drm/i915: Document the sets of bits in the driver features block

Add a few comment documenting the sets of bits in the driver
features block. Might make it a bit easier to check against
the spec.

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220715202044.11153-8-ville.syrjala@linux.intel.com
Reviewed-by: Jani Nikula <jani.nikula@intel.com>

diff --git a/drivers/gpu/drm/i915/display/intel_vbt_defs.h b/drivers/gpu/drm/i915/display/intel_vbt_defs.h
index f376d41..133e602 100644 (file)
--- a/drivers/gpu/drm/i915/display/intel_vbt_defs.h
+++ b/drivers/gpu/drm/i915/display/intel_vbt_defs.h
@@ -542,6 +542,7 @@ struct bdb_psr {
 #define BDB_DRIVER_FEATURE_INT_SDVO_LVDS       3
 
 struct bdb_driver_features {
+       /* Driver bits */
        u8 boot_dev_algorithm:1;
        u8 block_display_switch:1;
        u8 allow_display_switch:1;
@@ -556,6 +557,7 @@ struct bdb_driver_features {
        u8 boot_mode_bpp;
        u8 boot_mode_refresh;
 
+       /* Extended Driver Bits 1 */
        u16 enable_lfp_primary:1;
        u16 selective_mode_pruning:1;
        u16 dual_frequency:1;
@@ -571,6 +573,7 @@ struct bdb_driver_features {
        u16 tv_hotplug:1;
        u16 hdmi_config:2;
 
+       /* Driver Flags 1 */
        u8 static_display:1;                                    /* 163+ */
        u8 reserved2:7;
 
@@ -578,8 +581,12 @@ struct bdb_driver_features {
        u16 legacy_crt_max_y;
        u8 legacy_crt_max_refresh;
 
+       /* Extended Driver Bits 2 */
        u8 hdmi_termination;
+
        u8 custom_vbt_version;                                  /* 155+ */
+
+       /* Driver Feature Flags */
        u16 rmpm_enabled:1;                                     /* 165+ */
        u16 s2ddt_enabled:1;                                    /* 165+ */
        u16 dpst_enabled:1;                                     /* 165-227 */