From add033793c9efa7b0a8ecd2fa192fe85aa8b0854 Mon Sep 17 00:00:00 2001 From: Vidya Srinivas Date: Thu, 8 Dec 2016 11:26:18 +0200 Subject: [PATCH] drm/i915: Parse panel backlight controller from VBT Currently the backlight controller is taken as 0. It needs to derive value from the VBT. Adding the necessary changes. v2 by Jani: - drop obsolete comments, drop redundant initialization (Bob) - merge debug logging into one Signed-off-by: Uma Shankar Signed-off-by: Vidya Srinivas Reviewed-by: Bob Paauwe Tested-by: Bob Paauwe Tested-by: Mika Kahola Signed-off-by: Jani Nikula Link: http://patchwork.freedesktop.org/patch/msgid/1481189178-426-1-git-send-email-jani.nikula@intel.com --- drivers/gpu/drm/i915/i915_drv.h | 1 + drivers/gpu/drm/i915/intel_bios.c | 6 ++++-- drivers/gpu/drm/i915/intel_panel.c | 17 +++-------------- 3 files changed, 8 insertions(+), 16 deletions(-) diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h index 40c55c9c9eb4..20bc04d5e617 100644 --- a/drivers/gpu/drm/i915/i915_drv.h +++ b/drivers/gpu/drm/i915/i915_drv.h @@ -1716,6 +1716,7 @@ struct intel_vbt_data { bool present; bool active_low_pwm; u8 min_brightness; /* min_brightness/255 of max */ + u8 controller; /* brightness controller number */ enum intel_backlight_type type; } backlight; diff --git a/drivers/gpu/drm/i915/intel_bios.c b/drivers/gpu/drm/i915/intel_bios.c index eaade27af386..1cf2fa6ec28f 100644 --- a/drivers/gpu/drm/i915/intel_bios.c +++ b/drivers/gpu/drm/i915/intel_bios.c @@ -330,17 +330,19 @@ parse_lfp_backlight(struct drm_i915_private *dev_priv, method = &backlight_data->backlight_control[panel_type]; dev_priv->vbt.backlight.type = method->type; + dev_priv->vbt.backlight.controller = method->controller; } dev_priv->vbt.backlight.pwm_freq_hz = entry->pwm_freq_hz; dev_priv->vbt.backlight.active_low_pwm = entry->active_low_pwm; dev_priv->vbt.backlight.min_brightness = entry->min_brightness; DRM_DEBUG_KMS("VBT backlight PWM modulation frequency %u Hz, " - "active %s, min brightness %u, level %u\n", + "active %s, min brightness %u, level %u, controller %u\n", dev_priv->vbt.backlight.pwm_freq_hz, dev_priv->vbt.backlight.active_low_pwm ? "low" : "high", dev_priv->vbt.backlight.min_brightness, - backlight_data->level[panel_type]); + backlight_data->level[panel_type], + dev_priv->vbt.backlight.controller); } /* Try to find sdvo panel data */ diff --git a/drivers/gpu/drm/i915/intel_panel.c b/drivers/gpu/drm/i915/intel_panel.c index 3578b402d412..b01edceac650 100644 --- a/drivers/gpu/drm/i915/intel_panel.c +++ b/drivers/gpu/drm/i915/intel_panel.c @@ -1039,10 +1039,7 @@ static void bxt_enable_backlight(struct intel_connector *connector) enum pipe pipe = intel_get_pipe_from_connector(connector); u32 pwm_ctl, val; - /* To use 2nd set of backlight registers, utility pin has to be - * enabled with PWM mode. - * The field should only be changed when the utility pin is disabled - */ + /* Controller 1 uses the utility pin. */ if (panel->backlight.controller == 1) { val = I915_READ(UTIL_PIN_CTL); if (val & UTIL_PIN_ENABLE) { @@ -1608,19 +1605,11 @@ bxt_setup_backlight(struct intel_connector *connector, enum pipe unused) struct intel_panel *panel = &connector->panel; u32 pwm_ctl, val; - /* - * For BXT hard coding the Backlight controller to 0. - * TODO : Read the controller value from VBT and generalize - */ - panel->backlight.controller = 0; + panel->backlight.controller = dev_priv->vbt.backlight.controller; pwm_ctl = I915_READ(BXT_BLC_PWM_CTL(panel->backlight.controller)); - /* Keeping the check if controller 1 is to be programmed. - * This will come into affect once the VBT parsing - * is fixed for controller selection, and controller 1 is used - * for a prticular display configuration. - */ + /* Controller 1 uses the utility pin. */ if (panel->backlight.controller == 1) { val = I915_READ(UTIL_PIN_CTL); panel->backlight.util_pin_active_low = -- 2.20.1