[Intel-gfx] drm/i915/slpc: Send shutdown event

[David Weinehall]

On Sat, Aug 20, 2016 at 10:39:12AM +0530, Sagar Arun Kamble wrote:
> From: Tom O'Rourke <Tom.O'Rourke at intel.com>
> 
> Send SLPC shutdown event during disable, suspend, and reset
> operations.  Sending shutdown event while already shutdown
> is OK.
> 
> v2: return void instead of ignored error code (Paulo)
> 
> v5: Removed WARN_ON for checking msb of gtt address of
>     shared gem obj. (ChrisW)
>     Added SLPC state update during disable, suspend and reset.
>     Changed semantics of reset. It is supposed to just disable. (Sagar)
> 
> Signed-off-by: Tom O'Rourke <Tom.O'Rourke at intel.com>
> Signed-off-by: Sagar Arun Kamble <sagar.a.kamble at intel.com>
> ---
>  drivers/gpu/drm/i915/intel_slpc.c | 22 +++++++++++++++++++---
>  1 file changed, 19 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/intel_slpc.c b/drivers/gpu/drm/i915/intel_slpc.c
> index 161cd13..5a1e6f2 100644
> --- a/drivers/gpu/drm/i915/intel_slpc.c
> +++ b/drivers/gpu/drm/i915/intel_slpc.c
> @@ -52,6 +52,19 @@ static void host2guc_slpc_reset(struct drm_i915_private *dev_priv)
>  	host2guc_slpc(dev_priv, data, 4);
>  }
>  
> +static void host2guc_slpc_shutdown(struct drm_i915_private *dev_priv)
> +{
> +	u32 data[4];
> +	u32 shared_data_gtt_offset = i915_ggtt_offset(dev_priv->guc.slpc.vma);
> +
> +	data[0] = HOST2GUC_ACTION_SLPC_REQUEST;
> +	data[1] = SLPC_EVENT(SLPC_EVENT_SHUTDOWN, 2);
> +	data[2] = shared_data_gtt_offset;
> +	data[3] = 0;
> +
> +	host2guc_slpc(dev_priv, data, 4);
> +}
> +
>  static u8 slpc_get_platform_sku(struct drm_device *dev)
>  {
>  	enum slpc_platform_sku platform_sku;
> @@ -149,12 +162,14 @@ void intel_slpc_cleanup(struct drm_i915_private *dev_priv)
>  
>  void intel_slpc_suspend(struct drm_i915_private *dev_priv)
>  {
> -	return;
> +	host2guc_slpc_shutdown(dev_priv);
> +	dev_priv->guc.slpc.enabled = false;
>  }
>  
>  void intel_slpc_disable(struct drm_i915_private *dev_priv)
>  {
> -	return;
> +	host2guc_slpc_shutdown(dev_priv);
> +	dev_priv->guc.slpc.enabled = false;
>  }
>  
>  void intel_slpc_enable(struct drm_i915_private *dev_priv)
> @@ -167,5 +182,6 @@ void intel_slpc_enable(struct drm_i915_private *dev_priv)
>  
>  void intel_slpc_reset(struct drm_i915_private *dev_priv)
>  {
> -	return;
> +	host2guc_slpc_shutdown(dev_priv);
> +	dev_priv->guc.slpc.enabled = false;
>  }

Reviewed-by: David Weinehall <david.weinehall at linux.intel.com>
-- 
 /) David Weinehall <tao at acc.umu.se> /) Northern lights wander      (\
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