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Date:	Mon, 01 Sep 2014 16:28:27 +0300
From:	Imre Deak <imre.deak@...el.com>
To:	Dave Airlie <airlied@...il.com>
Cc:	Mike Galbraith <umgwanakikbuti@...il.com>,
	Daniel Vetter <daniel.vetter@...ll.ch>,
	intel-gfx <intel-gfx@...ts.freedesktop.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Dave Airlie <airlied@...hat.com>,
	"Nikula, Jani" <jani.nikula@...el.com>
Subject: Re: [Intel-gfx] [drm/i915/3.17] panic in i915_digport_work_func

On Mon, 2014-09-01 at 17:02 +1000, Dave Airlie wrote:
> From: Dave Airlie <airlied@...hat.com>
> Date: Mon, 1 Sep 2014 16:58:12 +1000
> Subject: [PATCH] drm/i915: handle G45/GM45 pulse detection connected
> state.
> 
> In the HPD pulse handler we check for long pulses if the port is
> actually
> connected, however we do that for IBX, but we use the pulse handling
> code on
> GM45 systems as well, so we need to use a diffent check.
> 
> This patch refactors the digital port connected check out of the g4x
> detection
> path and reuses it in the hpd pulse path.
> 
> Should fix:
> Message-ID: <1409382202.5141.36.camel@...ge.simpson.net>
> 
> Reported-by: Mike Galbraith <umgwanakikbuti@...il.com>
> Signed-off-by: Dave Airlie <airlied@...hat.com>

Daniel reviewed this already, but Jani asked me to take a look, so:
Acked-by: Imre Deak <imre.deak@...el.com>

One thing for the future is to move ibx_digital_port_connected() to
intel_dp.c too and make its return value match that of
g4x_digital_port_connected().

--Imre

> ---
>  drivers/gpu/drm/i915/intel_dp.c | 55
> +++++++++++++++++++++++++++--------------
>  1 file changed, 37 insertions(+), 18 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/intel_dp.c
> b/drivers/gpu/drm/i915/intel_dp.c
> index 67cfed6..81d7681 100644
> --- a/drivers/gpu/drm/i915/intel_dp.c
> +++ b/drivers/gpu/drm/i915/intel_dp.c
> @@ -3661,24 +3661,12 @@ ironlake_dp_detect(struct intel_dp *intel_dp)
>         return intel_dp_detect_dpcd(intel_dp);
>  }
>  
> -static enum drm_connector_status
> -g4x_dp_detect(struct intel_dp *intel_dp)
> +static int g4x_digital_port_connected(struct drm_device *dev,
> +                                      struct intel_digital_port
> *intel_dig_port)
>  {
> -       struct drm_device *dev = intel_dp_to_dev(intel_dp);
>         struct drm_i915_private *dev_priv = dev->dev_private;
> -       struct intel_digital_port *intel_dig_port =
> dp_to_dig_port(intel_dp);
>         uint32_t bit;
>  
> -       /* Can't disconnect eDP, but you can close the lid... */
> -       if (is_edp(intel_dp)) {
> -               enum drm_connector_status status;
> -
> -               status = intel_panel_detect(dev);
> -               if (status == connector_status_unknown)
> -                       status = connector_status_connected;
> -               return status;
> -       }
> -
>         if (IS_VALLEYVIEW(dev)) {
>                 switch (intel_dig_port->port) {
>                 case PORT_B:
> @@ -3691,7 +3679,7 @@ g4x_dp_detect(struct intel_dp *intel_dp)
>                         bit = PORTD_HOTPLUG_LIVE_STATUS_VLV;
>                         break;
>                 default:
> -                       return connector_status_unknown;
> +                       return -EINVAL;
>                 }
>         } else {
>                 switch (intel_dig_port->port) {
> @@ -3705,11 +3693,36 @@ g4x_dp_detect(struct intel_dp *intel_dp)
>                         bit = PORTD_HOTPLUG_LIVE_STATUS_G4X;
>                         break;
>                 default:
> -                       return connector_status_unknown;
> +                       return -EINVAL;
>                 }
>         }
>  
>         if ((I915_READ(PORT_HOTPLUG_STAT) & bit) == 0)
> +               return 0;
> +       return 1;
> +}
> +
> +static enum drm_connector_status
> +g4x_dp_detect(struct intel_dp *intel_dp)
> +{
> +       struct drm_device *dev = intel_dp_to_dev(intel_dp);
> +       struct intel_digital_port *intel_dig_port =
> dp_to_dig_port(intel_dp);
> +       int ret;
> +
> +       /* Can't disconnect eDP, but you can close the lid... */
> +       if (is_edp(intel_dp)) {
> +               enum drm_connector_status status;
> +
> +               status = intel_panel_detect(dev);
> +               if (status == connector_status_unknown)
> +                       status = connector_status_connected;
> +               return status;
> +       }
> +
> +       ret = g4x_digital_port_connected(dev, intel_dig_port);
> +       if (ret == -EINVAL)
> +               return connector_status_unknown;
> +       else if (ret == 0)
>                 return connector_status_disconnected;
>  
>         return intel_dp_detect_dpcd(intel_dp);
> @@ -4066,8 +4079,14 @@ intel_dp_hpd_pulse(struct intel_digital_port
> *intel_dig_port, bool long_hpd)
>         intel_display_power_get(dev_priv, power_domain);
>  
>         if (long_hpd) {
> -               if (!ibx_digital_port_connected(dev_priv,
> intel_dig_port))
> -                       goto mst_fail;
> +
> +               if (HAS_PCH_SPLIT(dev)) {
> +                       if (!ibx_digital_port_connected(dev_priv,
> intel_dig_port))
> +                               goto mst_fail;
> +               } else {
> +                       if (g4x_digital_port_connected(dev,
> intel_dig_port) != 1)
> +                               goto mst_fail;
> +               }
>  
>                 if (!intel_dp_get_dpcd(intel_dp)) {
>                         goto mst_fail;


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