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drm/i915: take display port power domain in DP HPD handler

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Ville noticed that we can call ibx_digital_port_connected() which accesses
the HW without holding any power well/runtime pm reference. Fix this by
holding a display port power domain reference around the whole hpd_pulse
handler.

Signed-off-by: Imre Deak <imre.deak@intel.com>
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Reviewed-by: Dave Airlie <airlied@redhat.com>
Cc: stable@vger.kernel.org (3.16+)
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
This commit is contained in:
Imre Deak 2014-08-18 14:42:42 +03:00 committed by Jani Nikula
parent 1add143caf
commit 1c767b339b
1 changed files with 14 additions and 5 deletions
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19
drivers/gpu/drm/i915/intel_dp.c
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@ -4037,15 +4037,21 @@ bool
intel_dp_hpd_pulse(struct intel_digital_port *intel_dig_port, bool long_hpd)
{
struct intel_dp *intel_dp = &intel_dig_port->dp;
struct intel_encoder *intel_encoder = &intel_dig_port->base;
struct drm_device *dev = intel_dig_port->base.base.dev;
struct drm_i915_private *dev_priv = dev->dev_private;
int ret;
enum intel_display_power_domain power_domain;
bool ret = true;
if (intel_dig_port->base.type != INTEL_OUTPUT_EDP)
intel_dig_port->base.type = INTEL_OUTPUT_DISPLAYPORT;
DRM_DEBUG_KMS("got hpd irq on port %d - %s\n", intel_dig_port->port,
long_hpd ? "long" : "short");
power_domain = intel_display_port_power_domain(intel_encoder);
intel_display_power_get(dev_priv, power_domain);
if (long_hpd) {
if (!ibx_digital_port_connected(dev_priv, intel_dig_port))
goto mst_fail;
@ -4061,8 +4067,7 @@ intel_dp_hpd_pulse(struct intel_digital_port *intel_dig_port, bool long_hpd)
} else {
if (intel_dp->is_mst) {
ret = intel_dp_check_mst_status(intel_dp);
if (ret == -EINVAL)
if (intel_dp_check_mst_status(intel_dp) == -EINVAL)
goto mst_fail;
}
@ -4076,7 +4081,8 @@ intel_dp_hpd_pulse(struct intel_digital_port *intel_dig_port, bool long_hpd)
drm_modeset_unlock(&dev->mode_config.connection_mutex);
}
}
return false;
ret = false;
goto put_power;
mst_fail:
/* if we were in MST mode, and device is not there get out of MST mode */
if (intel_dp->is_mst) {
@ -4084,7 +4090,10 @@ mst_fail:
intel_dp->is_mst = false;
drm_dp_mst_topology_mgr_set_mst(&intel_dp->mst_mgr, intel_dp->is_mst);
}
return true;
put_power:
intel_display_power_put(dev_priv, power_domain);
return ret;
}
/* Return which DP Port should be selected for Transcoder DP control */