[Intel-gfx] [PATCH 1/2] drm/i915: Call intel_dp_mst_resume() before resuming displays

[Daniel Vetter]

On Fri, Mar 11, 2016 at 10:57:01AM -0500, Lyude wrote:
> Since we need MST devices ready before we try to resume displays,
> calling this after intel_display_resume() can result in some issues with
> various laptop docks where the monitor won't turn back on after
> suspending the system.
> 
> This order was originally changed in
> 
> 	commit e7d6f7d70829 ("drm/i915: resume MST after reading back hw state")
> 
> In order to fix some unclaimed register errors, however the actual cause
> of those has since been fixed.
> 
> CC: stable at vger.kernel.org
> Signed-off-by: Lyude <cpaul at redhat.com>

Don't we need to first apply patch 2/2 to avoid breaking systems
in-between?
-Daniel

> ---
>  drivers/gpu/drm/i915/i915_drv.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/i915_drv.c b/drivers/gpu/drm/i915/i915_drv.c
> index f357058..08854ae 100644
> --- a/drivers/gpu/drm/i915/i915_drv.c
> +++ b/drivers/gpu/drm/i915/i915_drv.c
> @@ -761,12 +761,12 @@ static int i915_drm_resume(struct drm_device *dev)
>  		dev_priv->display.hpd_irq_setup(dev);
>  	spin_unlock_irq(&dev_priv->irq_lock);
>  
> +	intel_dp_mst_resume(dev);
> +
>  	drm_modeset_lock_all(dev);
>  	intel_display_resume(dev);
>  	drm_modeset_unlock_all(dev);
>  
> -	intel_dp_mst_resume(dev);
> -
>  	/*
>  	 * ... but also need to make sure that hotplug processing
>  	 * doesn't cause havoc. Like in the driver load code we don't
> -- 
> 2.5.0
> 
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-- 
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch