This reverts commit ae25eceab616d16a07bcaa434b84463d58a3bdc3.
The introduction of dynamic backlight control causes
Lenovo ThinkPad X1 Carbon 4th Gen to boot to a black screen;
presumably the backlight is off.
Signed-off-by: David Weinehall <david.weinehall@xxxxxxxxxxxxxxx>
---
drivers/gpu/drm/i915/i915_params.c | 5 -----
drivers/gpu/drm/i915/i915_params.h | 3 +--
drivers/gpu/drm/i915/intel_dp_aux_backlight.c | 26 --------------------------
3 files changed, 1 insertion(+), 33 deletions(-)
diff --git a/drivers/gpu/drm/i915/i915_params.c b/drivers/gpu/drm/i915/i915_params.c
index 88b9d3e6713a..5b5ab15d191f 100644
--- a/drivers/gpu/drm/i915/i915_params.c
+++ b/drivers/gpu/drm/i915/i915_params.c
@@ -65,7 +65,6 @@ 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);
@@ -255,7 +254,3 @@ 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)");
diff --git a/drivers/gpu/drm/i915/i915_params.h b/drivers/gpu/drm/i915/i915_params.h
index 057e203e6bda..0d6cf9138dc4 100644
--- a/drivers/gpu/drm/i915/i915_params.h
+++ b/drivers/gpu/drm/i915/i915_params.h
@@ -67,8 +67,7 @@
func(bool, verbose_state_checks); \
func(bool, nuclear_pageflip); \
func(bool, enable_dp_mst); \
- func(bool, enable_gvt); \
- func(bool, enable_dbc)
+ func(bool, enable_gvt)
#define MEMBER(T, member) T member
struct i915_params {
diff --git a/drivers/gpu/drm/i915/intel_dp_aux_backlight.c b/drivers/gpu/drm/i915/intel_dp_aux_backlight.c
index b25cd88fc1c5..fea161727c6e 100644
--- a/drivers/gpu/drm/i915/intel_dp_aux_backlight.c
+++ b/drivers/gpu/drm/i915/intel_dp_aux_backlight.c
@@ -173,24 +173,6 @@ static bool intel_dp_aux_set_pwm_freq(struct intel_connector *connector)
return true;
}
-/*
-* Set minimum / maximum dynamic brightness percentage. This value is expressed
-* as the percentage of normal brightness in 5% increments.
-*/
-static bool
-intel_dp_aux_set_dynamic_backlight_percent(struct intel_dp *intel_dp,
- u32 min, u32 max)
-{
- u8 dbc[] = { DIV_ROUND_CLOSEST(min, 5), DIV_ROUND_CLOSEST(max, 5) };
-
- if (drm_dp_dpcd_write(&intel_dp->aux, DP_EDP_DBC_MINIMUM_BRIGHTNESS_SET,
- dbc, sizeof(dbc)) < 0) {
- DRM_DEBUG_KMS("Failed to write aux DBC brightness level\n");
- return false;
- }
- return true;
-}
-
static void intel_dp_aux_enable_backlight(const struct intel_crtc_state *crtc_state,
const struct drm_connector_state *conn_state)
{
@@ -226,14 +208,6 @@ static void intel_dp_aux_enable_backlight(const struct intel_crtc_state *crtc_st
if (intel_dp_aux_set_pwm_freq(connector))
new_dpcd_buf |= DP_EDP_BACKLIGHT_FREQ_AUX_SET_ENABLE;
- if (i915.enable_dbc &&
- (intel_dp->edp_dpcd[2] & DP_EDP_DYNAMIC_BACKLIGHT_CAP)) {
- if(intel_dp_aux_set_dynamic_backlight_percent(intel_dp, 0, 100)) {
- new_dpcd_buf |= DP_EDP_DYNAMIC_BACKLIGHT_ENABLE;
- DRM_DEBUG_KMS("Enable dynamic brightness.\n");
- }
- }
-
if (new_dpcd_buf != dpcd_buf) {
if (drm_dp_dpcd_writeb(&intel_dp->aux,
DP_EDP_BACKLIGHT_MODE_SET_REGISTER, new_dpcd_buf) < 0) {
--
2.13.2
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