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drm/i915: Parse LFP brightness control field in VBT

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These fields in VBT indicates the PWM source which
is used and also the controller number.

v2 by Jani: check for out of bounds access, some renames, change default
type, etc.

v3 by Jani: s/INTEL_BACKLIGHT_CABC/INTEL_BACKLIGHT_DSI_DCS/

Signed-off-by: Deepak M <m.deepak@intel.com>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/eee2f7b683a081f006a7df1ddad9b20fbf53c48c.1461676337.git.jani.nikula@intel.com
This commit is contained in:
Deepak M
2016-04-26 16:14:24 +03:00
committed by Jani Nikula
parent ea9d9768a4
commit 9a41e17de3
4 changed files with 24 additions and 0 deletions
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9
drivers/gpu/drm/i915/intel_bios.c
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@@ -318,6 +318,15 @@ parse_lfp_backlight(struct drm_i915_private *dev_priv,
return;
}
dev_priv->vbt.backlight.type = INTEL_BACKLIGHT_DISPLAY_DDI;
if (bdb->version >= 191 &&
get_blocksize(backlight_data) >= sizeof(*backlight_data)) {
const struct bdb_lfp_backlight_control_method *method;
method = &backlight_data->backlight_control[panel_type];
dev_priv->vbt.backlight.type = method->type;
}
dev_priv->vbt.backlight.pwm_freq_hz = entry->pwm_freq_hz;
dev_priv->vbt.backlight.active_low_pwm = entry->active_low_pwm;
dev_priv->vbt.backlight.min_brightness = entry->min_brightness;