[Intel-gfx] [PATCH 10/26] drm/i915: add more clock gating for VLV, allow force wake at init

[Jesse Barnes]

From: Ben Widawsky <ben at bwidawsk.net>

Disable all Gunit clock gating and make set the "allow force wake" bit.

Signed-off-by: Jesse Barnes <jbarnes at virtuousgeek.org>
---
 drivers/gpu/drm/i915/i915_gem.c |    4 ++++
 drivers/gpu/drm/i915/i915_reg.h |    1 +
 drivers/gpu/drm/i915/intel_pm.c |   10 +++++++++-
 3 files changed, 14 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
index 8413ffc..dd67698 100644
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -4010,7 +4010,11 @@ int i915_gem_init(struct drm_device *dev)
 	int ret;
 
 	mutex_lock(&dev->struct_mutex);
+
+	/* VLVA0 (potential hack), BIOS isn't actually waking us */
+	I915_WRITE(VLV_GTLC_WAKE_CTRL, 1);
 	i915_gem_init_global_gtt(dev);
+
 	ret = i915_gem_init_hw(dev);
 	mutex_unlock(&dev->struct_mutex);
 	if (ret) {
diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index 539301d..6c037b2 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -4273,6 +4273,7 @@
 #define  FORCEWAKE_ACK_VLV			0x1300b4
 #define  FORCEWAKE_ACK_HSW			0x130044
 #define  FORCEWAKE_ACK				0x130090
+#define  VLV_GTLC_WAKE_CTRL			0x130090
 #define  FORCEWAKE_MT				0xa188 /* multi-threaded */
 #define   FORCEWAKE_KERNEL			0x1
 #define   FORCEWAKE_USER			0x2
diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
index 59ea12a..f29a1a2 100644
--- a/drivers/gpu/drm/i915/intel_pm.c
+++ b/drivers/gpu/drm/i915/intel_pm.c
@@ -3987,7 +3987,15 @@ static void valleyview_init_clock_gating(struct drm_device *dev)
 	 * Disable clock gating on th GCFG unit to prevent a delay
 	 * in the reporting of vblank events.
 	 */
-	I915_WRITE(VLV_GUNIT_CLOCK_GATE, GCFG_DIS);
+	/* VLVA0 HACK */
+	I915_WRITE(VLV_GUNIT_CLOCK_GATE, 0xffffffff);
+	I915_WRITE(0x9400, 0xffffffff);
+	I915_WRITE(0x9404, 0xffffffff);
+	I915_WRITE(0x9408, 0xffffffff);
+	I915_WRITE(0x940c, 0xffffffff);
+	I915_WRITE(0x9410, 0xffffffff);
+	I915_WRITE(0x9414, 0xffffffff);
+	I915_WRITE(0x9418, 0xffffffff);
 }
 
 static void g4x_init_clock_gating(struct drm_device *dev)
-- 
1.7.9.5