From ac73661c6222faef1a97ec44f424234f165e4710 Mon Sep 17 00:00:00 2001 From: "Lee, Shawn C" Date: Tue, 12 Sep 2017 11:36:30 +0800 Subject: [PATCH] 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: 0fb890c01349 ("drm/i915/bxt: BLC implementation") Cc: Jani Nikula Cc: Cooper Chiou Cc: Gary C Wang Signed-off-by: Shawn Lee Signed-off-by: Jani Nikula Link: https://patchwork.freedesktop.org/patch/msgid/1505187390-7039-1-git-send-email-shawn.c.lee@intel.com (cherry picked from commit c3881128cb672cf484a52fbb36b5daa9044d9168) Signed-off-by: Rodrigo Vivi --- drivers/gpu/drm/i915/intel_panel.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/drivers/gpu/drm/i915/intel_panel.c b/drivers/gpu/drm/i915/intel_panel.c index a17b1de7d7e0..d4dd248ac9a8 100644 --- a/drivers/gpu/drm/i915/intel_panel.c +++ b/drivers/gpu/drm/i915/intel_panel.c @@ -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, -- 2.45.2