drm/i915: Init power domains early in driver load

Since

commit ac9b8236551d1177fd07b56aef9b565d1864420d
Author: Ville Syrjälä <ville.syrjala@linux.intel.com>
Date:   Fri Nov 27 18:55:26 2015 +0200

    drm/i915: Introduce a gmbus power domain

gmbus also needs the power domain infrastructure right from the start,
since as soon as we register the i2c controllers someone can use them.

v2: Adjust cleanup paths too (Chris).

v3: Rebase onto -nightly (totally bogus tree I had lying around) and
also move dpio init head (Ville).

v4: Ville instead suggested to move gmbus setup later in the sequence,
since it's only needed by the modeset code.

v5: Move even close to the actual user, right next to the comment that
states where we really need gmbus (and interrupts!).

Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
Cc: Patrik Jakobsson <patrik.jakobsson@linux.intel.com>
Cc: Imre Deak <imre.deak@intel.com>
Cc: Jani Nikula <jani.nikula@intel.com>
Cc: Meelis Roos <mroos@linux.ee>
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Fixes: ac9b8236551d ("drm/i915: Introduce a gmbus power domain")
Cc: stable@vger.kernel.org
References: http://www.spinics.net/lists/intel-gfx/msg83075.html
Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1452682528-19437-1-git-send-email-daniel.vetter@ffwll.ch
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

2 files changed, 5 insertions, 3 deletions

diff --git a/drivers/gpu/drm/i915/i915_dma.c b/drivers/gpu/drm/i915/i915_dma.c
index a81c76603544..aace06005f23 100644
--- a/drivers/gpu/drm/i915/i915_dma.c
+++ b/drivers/gpu/drm/i915/i915_dma.c
@@ -403,6 +403,8 @@ static int i915_load_modeset_init(struct drm_device *dev)
         if (ret)
                 goto cleanup_gem_stolen;
 
+        intel_setup_gmbus(dev);
+
         /* Important: The output setup functions called by modeset_init need
          * working irqs for e.g. gmbus and dp aux transfers. */
         intel_modeset_init(dev);
@@ -452,6 +454,7 @@ cleanup_gem:
 cleanup_irq:
         intel_guc_ucode_fini(dev);
         drm_irq_uninstall(dev);
+        intel_teardown_gmbus(dev);
 cleanup_gem_stolen:
         i915_gem_cleanup_stolen(dev);
 cleanup_vga_switcheroo:
@@ -1026,7 +1029,6 @@ int i915_driver_load(struct drm_device *dev, unsigned long flags)
 
         /* Try to make sure MCHBAR is enabled before poking at it */
         intel_setup_mchbar(dev);
-        intel_setup_gmbus(dev);
         intel_opregion_setup(dev);
 
         i915_gem_load(dev);
@@ -1097,7 +1099,6 @@ out_gem_unload:
         if (dev->pdev->msi_enabled)
                 pci_disable_msi(dev->pdev);
 
-        intel_teardown_gmbus(dev);
         intel_teardown_mchbar(dev);
         pm_qos_remove_request(&dev_priv->pm_qos);
         destroy_workqueue(dev_priv->gpu_error.hangcheck_wq);
@@ -1196,7 +1197,6 @@ int i915_driver_unload(struct drm_device *dev)
 
         intel_csr_ucode_fini(dev_priv);
 
-        intel_teardown_gmbus(dev);
         intel_teardown_mchbar(dev);
 
         destroy_workqueue(dev_priv->hotplug.dp_wq);
diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index 1ef715303cc6..1e3461fbb805 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -15821,6 +15821,8 @@ void intel_modeset_cleanup(struct drm_device *dev)
         mutex_lock(&dev->struct_mutex);
         intel_cleanup_gt_powersave(dev);
         mutex_unlock(&dev->struct_mutex);
+
+        intel_teardown_gmbus(dev);
 }
 
 /*