diff options
| -rw-r--r-- | drivers/gpu/drm/i915/display/intel_bios.c | 22 |
1 files changed, 22 insertions, 0 deletions
diff --git a/drivers/gpu/drm/i915/display/intel_bios.c b/drivers/gpu/drm/i915/display/intel_bios.c index 69db1a3a1499..719fb550342b 100644 --- a/drivers/gpu/drm/i915/display/intel_bios.c +++ b/drivers/gpu/drm/i915/display/intel_bios.c @@ -2473,6 +2473,27 @@ static void sanitize_device_type(struct intel_bios_encoder_data *devdata, devdata->child.device_type |= DEVICE_TYPE_NOT_HDMI_OUTPUT; } +static void sanitize_hdmi_level_shift(struct intel_bios_encoder_data *devdata, + enum port port) +{ + struct drm_i915_private *i915 = devdata->i915; + + if (!intel_bios_encoder_supports_dvi(devdata)) + return; + + /* + * Some BDW machines (eg. HP Pavilion 15-ab) shipped + * with a HSW VBT where the level shifter value goes + * up to 11, whereas the BDW max is 9. + */ + if (IS_BROADWELL(i915) && devdata->child.hdmi_level_shifter_value > 9) { + drm_dbg_kms(&i915->drm, "Bogus port %c VBT HDMI level shift %d, adjusting to %d\n", + port_name(port), devdata->child.hdmi_level_shifter_value, 9); + + devdata->child.hdmi_level_shifter_value = 9; + } +} + static bool intel_bios_encoder_supports_crt(const struct intel_bios_encoder_data *devdata) { @@ -2652,6 +2673,7 @@ static void parse_ddi_port(struct intel_bios_encoder_data *devdata) } sanitize_device_type(devdata, port); + sanitize_hdmi_level_shift(devdata, port); } static bool has_ddi_port_info(struct drm_i915_private *i915) |