Commit ac73661c authored by Lee, Shawn C's avatar Lee, Shawn C Committed by Rodrigo Vivi

drm/i915/bxt: set min brightness from VBT

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: 0fb890c0 ("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: default avatarShawn Lee <shawn.c.lee@intel.com>
Signed-off-by: default avatarJani Nikula <jani.nikula@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/1505187390-7039-1-git-send-email-shawn.c.lee@intel.com
(cherry picked from commit c3881128)
Signed-off-by: default avatarRodrigo Vivi <rodrigo.vivi@intel.com>
parent 814feed3
...@@ -1699,6 +1699,8 @@ bxt_setup_backlight(struct intel_connector *connector, enum pipe unused) ...@@ -1699,6 +1699,8 @@ bxt_setup_backlight(struct intel_connector *connector, enum pipe unused)
if (!panel->backlight.max) if (!panel->backlight.max)
return -ENODEV; return -ENODEV;
panel->backlight.min = get_backlight_min_vbt(connector);
val = bxt_get_backlight(connector); val = bxt_get_backlight(connector);
val = intel_panel_compute_brightness(connector, val); val = intel_panel_compute_brightness(connector, val);
panel->backlight.level = clamp(val, panel->backlight.min, panel->backlight.level = clamp(val, panel->backlight.min,
......
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