[Intel-gfx] [PATCH 09/19] drm/i915: get a runtime PM reference when the panel VDD is on

[Rodrigo Vivi]

On Thu, Nov 21, 2013 at 01:47:23PM -0200, Paulo Zanoni wrote:
> From: Paulo Zanoni <paulo.r.zanoni at intel.com>
> 
> And put it when it's off. Otherwise, when you run pm_pc8 from
> intel-gpu-tools, and the delayed function that disables VDD runs,
> we'll get some messages saying we're touching registers while the HW
> is suspended.
> 
> Signed-off-by: Paulo Zanoni <paulo.r.zanoni at intel.com>
> ---
>  drivers/gpu/drm/i915/intel_dp.c | 7 +++++++
>  1 file changed, 7 insertions(+)
> 
> diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
> index 28fc070..9e9e3d6 100644
> --- a/drivers/gpu/drm/i915/intel_dp.c
> +++ b/drivers/gpu/drm/i915/intel_dp.c
> @@ -1092,6 +1092,8 @@ void ironlake_edp_panel_vdd_on(struct intel_dp *intel_dp)
>  	if (ironlake_edp_have_panel_vdd(intel_dp))
>  		return;
>  
> +	intel_runtime_pm_get(dev_priv);
> +
>  	DRM_DEBUG_KMS("Turning eDP VDD on\n");
>  
>  	if (!ironlake_edp_have_panel_power(intel_dp))
> @@ -1141,6 +1143,8 @@ static void ironlake_panel_vdd_off_sync(struct intel_dp *intel_dp)
>  		DRM_DEBUG_KMS("PP_STATUS: 0x%08x PP_CONTROL: 0x%08x\n",
>  		I915_READ(pp_stat_reg), I915_READ(pp_ctrl_reg));
>  		msleep(intel_dp->panel_power_down_delay);
> +
> +		intel_runtime_pm_put(dev_priv);
>  	}
>  }
>  
> @@ -1248,6 +1252,9 @@ void ironlake_edp_panel_off(struct intel_dp *intel_dp)
>  	intel_dp->want_panel_vdd = false;
>  
>  	ironlake_wait_panel_off(intel_dp);
> +
> +	/* We got a reference when we enabled the VDD. */
> +	intel_runtime_pm_put(dev_priv);

I was going to say it was missing a get until I read the comment above.
But if it gets on VDD on, why not just let it put back on VDD off instead?

>  }
>  
>  void ironlake_edp_backlight_on(struct intel_dp *intel_dp)
> -- 
> 1.8.3.1
> 
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