We can't safely probe Type C ports, whether they are a legacy or a USB/Thunderbolt DP Alternate Type C port. This would require performing the TypeC connect sequence - as described by the specification - but that may have unwanted side-effects. These side-effects include at least - without completeness - timeouts during AUX power well enabling and subsequent PLL enabling errors.
To safely identify these ports we really need VBT, which has the proper flag for this (ddi_vbt_port_info::supports_typec_usb, supports_tbt). Based on the above disable Type C ports if we can't load VBT for some reason. v2: - Notice that we disable TypeC ports completely and simplify accordingly (Jose). - Add code comment explaining why we disabled the ports. (Jani) Cc: Jani Nikula <[email protected]> Cc: Paulo Zanoni <[email protected]> Cc: Jose Roberto de Souza <[email protected]> Cc: Ville Syrjälä <[email protected]> Cc: Rodrigo Vivi <[email protected]> Signed-off-by: Imre Deak <[email protected]> --- drivers/gpu/drm/i915/intel_bios.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/drivers/gpu/drm/i915/intel_bios.c b/drivers/gpu/drm/i915/intel_bios.c index 561a4f9f044c..b508d8a735e0 100644 --- a/drivers/gpu/drm/i915/intel_bios.c +++ b/drivers/gpu/drm/i915/intel_bios.c @@ -1663,6 +1663,13 @@ init_vbt_missing_defaults(struct drm_i915_private *dev_priv) struct ddi_vbt_port_info *info = &dev_priv->vbt.ddi_port_info[port]; + /* + * VBT has the TypeC mode (native,TBT/USB) and we don't want + * to detect it. + */ + if (intel_port_is_tc(dev_priv, port)) + continue; + info->supports_dvi = (port != PORT_A && port != PORT_E); info->supports_hdmi = info->supports_dvi; info->supports_dp = (port != PORT_E); -- 2.13.2 _______________________________________________ Intel-gfx mailing list [email protected] https://lists.freedesktop.org/mailman/listinfo/intel-gfx
