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drm/i915/bxt: set min brightness from VBT

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Min brightness value from vbt was missing for BXT platform.
This setting have to refer backlight ic spec to restrict
min backlight output. Without this restriction, driver would
allow to configure lower brightness value and violate
backlight ic requirement.

Fixes: 0fb890c013 ("drm/i915/bxt: BLC implementation")
Cc: Jani Nikula <jani.nikula@intel.com>
Cc: Cooper Chiou <cooper.chiou@intel.com>
Cc: Gary C Wang <gary.c.wang@intel.com>
Signed-off-by: Shawn Lee <shawn.c.lee@intel.com>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/1505187390-7039-1-git-send-email-shawn.c.lee@intel.com
This commit is contained in:
Lee, Shawn C 2017-09-12 11:36:30 +08:00 committed by Jani Nikula
parent 3164888a40
commit c3881128cb
1 changed files with 2 additions and 0 deletions
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2
drivers/gpu/drm/i915/intel_panel.c
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@ -1699,6 +1699,8 @@ bxt_setup_backlight(struct intel_connector *connector, enum pipe unused)
if (!panel->backlight.max)
return -ENODEV;
panel->backlight.min = get_backlight_min_vbt(connector);
val = bxt_get_backlight(connector);
val = intel_panel_compute_brightness(connector, val);
panel->backlight.level = clamp(val, panel->backlight.min,