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drm/i915/cnp: set min brightness from VBT 

Min brightness value from vbt was missing for CNP 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: 4c9f7086ac ("drm/i915/cnp: Backlight support for CNP.")
Cc: Jani Nikula <jani.nikula@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/1505279961-16140-1-git-send-email-shawn.c.lee@intel.com
This commit is contained in:
Lee, Shawn C 2017-09-13 13:19:20 +08:00 committed by Jani Nikula
parent 33c8d8870c
commit f44e354f85
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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@ -1737,6 +1737,8 @@ cnp_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,