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.
Signed-off-by: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
---
drivers/gpu/drm/i915/display/intel_bios.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/drivers/gpu/drm/i915/display/intel_bios.c b/drivers/gpu/drm/i915/display/intel_bios.c
index 51dde5bfd956..cd86b65055ef 100644
--- a/drivers/gpu/drm/i915/display/intel_bios.c
+++ b/drivers/gpu/drm/i915/display/intel_bios.c
@@ -2661,6 +2661,10 @@ static void parse_ddi_port(struct intel_bios_encoder_data *devdata)
return;
}
+ drm_WARN(&i915->drm, child->use_vbt_vswing,
+ "Port %c asks to use VBT vswing/preemph tables\n",
+ port_name(port));
+
if (i915->vbt.ports[port]) {
drm_dbg_kms(&i915->drm,
"More than one child device for port %c in VBT, using the first.\n",
--
2.35.1
