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Date: Mon, 01 Sep 2014 17:11:55 +0300
From: Jani Nikula <jani.nikula@...el.com>
To: imre.deak@...el.com, 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>
Subject: Re: [Intel-gfx] [drm/i915/3.17] panic in i915_digport_work_func
On Mon, 01 Sep 2014, Imre Deak <imre.deak@...el.com> wrote:
> 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>
Pushed to drm-intel-fixes, thanks for the patch, review, and testing.
BR,
Jani.
>
> 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;
>
--
Jani Nikula, Intel Open Source Technology Center
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