These fields in VBT indicates the PWM source which
is used and also the controller number.
Signed-off-by: Deepak M <m.dee...@intel.com>
---
drivers/gpu/drm/i915/i915_drv.h | 2 ++
drivers/gpu/drm/i915/intel_bios.c | 12 ++++++++++++
drivers/gpu/drm/i915/intel_drv.h | 5 +++++
drivers/gpu/drm/i915/intel_vbt_defs.h | 6 ++++++
4 files changed, 25 insertions(+)
diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index 050d860..30321e6 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -1488,6 +1488,8 @@ struct intel_vbt_data {
bool present;
bool active_low_pwm;
u8 min_brightness; /* min_brightness/255 of max */
+ u8 pwm_pin; /* Source of PWM */
+ u8 pwm_controller; /* Controller used in particular PWM */
} backlight;
/* MIPI DSI */
diff --git a/drivers/gpu/drm/i915/intel_bios.c
b/drivers/gpu/drm/i915/intel_bios.c
index 1af7074..1a5b124 100644
--- a/drivers/gpu/drm/i915/intel_bios.c
+++ b/drivers/gpu/drm/i915/intel_bios.c
@@ -284,6 +284,7 @@ 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)
@@ -296,6 +297,7 @@ 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) {
@@ -304,6 +306,16 @@ parse_lfp_backlight(struct drm_i915_private *dev_priv,
return;
}
+ /*
+ * IF the VBT version is less than 191, set the
+ * pwm controller as PMIC by default.
+ */
+ dev_priv->vbt.backlight.pwm_pin = BLC_CONTROL_PIN_PMIC;
+ if (bdb->version >= 191) {
+ dev_priv->vbt.backlight.pwm_pin = bl_ctrl_data->pin;
+ dev_priv->vbt.backlight.pwm_controller =
bl_ctrl_data->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;
diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
index c87b450..02a74b0 100644
--- a/drivers/gpu/drm/i915/intel_drv.h
+++ b/drivers/gpu/drm/i915/intel_drv.h
@@ -124,6 +124,11 @@
#define INTEL_I2C_BUS_DVO 1
#define INTEL_I2C_BUS_SDVO 2
+#define BLC_CONTROL_PIN_PMIC 0
+#define BLC_CONTROL_PIN_LPSS_PWM 1
+#define BLC_CONTROL_PIN_DDI 2
+#define BLC_CONTROL_PIN_PANEL_PWM 3
+
/* these are outputs from the chip - integrated only
external chips are via DVO or SDVO output */
enum intel_output_type {
diff --git a/drivers/gpu/drm/i915/intel_vbt_defs.h
b/drivers/gpu/drm/i915/intel_vbt_defs.h
index 749dcea..f6744dc 100644
--- a/drivers/gpu/drm/i915/intel_vbt_defs.h
+++ b/drivers/gpu/drm/i915/intel_vbt_defs.h
@@ -440,10 +440,16 @@ struct bdb_lfp_backlight_data_entry {
u8 obsolete3;
} __packed;
+struct bdb_lfp_backlight_control_data {
+ u8 pin:4;
+ u8 controller: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 {
--
1.9.1
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