[Intel-gfx] [PATCH] drm/i915/bxt: set min brightness from VBT
Lee, Shawn C
shawn.c.lee at intel.com
Tue Sep 12 03:36:30 UTC 2017
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 <jani.nikula at intel.com>
Cc: Cooper Chiou <cooper.chiou at intel.com>
Cc: Gary C Wang <gary.c.wang at intel.com>
Signed-off-by: Shawn Lee <shawn.c.lee at intel.com>
---
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,
--
2.7.4
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