drm/i915: don't save/restore DSPARB on gen5+
Because the register does not exist in gen5+.
This patch solves "unclaimed register" messages on Haswell after
suspend/resume.
Signed-off-by: Paulo Zanoni <paulo.r.zanoni@intel.com>
Reviewed-by: Jani Nikula <jani.nikula@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
diff --git a/drivers/gpu/drm/i915/i915_suspend.c b/drivers/gpu/drm/i915/i915_suspend.c
index 63d4d30..95c0582 100644
--- a/drivers/gpu/drm/i915/i915_suspend.c
+++ b/drivers/gpu/drm/i915/i915_suspend.c
@@ -620,7 +620,8 @@
struct drm_i915_private *dev_priv = dev->dev_private;
/* Display arbitration control */
- dev_priv->regfile.saveDSPARB = I915_READ(DSPARB);
+ if (INTEL_INFO(dev)->gen <= 4)
+ dev_priv->regfile.saveDSPARB = I915_READ(DSPARB);
/* This is only meaningful in non-KMS mode */
/* Don't regfile.save them in KMS mode */
@@ -707,7 +708,8 @@
struct drm_i915_private *dev_priv = dev->dev_private;
/* Display arbitration */
- I915_WRITE(DSPARB, dev_priv->regfile.saveDSPARB);
+ if (INTEL_INFO(dev)->gen <= 4)
+ I915_WRITE(DSPARB, dev_priv->regfile.saveDSPARB);
if (!drm_core_check_feature(dev, DRIVER_MODESET)) {
/* Display port ratios (must be done before clock is set) */