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drm/i915: Add option to support dynamic backlight via DPCD

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This patch adds option to enable dynamic backlight for eDP
panel that supports this feature via DPCD register and
set minimum / maximum brightness to 0% and 100% of the
normal brightness.

Signed-off-by: Puthikorn Voravootivat <puthik@chromium.org>
Reviewed-by: Dhinakaran Pandiyan <dhinakaran.pandiyan@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: http://patchwork.freedesktop.org/patch/msgid/20170622190339.142671-4-puthik@chromium.org
This commit is contained in:
Puthikorn Voravootivat
2017-06-22 12:03:39 -07:00
committed by Daniel Vetter
parent 560a758d39
commit ae25eceab6
3 changed files with 33 additions and 1 deletions
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5
drivers/gpu/drm/i915/i915_params.c
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@@ -65,6 +65,7 @@ struct i915_params i915 __read_mostly = {
.inject_load_failure = 0,
.enable_dpcd_backlight = -1,
.enable_gvt = false,
.enable_dbc = true,
};
module_param_named(modeset, i915.modeset, int, 0400);
@@ -254,3 +255,7 @@ MODULE_PARM_DESC(enable_dpcd_backlight,
module_param_named(enable_gvt, i915.enable_gvt, bool, 0400);
MODULE_PARM_DESC(enable_gvt,
"Enable support for Intel GVT-g graphics virtualization host support(default:false)");
module_param_named_unsafe(enable_dbc, i915.enable_dbc, bool, 0600);
MODULE_PARM_DESC(enable_dbc,
"Enable support for dynamic backlight control (default:true)");