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authorLee, Shawn C <[email protected]>2017-09-13 13:19:20 +0800
committerJani Nikula <[email protected]>2017-09-13 10:57:05 +0300
commitf44e354f857f207cd361269c5e38e1f96e0b616c (patch)
treebee6e96df94171d7ff6269c7350f970c69aec7b9
parent33c8d8870c67faf3161898a56af98ac3c1c71450 (diff)
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 <[email protected]> Signed-off-by: Shawn Lee <[email protected]> Signed-off-by: Jani Nikula <[email protected]> Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]
-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,