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Commit f00076d2 authored by Jani Nikula's avatar Jani Nikula Committed by Daniel Vetter
Browse files

drm/i915: parse backlight modulation frequency from the BIOS VBT 



We don't actually do anything with the information yet, but parse and
log what's in the VBT.

Signed-off-by: default avatarJani Nikula <jani.nikula@intel.com>
Signed-off-by: default avatarRodrigo Vivi <rodrigo.vivi@gmail.com>
Reviewed-by: default avatarRodrigo Vivi <rodrigo.vivi@gmail.com>
Signed-off-by: default avatarDaniel Vetter <daniel.vetter@ffwll.ch>
parent df4547d8

drivers/gpu/drm/i915/i915_drv.h

+5 −0
Original line number Diff line number Diff line
@@ -1184,6 +1184,11 @@ struct intel_vbt_data { 
	int edp_bpp;

	struct edp_power_seq edp_pps;



	struct {

		u16 pwm_freq_hz;

		bool active_low_pwm;

	} backlight;



	/* MIPI DSI */

	struct {

		u16 panel_id;

drivers/gpu/drm/i915/intel_bios.c

+29 −0
Original line number Diff line number Diff line
@@ -281,6 +281,34 @@ parse_lfp_panel_data(struct drm_i915_private *dev_priv, 
	}

}



static void

parse_lfp_backlight(struct drm_i915_private *dev_priv, struct bdb_header *bdb)

{

	const struct bdb_lfp_backlight_data *backlight_data;

	const struct bdb_lfp_backlight_data_entry *entry;



	backlight_data = find_section(bdb, BDB_LVDS_BACKLIGHT);

	if (!backlight_data)

		return;



	if (backlight_data->entry_size != sizeof(backlight_data->data[0])) {

		DRM_DEBUG_KMS("Unsupported backlight data entry size %u\n",

			      backlight_data->entry_size);

		return;

	}



	entry = &backlight_data->data[panel_type];



	dev_priv->vbt.backlight.pwm_freq_hz = entry->pwm_freq_hz;

	dev_priv->vbt.backlight.active_low_pwm = entry->active_low_pwm;

	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",

		      entry->min_brightness,

		      backlight_data->level[panel_type]);

}



/* Try to find sdvo panel data */

static void

parse_sdvo_panel_data(struct drm_i915_private *dev_priv,
@@ -894,6 +922,7 @@ intel_parse_bios(struct drm_device *dev) 
	parse_general_features(dev_priv, bdb);

	parse_general_definitions(dev_priv, bdb);

	parse_lfp_panel_data(dev_priv, bdb);

	parse_lfp_backlight(dev_priv, bdb);

	parse_sdvo_panel_data(dev_priv, bdb);

	parse_sdvo_device_mapping(dev_priv, bdb);

	parse_device_mapping(dev_priv, bdb);

drivers/gpu/drm/i915/intel_bios.h

+16 −0
Original line number Diff line number Diff line
@@ -373,6 +373,22 @@ struct bdb_lvds_lfp_data { 
	struct bdb_lvds_lfp_data_entry data[16];

} __packed;



struct bdb_lfp_backlight_data_entry {

	u8 type:2;

	u8 active_low_pwm:1;

	u8 obsolete1:5;

	u16 pwm_freq_hz;

	u8 min_brightness;

	u8 obsolete2;

	u8 obsolete3;

} __packed;



struct bdb_lfp_backlight_data {

	u8 entry_size;

	struct bdb_lfp_backlight_data_entry data[16];

	u8 level[16];

} __packed;



struct aimdb_header {

	char signature[16];

	char oem_device[20];