From: Deepak M <m.deepak@xxxxxxxxx> LFP brighness control from the VBT block 43 indicates which controller is used for brightness. LFP1 brightness control method: Bit 7-4 = This field controller number of the brightnes controller. 0 = Controller 0 1 = Controller 1 2 = Controller 2 3 = Controller 3 Others = Reserved Bits 3-0 are for Control pin 0 = PMIC pin is used for brightness control 1 = LPSS PWM is used for brightness control 2 = Display DDI is used for brightness control 3 = CABC method to control brightness Others = Reserved History: This patch was submitted earlier including a check for control pin. http://lists.freedesktop.org/archives/intel-gfx/2014-December/057530.html Since it caused the issue, https://bugs.freedesktop.org/show_bug.cgi?id=87671, it was reverted in http://lists.freedesktop.org/archives/intel-gfx/2015-January/058110.html The current patch reads controller and control pin from VBT (version >= 191) >From VBT version >= 197, default value of control pin is set to DDI, so the corresponding check during backlight setup will be made in a future patch Signed-off-by: Deepak M <m.deepak@xxxxxxxxx> Signed-off-by: Vandana Kannan <vandana.kannan@xxxxxxxxx> Cc: Jani Nikula <jani.nikula@xxxxxxxxx> --- drivers/gpu/drm/i915/i915_drv.h | 2 ++ drivers/gpu/drm/i915/intel_bios.c | 9 +++++++++ drivers/gpu/drm/i915/intel_bios.h | 11 +++++++++++ 3 files changed, 22 insertions(+) diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h index 950a981..a89e9a9 100644 --- a/drivers/gpu/drm/i915/i915_drv.h +++ b/drivers/gpu/drm/i915/i915_drv.h @@ -1461,6 +1461,8 @@ struct intel_vbt_data { bool present; bool active_low_pwm; u8 min_brightness; /* min_brightness/255 of max */ + u8 controller; /* brightness controller number */ + u8 control_pin; /* brightness control pin */ } backlight; /* MIPI DSI */ diff --git a/drivers/gpu/drm/i915/intel_bios.c b/drivers/gpu/drm/i915/intel_bios.c index 2ff9eb0..32c1ef2 100644 --- a/drivers/gpu/drm/i915/intel_bios.c +++ b/drivers/gpu/drm/i915/intel_bios.c @@ -256,6 +256,7 @@ parse_lfp_backlight(struct drm_i915_private *dev_priv, { const struct bdb_lfp_backlight_data *backlight_data; const struct bdb_lfp_backlight_data_entry *entry; + const struct bdb_lfp_backlight_control_data *bl_ctrl_data; backlight_data = find_section(bdb, BDB_LVDS_BACKLIGHT); if (!backlight_data) @@ -268,6 +269,7 @@ parse_lfp_backlight(struct drm_i915_private *dev_priv, } entry = &backlight_data->data[panel_type]; + bl_ctrl_data = &backlight_data->blc_ctl[panel_type]; dev_priv->vbt.backlight.present = entry->type == BDB_BACKLIGHT_TYPE_PWM; if (!dev_priv->vbt.backlight.present) { @@ -279,12 +281,19 @@ parse_lfp_backlight(struct drm_i915_private *dev_priv, 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; + dev_priv->vbt.backlight.controller = bl_ctrl_data->controller; + dev_priv->vbt.backlight.control_pin = bl_ctrl_data->pin; + DRM_DEBUG_KMS("VBT backlight PWM modulation frequency %u Hz, " "active %s, min brightness %u, level %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]); + + DRM_DEBUG_KMS("VBT BL controller %u, BL control pin %u\n", + dev_priv->vbt.backlight.controller, + dev_priv->vbt.backlight.control_pin); } /* Try to find sdvo panel data */ diff --git a/drivers/gpu/drm/i915/intel_bios.h b/drivers/gpu/drm/i915/intel_bios.h index af0b476..e97c1c0 100644 --- a/drivers/gpu/drm/i915/intel_bios.h +++ b/drivers/gpu/drm/i915/intel_bios.h @@ -402,10 +402,21 @@ struct bdb_lfp_backlight_data_entry { u8 obsolete3; } __packed; +#define BLC_CONTROL_PIN_PMIC 0 +#define BLC_CONTROL_PIN_LPSS_PWM 1 +#define BLC_CONTROL_PIN_DDI 2 +#define BLC_CONTROL_PIN_CABC 3 + +struct bdb_lfp_backlight_control_data { + u8 controller:4; + u8 pin:4; +} __packed; + struct bdb_lfp_backlight_data { u8 entry_size; struct bdb_lfp_backlight_data_entry data[16]; u8 level[16]; + struct bdb_lfp_backlight_control_data blc_ctl[16]; } __packed; struct aimdb_header { -- 2.0.1 _______________________________________________ Intel-gfx mailing list Intel-gfx@xxxxxxxxxxxxxxxxxxxxx http://lists.freedesktop.org/mailman/listinfo/intel-gfx
