Re: [PATCH 11/14] drm/i915: Be more careful when picking the initial power sequencer pipe

[Imre Deak <imre.deak@intel.com>]

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On Mon, 2014-08-18 at 22:16 +0300, ville.syrjala@linux.intel.com wrote:
> From: Ville Syrjälä <ville.syrjala@linux.intel.com>
> 
> Try to make sure we find the power sequencer that the BIOS used
> by first looking for one which has the panel power enabled, then
> fall back to one with VDD force bit enabled, and finally look at
> just the port select bits. This should make us pick the correct
> power sequencer when the BIOS has already enabled the panel.
> 
> Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>

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

> ---
>  drivers/gpu/drm/i915/intel_dp.c | 36 ++++++++++++++++++++++++++++++++++--
>  1 file changed, 34 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
> index 4614e6e..4952783 100644
> --- a/drivers/gpu/drm/i915/intel_dp.c
> +++ b/drivers/gpu/drm/i915/intel_dp.c
> @@ -341,9 +341,31 @@ vlv_power_sequencer_pipe(struct intel_dp *intel_dp)
>  	return intel_dp->pps_pipe;
>  }
>  
> +typedef bool (*vlv_pipe_check)(struct drm_i915_private *dev_priv,
> +			       enum pipe pipe);
> +
> +static bool vlv_pipe_has_pp_on(struct drm_i915_private *dev_priv,
> +			       enum pipe pipe)
> +{
> +	return I915_READ(VLV_PIPE_PP_STATUS(pipe)) & PP_ON;
> +}
> +
> +static bool vlv_pipe_has_vdd_on(struct drm_i915_private *dev_priv,
> +				enum pipe pipe)
> +{
> +	return I915_READ(VLV_PIPE_PP_CONTROL(pipe)) & EDP_FORCE_VDD;
> +}
> +
> +static bool vlv_pipe_any(struct drm_i915_private *dev_priv,
> +			 enum pipe pipe)
> +{
> +	return true;
> +}
> +
>  static enum pipe
>  vlv_initial_power_sequencer_pipe(struct drm_i915_private *dev_priv,
> -				 enum port port)
> +				 enum port port,
> +				 vlv_pipe_check pipe_check)
>  {
>  	enum pipe pipe;
>  
> @@ -354,6 +376,9 @@ vlv_initial_power_sequencer_pipe(struct drm_i915_private *dev_priv,
>  		if (port_sel != PANEL_PORT_SELECT_VLV(port))
>  			continue;
>  
> +		if (!pipe_check(dev_priv, pipe))
> +			continue;
> +
>  		return pipe;
>  	}
>  
> @@ -372,7 +397,14 @@ vlv_initial_power_sequencer_setup(struct intel_dp *intel_dp)
>  	lockdep_assert_held(&dev_priv->pps_mutex);
>  
>  	/* try to find a pipe with this port selected */
> -	intel_dp->pps_pipe = vlv_initial_power_sequencer_pipe(dev_priv, port);
> +	/* first pick one where the panel is on */
> +	intel_dp->pps_pipe = vlv_initial_power_sequencer_pipe(dev_priv, port, vlv_pipe_has_pp_on);
> +	/* didn't find one? pick one where vdd is on */
> +	if (intel_dp->pps_pipe == INVALID_PIPE)
> +		intel_dp->pps_pipe = vlv_initial_power_sequencer_pipe(dev_priv, port, vlv_pipe_has_vdd_on);
> +	/* didn't find one? pick one with just the correct port */
> +	if (intel_dp->pps_pipe == INVALID_PIPE)
> +		intel_dp->pps_pipe = vlv_initial_power_sequencer_pipe(dev_priv, port, vlv_pipe_any);
>  
>  	/* didn't find one? just let vlv_power_sequencer_pipe() pick one when needed */
>  	if (intel_dp->pps_pipe == INVALID_PIPE) {


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