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

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

Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@gmail.com>
Reviewed-by: Rodrigo Vivi <rodrigo.vivi@gmail.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
This commit is contained in:
Jani Nikula 2013-12-14 20:38:29 -02:00 committed by Daniel Vetter
parent df4547d825
commit f00076d2fd
3 changed files with 50 additions and 0 deletions
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5
drivers/gpu/drm/i915/i915_drv.h
View File

@ -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;

29
drivers/gpu/drm/i915/intel_bios.c
View File

@ -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);

16
drivers/gpu/drm/i915/intel_bios.h
View File

@ -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];