From: Deepak M <m.deepak@xxxxxxxxx>
These fields in VBT indicates the PWM source which
is used and also the controller number.
v2 by Jani: check for out of bounds access, some renames, change default
type, etc.
v3 by Jani: s/INTEL_BACKLIGHT_CABC/INTEL_BACKLIGHT_DSI_DCS/
Signed-off-by: Deepak M <m.deepak@xxxxxxxxx>
Signed-off-by: Jani Nikula <jani.nikula@xxxxxxxxx>
---
drivers/gpu/drm/i915/i915_drv.h | 1 +
drivers/gpu/drm/i915/intel_bios.c | 9 +++++++++
drivers/gpu/drm/i915/intel_bios.h | 8 ++++++++
drivers/gpu/drm/i915/intel_vbt_defs.h | 6 ++++++
4 files changed, 24 insertions(+)
diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index f6d71590bd7b..49c033c78f35 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -1472,6 +1472,7 @@ struct intel_vbt_data {
bool present;
bool active_low_pwm;
u8 min_brightness; /* min_brightness/255 of max */
+ enum intel_backlight_type type;
} backlight;
/* MIPI DSI */
diff --git a/drivers/gpu/drm/i915/intel_bios.c b/drivers/gpu/drm/i915/intel_bios.c
index 6985519921b4..2f639820aded 100644
--- a/drivers/gpu/drm/i915/intel_bios.c
+++ b/drivers/gpu/drm/i915/intel_bios.c
@@ -304,6 +304,15 @@ parse_lfp_backlight(struct drm_i915_private *dev_priv,
return;
}
+ dev_priv->vbt.backlight.type = INTEL_BACKLIGHT_DISPLAY_DDI;
+ if (bdb->version >= 191 &&
+ get_blocksize(backlight_data) >= sizeof(*backlight_data)) {
+ const struct bdb_lfp_backlight_control_method *method;
+
+ method = &backlight_data->backlight_control[panel_type];
+ dev_priv->vbt.backlight.type = method->type;
+ }
+
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_bios.h b/drivers/gpu/drm/i915/intel_bios.h
index 149c3226e895..8405b5a367d7 100644
--- a/drivers/gpu/drm/i915/intel_bios.h
+++ b/drivers/gpu/drm/i915/intel_bios.h
@@ -30,6 +30,14 @@
#ifndef _INTEL_BIOS_H_
#define _INTEL_BIOS_H_
+enum intel_backlight_type {
+ INTEL_BACKLIGHT_PMIC,
+ INTEL_BACKLIGHT_LPSS,
+ INTEL_BACKLIGHT_DISPLAY_DDI,
+ INTEL_BACKLIGHT_DSI_DCS,
+ INTEL_BACKLIGHT_PANEL_DRIVER_INTERFACE,
+};
+
struct edp_power_seq {
u16 t1_t3;
u16 t8;
diff --git a/drivers/gpu/drm/i915/intel_vbt_defs.h b/drivers/gpu/drm/i915/intel_vbt_defs.h
index 749dceab7c02..2191076c3ff6 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_method {
+ u8 type: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_method backlight_control[16];
} __packed;
struct aimdb_header {
--
2.1.4
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