From 1c767b339b3938b19076ffdc9d70aa1e4235a45b Mon Sep 17 00:00:00 2001 From: Imre Deak Date: Mon, 18 Aug 2014 14:42:42 +0300 Subject: [PATCH] drm/i915: take display port power domain in DP HPD handler MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit 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 Reviewed-by: Ville Syrjälä Reviewed-by: Dave Airlie Cc: stable@vger.kernel.org (3.16+) Signed-off-by: Jani Nikula --- drivers/gpu/drm/i915/intel_dp.c | 19 ++++++++++++++----- 1 file changed, 14 insertions(+), 5 deletions(-) diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c index ee3942f0b068..a520188e6d97 100644 --- a/drivers/gpu/drm/i915/intel_dp.c +++ b/drivers/gpu/drm/i915/intel_dp.c @@ -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 */ -- 2.20.1