drm/i915: add render standby support

Render standy allows the GPU to power down the render unit when idle.
In order for this to work, it needs a page of graphics memory to save
state.  This patch allocates that page and enables the feature on
supported chipsets.

Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Signed-off-by: Eric Anholt <eric@anholt.net>

1 files changed, 41 insertions, 0 deletions

diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index 099f420de57..8945656dc1d 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -4296,6 +4296,42 @@ void intel_init_clock_gating(struct drm_device *dev)
         } else if (IS_I830(dev)) {
                 I915_WRITE(DSPCLK_GATE_D, OVRUNIT_CLOCK_GATE_DISABLE);
         }
+
+        /*
+         * GPU can automatically power down the render unit if given a page
+         * to save state.
+         */
+        if (I915_HAS_RC6(dev)) {
+                struct drm_gem_object *pwrctx;
+                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;
+                }
+
+                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:
+        return;
 }
 
 /* Set up chip specific display functions */
@@ -4450,6 +4486,11 @@ void intel_modeset_cleanup(struct drm_device *dev)
         if (dev_priv->display.disable_fbc)
                 dev_priv->display.disable_fbc(dev);
 
+        if (dev_priv->pwrctx) {
+                i915_gem_object_unpin(dev_priv->pwrctx);
+                drm_gem_object_unreference(dev_priv->pwrctx);
+        }
+
         drm_mode_config_cleanup(dev);
 }