[Intel-gfx] [PATCH v2 3/4] drm/i915/gen9: Disable DC states if power well support is disabled

[Patrik Jakobsson]

On Mon, Feb 29, 2016 at 10:49:04PM +0200, Imre Deak wrote:
> If power well support is disabled via the i915.disable_power_well module
> option we should never enable DC states. Currently we would enable DC
> states even in this case during system suspend, where we need to disable
> all power wells regardless of the disable_power_well option.
> 
> CC: Patrik Jakobsson <patrik.jakobsson at linux.intel.com>
> Signed-off-by: Imre Deak <imre.deak at intel.com>

Reviewed-by: Patrik Jakobsson <patrik.jakobsson at linux.intel.com>

> ---
>  drivers/gpu/drm/i915/intel_runtime_pm.c | 3 +++
>  1 file changed, 3 insertions(+)
> 
> diff --git a/drivers/gpu/drm/i915/intel_runtime_pm.c b/drivers/gpu/drm/i915/intel_runtime_pm.c
> index 30df9de..f0ca5134 100644
> --- a/drivers/gpu/drm/i915/intel_runtime_pm.c
> +++ b/drivers/gpu/drm/i915/intel_runtime_pm.c
> @@ -2034,6 +2034,9 @@ static uint32_t get_allowed_dc_mask(const struct drm_i915_private *dev_priv,
>  		mask = 0;
>  	}
>  
> +	if (!i915.disable_power_well)
> +		max_dc = 0;
> +
>  	if (enable_dc >= 0 && enable_dc <= max_dc) {
>  		requested_dc = enable_dc;
>  	} else if (enable_dc == -1) {
> -- 
> 2.5.0
> 

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