drm/i915/mtl: Skip using vbt hdmi_level_shifter selection on MTL

The hdmi_level_shifter part of General Bytes definition in VBT, which was used for choosing different levels on earlier platforms is now a hidden optin and shows the default value of 0. The level shifter is now to be deduced from hdmi_default_entry in intel_ddi_buf_trans for each phy. Skip providing the default hw provided value to force driver to choose hdmi default entry. Bspec: 20124 Cc: Khaled Almahallawy <[email protected]> Cc: Lee Shawn C <[email protected]> Cc: Clint Taylor <[email protected]> Signed-off-by: Radhakrishna Sripada <[email protected]> Reviewed-by: Clint Taylor <[email protected]> Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]
wafgo · Jun 20, 2023 · d9c078d · d9c078d
1 parent 7e8d87e
commit d9c078d
Showing 1 changed file with 2 additions and 1 deletion.
diff --git a/drivers/gpu/drm/i915/display/intel_bios.c b/drivers/gpu/drm/i915/display/intel_bios.c
@@ -2615,7 +2615,8 @@ intel_bios_encoder_is_lspcon(const struct intel_bios_encoder_data *devdata)
 /* This is an index in the HDMI/DVI DDI buffer translation table, or -1 */
 int intel_bios_hdmi_level_shift(const struct intel_bios_encoder_data *devdata)
 {
-	if (!devdata || devdata->i915->display.vbt.version < 158)
+	if (!devdata || devdata->i915->display.vbt.version < 158 ||
+	    DISPLAY_VER(devdata->i915) >= 14)
 		return -1;
 
 	return devdata->child.hdmi_level_shifter_value;