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authorLee, Shawn C <shawn.c.lee@intel.com>2017-09-13 13:19:20 +0800
committerRodrigo Vivi <rodrigo.vivi@intel.com>2017-09-18 15:22:33 -0700
commit8c7a758873577f0d1bb3f879584338f73e6c6bc3 (patch)
tree15072d84a507f453a1a2130d8afe629e253510cc /drivers
parentabeae421b03d800d33894df7fbca6d00c70c358e (diff)
downloadlinux-8c7a758873577f0d1bb3f879584338f73e6c6bc3.tar.bz2
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: 4c9f7086ac6d ("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 f44e354f857f207cd361269c5e38e1f96e0b616c) Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/gpu/drm/i915/intel_panel.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/drivers/gpu/drm/i915/intel_panel.c b/drivers/gpu/drm/i915/intel_panel.c
index d4dd248ac9a8..3b1c5d783ee7 100644
--- a/drivers/gpu/drm/i915/intel_panel.c
+++ b/drivers/gpu/drm/i915/intel_panel.c
@@ -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,