diff options
Diffstat (limited to 'drivers/gpu/drm/i915/intel_bios.c')
| -rw-r--r-- | drivers/gpu/drm/i915/intel_bios.c | 29 |
1 files changed, 29 insertions, 0 deletions
diff --git a/drivers/gpu/drm/i915/intel_bios.c b/drivers/gpu/drm/i915/intel_bios.c index f88e5079a3f5..f22041973f3a 100644 --- a/drivers/gpu/drm/i915/intel_bios.c +++ b/drivers/gpu/drm/i915/intel_bios.c @@ -281,6 +281,34 @@ parse_lfp_panel_data(struct drm_i915_private *dev_priv, } } +static void +parse_lfp_backlight(struct drm_i915_private *dev_priv, struct bdb_header *bdb) +{ + const struct bdb_lfp_backlight_data *backlight_data; + const struct bdb_lfp_backlight_data_entry *entry; + + backlight_data = find_section(bdb, BDB_LVDS_BACKLIGHT); + if (!backlight_data) + return; + + if (backlight_data->entry_size != sizeof(backlight_data->data[0])) { + DRM_DEBUG_KMS("Unsupported backlight data entry size %u\n", + backlight_data->entry_size); + return; + } + + entry = &backlight_data->data[panel_type]; + + dev_priv->vbt.backlight.pwm_freq_hz = entry->pwm_freq_hz; + dev_priv->vbt.backlight.active_low_pwm = entry->active_low_pwm; + DRM_DEBUG_KMS("VBT backlight PWM modulation frequency %u Hz, " + "active %s, min brightness %u, level %u\n", + dev_priv->vbt.backlight.pwm_freq_hz, + dev_priv->vbt.backlight.active_low_pwm ? "low" : "high", + entry->min_brightness, + backlight_data->level[panel_type]); +} + /* Try to find sdvo panel data */ static void parse_sdvo_panel_data(struct drm_i915_private *dev_priv, @@ -894,6 +922,7 @@ intel_parse_bios(struct drm_device *dev) parse_general_features(dev_priv, bdb); parse_general_definitions(dev_priv, bdb); parse_lfp_panel_data(dev_priv, bdb); + parse_lfp_backlight(dev_priv, bdb); parse_sdvo_panel_data(dev_priv, bdb); parse_sdvo_device_mapping(dev_priv, bdb); parse_device_mapping(dev_priv, bdb); |