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drm/i915/bios: Define VBT block 15 (Dot Clock Override Table) contents

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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@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240503122449.27266-16-ville.syrjala@linux.intel.com
Acked-by: Jani Nikula <jani.nikula@intel.com>
This commit is contained in:
Ville Syrjälä
2024-05-03 15:24:29 +03:00
parent 2f1aa210fe
commit f7d5b5ff08
1 changed files with 30 additions and 0 deletions
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30
drivers/gpu/drm/i915/display/intel_vbt_defs.h
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@@ -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
*/