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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
(cherry picked from commit f44e354f85)
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
This commit is contained in:
Lee, Shawn C 2017-09-13 13:19:20 +08:00 committed by Rodrigo Vivi
parent abeae421b0
commit 8c7a758873
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) 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,