提交 39fbc9c8 编写于 作者: J Jani Nikula

drm/i915: check VBT for supported backlight type

The only supported types are none and PWM. Other values are obsolete or
reserved, don't add them.
Tested-by: NKamal Mostafa <kamal@canonical.com>
Tested-by: NMartin <bugs@mrvanes.com>
Tested-by: jrg.otte@gmail.com
Reviewed-by: NVille Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: NJani Nikula <jani.nikula@intel.com>
上级 2ab1bc9d
......@@ -1308,6 +1308,7 @@ struct intel_vbt_data {
struct {
u16 pwm_freq_hz;
bool present;
bool active_low_pwm;
} backlight;
......
......@@ -287,6 +287,9 @@ 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;
/* Err to enabling backlight if no backlight block. */
dev_priv->vbt.backlight.present = true;
backlight_data = find_section(bdb, BDB_LVDS_BACKLIGHT);
if (!backlight_data)
return;
......@@ -299,6 +302,13 @@ parse_lfp_backlight(struct drm_i915_private *dev_priv, struct bdb_header *bdb)
entry = &backlight_data->data[panel_type];
dev_priv->vbt.backlight.present = entry->type == BDB_BACKLIGHT_TYPE_PWM;
if (!dev_priv->vbt.backlight.present) {
DRM_DEBUG_KMS("PWM backlight not present in VBT (type %u)\n",
entry->type);
return;
}
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, "
......
......@@ -374,6 +374,9 @@ struct bdb_lvds_lfp_data {
struct bdb_lvds_lfp_data_entry data[16];
} __packed;
#define BDB_BACKLIGHT_TYPE_NONE 0
#define BDB_BACKLIGHT_TYPE_PWM 2
struct bdb_lfp_backlight_data_entry {
u8 type:2;
u8 active_low_pwm:1;
......
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