Re: [PATCH] drm/i915: Init power domains early in driver load

[Meelis Roos <mroos@linux.ee>]

> 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>
> ---
> 
> Meelis, can you pls retest this one?

Tested successfully on SNB computer.

> 
> Thanks, Daniel
> ---
>  drivers/gpu/drm/i915/i915_dma.c      | 6 +++---
>  drivers/gpu/drm/i915/intel_display.c | 2 ++
>  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 988a3806512a..d70d96fe553b 100644
> --- a/drivers/gpu/drm/i915/i915_dma.c
> +++ b/drivers/gpu/drm/i915/i915_dma.c
> @@ -406,6 +406,8 @@ 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);
> @@ -455,6 +457,7 @@ 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:
> @@ -1028,7 +1031,6 @@ 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);
> @@ -1101,7 +1103,6 @@ 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);
> @@ -1203,7 +1204,6 @@ 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 37945ddb4dad..ac0038bf4fbf 100644
> --- a/drivers/gpu/drm/i915/intel_display.c
> +++ b/drivers/gpu/drm/i915/intel_display.c
> @@ -15971,6 +15971,8 @@ 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);
>  }
>  
>  /*
> 

-- 
Meelis Roos (mroos@ut.ee)      http://www.cs.ut.ee/~mroos/