drm/i915: restore render clock gating on resume
Rather than restoring just a few clock gating registers on resume,
just reinitialize the whole thing.
Signed-off-by: Andy Lutomirski <luto@mit.edu>
[anholt: Fixed up for RC6 support landed since the patch was written]
Signed-off-by: Eric Anholt <eric@anholt.net>
diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index 902cc53..279dc96 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -4584,28 +4584,33 @@
struct drm_i915_gem_object *obj_priv;
int ret;
- pwrctx = drm_gem_object_alloc(dev, 4096);
- if (!pwrctx) {
- DRM_DEBUG("failed to alloc power context, RC6 disabled\n");
- goto out;
+ if (dev_priv->pwrctx) {
+ obj_priv = dev_priv->pwrctx->driver_private;
+ } else {
+ pwrctx = drm_gem_object_alloc(dev, 4096);
+ if (!pwrctx) {
+ DRM_DEBUG("failed to alloc power context, "
+ "RC6 disabled\n");
+ goto out;
+ }
+
+ ret = i915_gem_object_pin(pwrctx, 4096);
+ if (ret) {
+ DRM_ERROR("failed to pin power context: %d\n",
+ ret);
+ drm_gem_object_unreference(pwrctx);
+ goto out;
+ }
+
+ i915_gem_object_set_to_gtt_domain(pwrctx, 1);
+
+ dev_priv->pwrctx = pwrctx;
+ obj_priv = pwrctx->driver_private;
}
- ret = i915_gem_object_pin(pwrctx, 4096);
- if (ret) {
- DRM_ERROR("failed to pin power context: %d\n", ret);
- drm_gem_object_unreference(pwrctx);
- goto out;
- }
-
- i915_gem_object_set_to_gtt_domain(pwrctx, 1);
-
- obj_priv = pwrctx->driver_private;
-
I915_WRITE(PWRCTXA, obj_priv->gtt_offset | PWRCTX_EN);
I915_WRITE(MCHBAR_RENDER_STANDBY,
I915_READ(MCHBAR_RENDER_STANDBY) & ~RCX_SW_EXIT);
-
- dev_priv->pwrctx = pwrctx;
}
out: