drm/i915: allow force wake at init time on VLV v2
We need to set the 'allow force wake' bit to enable forcewake handling
later on.
v2: split from clock gating patch (Jani)
check for allowwakeack (Ville)
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
index 1417fc6..d554b21 100644
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -4010,7 +4010,16 @@
int ret;
mutex_lock(&dev->struct_mutex);
+
+ if (IS_VALLEYVIEW(dev)) {
+ /* VLVA0 (potential hack), BIOS isn't actually waking us */
+ I915_WRITE(VLV_GTLC_WAKE_CTRL, 1);
+ if (wait_for((I915_READ(VLV_GTLC_PW_STATUS) & 1) == 1, 10))
+ DRM_DEBUG_DRIVER("allow wake ack timed out\n");
+ }
+
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 4cf3ece..f187b60 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -4150,6 +4150,8 @@
#define FORCEWAKE_ACK_VLV 0x1300b4
#define FORCEWAKE_ACK_HSW 0x130044
#define FORCEWAKE_ACK 0x130090
+#define VLV_GTLC_WAKE_CTRL 0x130090
+#define VLV_GTLC_PW_STATUS 0x130094
#define FORCEWAKE_MT 0xa188 /* multi-threaded */
#define FORCEWAKE_KERNEL 0x1
#define FORCEWAKE_USER 0x2