Re: [PATCH] drm/i915/bxt: Disable power well support

From: Imre Deak <imre.deak@intel.com>
To: Matt Roper <matthew.d.roper@intel.com>, intel-gfx@lists.freedesktop.org
Subject: Re: [PATCH] drm/i915/bxt: Disable power well support
Date: Tue, 01 Dec 2015 20:33:19 +0200	[thread overview]
Message-ID: <1448994799.14710.52.camel@intel.com> (raw)
In-Reply-To: <1448990818-11005-1-git-send-email-matthew.d.roper@intel.com>

On ti, 2015-12-01 at 09:26 -0800, Matt Roper wrote:
> BXT power well support is not yet stable.  Starting with patch
> 
>         commit 9f836f9016ad5320e0c9230419d2102cf15a28aa
>         Author: Patrik Jakobsson <patrik.jakobsson@linux.intel.com>
>         Date:   Mon Nov 16 16:20:01 2015 +0100
> 
>             drm/i915/gen9: Turn DC handling into a power well
> 
> DPMS off operations may actually cause the entire system to powerdown or
> reboot.  Disable power well support for now until Broxton gets fixes
> similar to what we have for SKL.
> 
> Cc: Imre Deak <imre.deak@intel.com>
> Cc: Patrik Jakobsson <patrik.jakobsson@linux.intel.com>
> References: http://lists.freedesktop.org/archives/intel-gfx/2015-November/081037.html
> Signed-off-by: Matt Roper <matthew.d.roper@intel.com>

Reviewed-by: Imre Deak <imre.deak@intel.com>

> ---
>  drivers/gpu/drm/i915/intel_runtime_pm.c | 5 +++++
>  1 file changed, 5 insertions(+)
> 
> diff --git a/drivers/gpu/drm/i915/intel_runtime_pm.c
> b/drivers/gpu/drm/i915/intel_runtime_pm.c
> index 469927e..2c2151f 100644
> --- a/drivers/gpu/drm/i915/intel_runtime_pm.c
> +++ b/drivers/gpu/drm/i915/intel_runtime_pm.c
> @@ -1911,6 +1911,11 @@ sanitize_disable_power_well_option(const
> struct drm_i915_private *dev_priv,
>  	if (disable_power_well >= 0)
>  		return !!disable_power_well;
>  
> +	if (IS_BROXTON(dev_priv)) {
> +		DRM_DEBUG_KMS("Disabling display power well
> support\n");
> +		return 0;
> +	}
> +
>  	return 1;
>  }
>  
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