From: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
Define the contents of VBT block 15 (Dot Clock Override Table)
The contents were reverse engineered by intuition. The gen2 stuff
seems solid as I can verify that against real world VBT data. The
gen3 stuff less so as all the gen3+ VBTs I have just filla the
entire block with zeroes.
Signed-off-by: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
---
drivers/gpu/drm/i915/display/intel_vbt_defs.h | 30 +++++++++++++++++++
1 file changed, 30 insertions(+)
diff --git a/drivers/gpu/drm/i915/display/intel_vbt_defs.h b/drivers/gpu/drm/i915/display/intel_vbt_defs.h
index 2075d53ca317..c2f73c7d9412 100644
--- a/drivers/gpu/drm/i915/display/intel_vbt_defs.h
+++ b/drivers/gpu/drm/i915/display/intel_vbt_defs.h
@@ -797,6 +797,36 @@ struct bdb_driver_persistence {
u8 persistent_max_config;
} __packed;
+/*
+ * Block 15 - Dot Clock Override Table
+ */
+
+struct dot_clock_override_entry_gen2 {
+ u32 dotclock;
+ u8 n;
+ u8 m1;
+ u8 m2;
+ u8 p1:5;
+ u8 p1_div_by_2:1;
+ u8 reserved:1;
+ u8 p2_div_by_4:1;
+} __packed;
+
+struct dot_clock_override_entry_gen3 {
+ u32 dotclock;
+ u8 n;
+ u8 m1;
+ u8 m2;
+ u8 p1;
+ u8 p2;
+} __packed;
+
+struct bdb_dot_clock_override {
+ u8 row_size; /* 8 == gen2, 9 == gen3+ */
+ u8 num_rows;
+ struct dot_clock_override_entry_gen3 table[]; /* or _gen2 */
+} __packed;
+
/*
* Block 22 - SDVO LVDS General Options
*/
--
2.43.2
