diff --git a/drivers/gpu/drm/i915/display/intel_bios.c b/drivers/gpu/drm/i915/display/intel_bios.c index 7118530a1c38..dd51413e7f45 100644 --- a/drivers/gpu/drm/i915/display/intel_bios.c +++ b/drivers/gpu/drm/i915/display/intel_bios.c @@ -2674,6 +2674,23 @@ intel_bios_is_lspcon_present(const struct drm_i915_private *i915, return HAS_LSPCON(i915) && child && child->lspcon; } +/** + * intel_bios_is_lane_reversal_needed - if lane reversal needed on port + * @i915: i915 device instance + * @port: port to check + * + * Return true if port requires lane reversal + */ +bool +intel_bios_is_lane_reversal_needed(const struct drm_i915_private *i915, + enum port port) +{ + const struct child_device_config *child = + i915->vbt.ddi_port_info[port].child; + + return child && child->lane_reversal; +} + enum aux_ch intel_bios_port_aux_ch(struct drm_i915_private *dev_priv, enum port port) { diff --git a/drivers/gpu/drm/i915/display/intel_bios.h b/drivers/gpu/drm/i915/display/intel_bios.h index e29e79faa01b..f25190ecfe97 100644 --- a/drivers/gpu/drm/i915/display/intel_bios.h +++ b/drivers/gpu/drm/i915/display/intel_bios.h @@ -241,6 +241,8 @@ bool intel_bios_is_port_hpd_inverted(const struct drm_i915_private *i915, enum port port); bool intel_bios_is_lspcon_present(const struct drm_i915_private *i915, enum port port); +bool intel_bios_is_lane_reversal_needed(const struct drm_i915_private *i915, + enum port port); enum aux_ch intel_bios_port_aux_ch(struct drm_i915_private *dev_priv, enum port port); bool intel_bios_get_dsc_params(struct intel_encoder *encoder, struct intel_crtc_state *crtc_state, diff --git a/drivers/gpu/drm/i915/display/intel_ddi.c b/drivers/gpu/drm/i915/display/intel_ddi.c index 3c4003605f93..2d6906f6995f 100644 --- a/drivers/gpu/drm/i915/display/intel_ddi.c +++ b/drivers/gpu/drm/i915/display/intel_ddi.c @@ -4082,6 +4082,9 @@ void intel_ddi_init(struct drm_i915_private *dev_priv, enum port port) intel_de_read(dev_priv, DDI_BUF_CTL(port)) & (DDI_BUF_PORT_REVERSAL | DDI_A_4_LANES); + if (intel_bios_is_lane_reversal_needed(dev_priv, port)) + dig_port->saved_port_bits |= DDI_BUF_PORT_REVERSAL; + dig_port->dp.output_reg = INVALID_MMIO_REG; dig_port->max_lanes = intel_ddi_max_lanes(dig_port); dig_port->aux_ch = intel_bios_port_aux_ch(dev_priv, port);