[Intel-gfx] [PATCH] drm/i915: Init power domains early in driver load

[Chris Wilson]

On Thu, Jan 07, 2016 at 10:10:56AM +0100, Daniel Vetter wrote:
> Since
> 
> commit ac9b8236551d1177fd07b56aef9b565d1864420d
> Author: Ville Syrjälä <ville.syrjala at 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.
> 
> Cc: Ville Syrjälä <ville.syrjala at linux.intel.com>
> Cc: Patrik Jakobsson <patrik.jakobsson at linux.intel.com>
> Cc: Imre Deak <imre.deak at intel.com>
> Cc: Jani Nikula <jani.nikula at intel.com>
> Cc: Meelis Roos <mroos at linux.ee>
> Fixes: ac9b8236551d ("drm/i915: Introduce a gmbus power domain")
> Cc: stable at vger.kernel.org
> References: http://www.spinics.net/lists/intel-gfx/msg83075.html
> Signed-off-by: Daniel Vetter <daniel.vetter at intel.com>
> ---
>  drivers/gpu/drm/i915/i915_dma.c | 6 ++----
>  1 file changed, 2 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/i915_dma.c b/drivers/gpu/drm/i915/i915_dma.c
> index b4741d121a74..405aba2ca736 100644
> --- a/drivers/gpu/drm/i915/i915_dma.c
> +++ b/drivers/gpu/drm/i915/i915_dma.c
> @@ -396,8 +396,6 @@ static int i915_load_modeset_init(struct drm_device *dev)
>  	if (ret)
>  		goto cleanup_vga_switcheroo;
>  
> -	intel_power_domains_init_hw(dev_priv);
> -
>  	ret = intel_irq_install(dev_priv);
>  	if (ret)
>  		goto cleanup_gem_stolen;
> @@ -1025,6 +1023,8 @@ int i915_driver_load(struct drm_device *dev, unsigned long flags)
>  
>  	intel_irq_init(dev_priv);
>  	intel_uncore_sanitize(dev);
> +	intel_power_domains_init(dev_priv);
> +	intel_power_domains_init_hw(dev_priv);

A long time ago you wished for static/runtime analysis to check the
ordering constraints, so do I :|

>  
>  	/* Try to make sure MCHBAR is enabled before poking at it */
>  	intel_setup_mchbar(dev);
> @@ -1057,8 +1057,6 @@ int i915_driver_load(struct drm_device *dev, unsigned long flags)
>  			goto out_gem_unload;
>  	}
>  
> -	intel_power_domains_init(dev_priv);

Wouldn't you also have to update the unwind-on-error paths?
-Chris

-- 
Chris Wilson, Intel Open Source Technology Centre