drm/i915: introduce haswell_init_clock_gating

This is based on Ivy Bridge clock gating for now, but is subject to
changes in the future.

Note: Compared to the ivb clock gating this drops the the IDICOS
medium uncore sharing tuned in

commit 208482232de3590cee4757dfabe5d8cee8c6e626
Author: Ben Widawsky <ben@bwidawsk.net>
Date:   Fri May 4 18:58:59 2012 -0700

    drm/i915: set IDICOS to medium uncore resources

Eugeni wants to benchmark the effect of this first.

Signed-off-by: Eugeni Dodonov <eugeni.dodonov@intel.com>
[danvet: added note]
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

1 files changed, 53 insertions, 1 deletions

diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
index c06785ed3f43..3c2724e42975 100644
--- a/drivers/gpu/drm/i915/intel_pm.c
+++ b/drivers/gpu/drm/i915/intel_pm.c
@@ -3417,6 +3417,58 @@ static void gen7_setup_fixed_func_scheduler(struct drm_i915_private *dev_priv)
         I915_WRITE(GEN7_FF_THREAD_MODE, reg);
 }
 
+static void haswell_init_clock_gating(struct drm_device *dev)
+{
+        struct drm_i915_private *dev_priv = dev->dev_private;
+        int pipe;
+        uint32_t dspclk_gate = VRHUNIT_CLOCK_GATE_DISABLE;
+
+        I915_WRITE(PCH_DSPCLK_GATE_D, dspclk_gate);
+
+        I915_WRITE(WM3_LP_ILK, 0);
+        I915_WRITE(WM2_LP_ILK, 0);
+        I915_WRITE(WM1_LP_ILK, 0);
+
+        /* According to the spec, bit 13 (RCZUNIT) must be set on IVB.
+         * This implements the WaDisableRCZUnitClockGating workaround.
+         */
+        I915_WRITE(GEN6_UCGCTL2, GEN6_RCZUNIT_CLOCK_GATE_DISABLE);
+
+        I915_WRITE(ILK_DSPCLK_GATE, IVB_VRHUNIT_CLK_GATE);
+
+        I915_WRITE(IVB_CHICKEN3,
+                   CHICKEN3_DGMG_REQ_OUT_FIX_DISABLE |
+                   CHICKEN3_DGMG_DONE_FIX_DISABLE);
+
+        /* Apply the WaDisableRHWOOptimizationForRenderHang workaround. */
+        I915_WRITE(GEN7_COMMON_SLICE_CHICKEN1,
+                   GEN7_CSC1_RHWO_OPT_DISABLE_IN_RCC);
+
+        /* WaApplyL3ControlAndL3ChickenMode requires those two on Ivy Bridge */
+        I915_WRITE(GEN7_L3CNTLREG1,
+                        GEN7_WA_FOR_GEN7_L3_CONTROL);
+        I915_WRITE(GEN7_L3_CHICKEN_MODE_REGISTER,
+                        GEN7_WA_L3_CHICKEN_MODE);
+
+        /* This is required by WaCatErrorRejectionIssue */
+        I915_WRITE(GEN7_SQ_CHICKEN_MBCUNIT_CONFIG,
+                        I915_READ(GEN7_SQ_CHICKEN_MBCUNIT_CONFIG) |
+                        GEN7_SQ_CHICKEN_MBCUNIT_SQINTMOB);
+
+        for_each_pipe(pipe) {
+                I915_WRITE(DSPCNTR(pipe),
+                           I915_READ(DSPCNTR(pipe)) |
+                           DISPPLANE_TRICKLE_FEED_DISABLE);
+                intel_flush_display_plane(dev_priv, pipe);
+        }
+
+        gen7_setup_fixed_func_scheduler(dev_priv);
+
+        /* WaDisable4x2SubspanOptimization */
+        I915_WRITE(CACHE_MODE_1,
+                   _MASKED_BIT_ENABLE(PIXEL_SUBSPAN_COLLECT_OPT_DISABLE));
+}
+
 static void ivybridge_init_clock_gating(struct drm_device *dev)
 {
         struct drm_i915_private *dev_priv = dev->dev_private;
@@ -3826,7 +3878,7 @@ void intel_init_pm(struct drm_device *dev)
                                               "Disable CxSR\n");
                                 dev_priv->display.update_wm = NULL;
                         }
-                        dev_priv->display.init_clock_gating = ivybridge_init_clock_gating;
+                        dev_priv->display.init_clock_gating = haswell_init_clock_gating;
                         dev_priv->display.sanitize_pm = gen6_sanitize_pm;
                 } else
                         dev_priv->display.update_wm = NULL;