diff options
Diffstat (limited to 'drivers/gpu/drm/i915/display/intel_dp.c')
| -rw-r--r-- | drivers/gpu/drm/i915/display/intel_dp.c | 28 |
1 files changed, 22 insertions, 6 deletions
diff --git a/drivers/gpu/drm/i915/display/intel_dp.c b/drivers/gpu/drm/i915/display/intel_dp.c index 2c1034578984..2852958dd4e7 100644 --- a/drivers/gpu/drm/i915/display/intel_dp.c +++ b/drivers/gpu/drm/i915/display/intel_dp.c @@ -6037,8 +6037,7 @@ static bool intel_edp_init_connector(struct intel_dp *intel_dp, * (eg. Acer Chromebook C710), so we'll check it only if multiple * ports are attempting to use the same AUX CH, according to VBT. */ - if (intel_bios_dp_has_shared_aux_ch(encoder->devdata) && - !intel_digital_port_connected(encoder)) { + if (intel_bios_dp_has_shared_aux_ch(encoder->devdata)) { /* * If this fails, presume the DPCD answer came * from some other port using the same AUX CH. @@ -6046,10 +6045,27 @@ static bool intel_edp_init_connector(struct intel_dp *intel_dp, * FIXME maybe cleaner to check this before the * DPCD read? Would need sort out the VDD handling... */ - drm_info(&dev_priv->drm, - "[ENCODER:%d:%s] HPD is down, disabling eDP\n", - encoder->base.base.id, encoder->base.name); - goto out_vdd_off; + if (!intel_digital_port_connected(encoder)) { + drm_info(&dev_priv->drm, + "[ENCODER:%d:%s] HPD is down, disabling eDP\n", + encoder->base.base.id, encoder->base.name); + goto out_vdd_off; + } + + /* + * Unfortunately even the HPD based detection fails on + * eg. Asus B360M-A (CFL+CNP), so as a last resort fall + * back to checking for a VGA branch device. Only do this + * on known affected platforms to minimize false positives. + */ + if (DISPLAY_VER(dev_priv) == 9 && drm_dp_is_branch(intel_dp->dpcd) && + (intel_dp->dpcd[DP_DOWNSTREAMPORT_PRESENT] & DP_DWN_STRM_PORT_TYPE_MASK) == + DP_DWN_STRM_PORT_TYPE_ANALOG) { + drm_info(&dev_priv->drm, + "[ENCODER:%d:%s] VGA converter detected, disabling eDP\n", + encoder->base.base.id, encoder->base.name); + goto out_vdd_off; + } } mutex_lock(&dev_priv->drm.mode_config.mutex); |