Oops in i915 intel_init_clock_gating

[Jesse Barnes]

On Wed, 15 Jun 2011 16:08:51 -0400 (EDT)
Alan Stern <stern at rowland.harvard.edu> wrote:

> The problem of dev_priv->display.init_clock_gating not getting set is 
> still present in 3.0-rc3.  On my system this happens because 
> intel_init_display() never gets called in the first place.
> 
> AFAICT, the normal calling sequence during driver initialization is:
> 
>       i915_driver_load() -> i915_load_modeset_init() ->
>               intel_modeset_init() -> intel_init_display().
> 
> But in my case the call to i915_load_modeset_init() doesn't occur 
> because drm_core_check_feature(dev, DRIVER_MODESET) is False.

Ouch, a non-KMS config.  Any reason you can't use KMS?

This patch should help at any rate.

-- 
Jesse Barnes, Intel Open Source Technology Center

diff --git a/drivers/gpu/drm/i915/i915_drv.c b/drivers/gpu/drm/i915/i915_drv.c
index 0defd42..a1a28fb 100644
--- a/drivers/gpu/drm/i915/i915_drv.c
+++ b/drivers/gpu/drm/i915/i915_drv.c
@@ -429,6 +429,9 @@ static int i915_drm_thaw(struct drm_device *dev)
        /* KMS EnterVT equivalent */
        if (drm_core_check_feature(dev, DRIVER_MODESET)) {
                mutex_lock(&dev->struct_mutex);
+
+               intel_init_clock_gating(dev);
+
                dev_priv->mm.suspended = 0;

                error = i915_gem_init_ringbuffer(dev);
diff --git a/drivers/gpu/drm/i915/i915_suspend.c 
b/drivers/gpu/drm/i915/i915_suspend.c
index 60a94d2..b478d16 100644
--- a/drivers/gpu/drm/i915/i915_suspend.c
+++ b/drivers/gpu/drm/i915/i915_suspend.c
@@ -863,8 +863,6 @@ int i915_restore_state(struct drm_device *dev)
                I915_WRITE(IMR, dev_priv->saveIMR);
        }

-       intel_init_clock_gating(dev);
-
        if (IS_IRONLAKE_M(dev)) {
                ironlake_enable_drps(dev);
                intel_init_emon(dev);