From: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx> We don't parse the VBT vswing/preemphassis tables at all currently. Let's WARN if a port wants to use them so we get a heads up that whether we really need to implement this stuff or not. My current stash contains no VBTs with this bit set. v2: Move to print_ddi_port() (Jani) Reviewed-by: Rodrigo Vivi <rodrigo.vivi@xxxxxxxxx> Signed-off-by: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx> --- drivers/gpu/drm/i915/display/intel_bios.c | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/drivers/gpu/drm/i915/display/intel_bios.c b/drivers/gpu/drm/i915/display/intel_bios.c index 28bdb936cd1f..4c543e8205ca 100644 --- a/drivers/gpu/drm/i915/display/intel_bios.c +++ b/drivers/gpu/drm/i915/display/intel_bios.c @@ -2676,6 +2676,14 @@ static void print_ddi_port(const struct intel_bios_encoder_data *devdata, drm_dbg_kms(&i915->drm, "Port %c VBT DP max link rate: %d\n", port_name(port), dp_max_link_rate); + + /* + * FIXME need to implement support for VBT + * vswing/preemph tables should this ever trigger. + */ + drm_WARN(&i915->drm, child->use_vbt_vswing, + "Port %c asks to use VBT vswing/preemph tables\n", + port_name(port)); } static void parse_ddi_port(struct intel_bios_encoder_data *devdata) -- 2.35.1
