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

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
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

5
drivers/gpu/drm/i915/i915_params.c
View File

@ -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)");

3
drivers/gpu/drm/i915/i915_params.h
View File

@ -67,7 +67,8 @@
func(bool, verbose_state_checks); \
func(bool, nuclear_pageflip); \
func(bool, enable_dp_mst); \
func(bool, enable_gvt)
func(bool, enable_gvt); \
func(bool, enable_dbc)
#define MEMBER(T, member) T member
struct i915_params {

26
drivers/gpu/drm/i915/intel_dp_aux_backlight.c
View File

@ -173,6 +173,24 @@ 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)
{
@ -208,6 +226,14 @@ 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) {