm/i915: save/restore interrupt state

On resume, if the interrupt state isn't restored correctly, we may end
up with a flood of unexpected or ill-timed interrupts, which could cause
the kernel to disable the interrupt or vblank events to happen at the
wrong time.  So save/restore them properly.

Signed-off-by: Dave Airlie <airlied@linux.ie>

1 files changed, 7 insertions, 0 deletions

diff --git a/drivers/char/drm/i915_drv.c b/drivers/char/drm/i915_drv.c
index 52e51033d32c..0f525ad536a4 100644
--- a/drivers/char/drm/i915_drv.c
+++ b/drivers/char/drm/i915_drv.c
@@ -276,6 +276,7 @@ static int i915_suspend(struct drm_device *dev)
                 dev_priv->saveDSPATILEOFF = I915_READ(DSPATILEOFF);
         }
         i915_save_palette(dev, PIPE_A);
+        dev_priv->savePIPEASTAT = I915_READ(I915REG_PIPEASTAT);
 
         /* Pipe & plane B info */
         dev_priv->savePIPEBCONF = I915_READ(PIPEBCONF);
@@ -303,6 +304,7 @@ static int i915_suspend(struct drm_device *dev)
                 dev_priv->saveDSPBTILEOFF = I915_READ(DSPBTILEOFF);
         }
         i915_save_palette(dev, PIPE_B);
+        dev_priv->savePIPEBSTAT = I915_READ(I915REG_PIPEBSTAT);
 
         /* CRT state */
         dev_priv->saveADPA = I915_READ(ADPA);
@@ -329,6 +331,11 @@ static int i915_suspend(struct drm_device *dev)
         dev_priv->saveFBC_CONTROL2 = I915_READ(FBC_CONTROL2);
         dev_priv->saveFBC_CONTROL = I915_READ(FBC_CONTROL);
 
+        /* Interrupt state */
+        dev_priv->saveIIR = I915_READ(I915REG_INT_IDENTITY_R);
+        dev_priv->saveIER = I915_READ(I915REG_INT_ENABLE_R);
+        dev_priv->saveIMR = I915_READ(I915REG_INT_MASK_R);
+
         /* VGA state */
         dev_priv->saveVCLK_DIVISOR_VGA0 = I915_READ(VCLK_DIVISOR_VGA0);
         dev_priv->saveVCLK_DIVISOR_VGA1 = I915_READ(VCLK_DIVISOR_VGA1);