From f7d5b5ff088fc85baa563182f5ff2cd501ed56d5 Mon Sep 17 00:00:00 2001 From: =?utf8?q?Ville=20Syrj=C3=A4l=C3=A4?= Date: Fri, 3 May 2024 15:24:29 +0300 Subject: [PATCH] drm/i915/bios: Define VBT block 15 (Dot Clock Override Table) contents MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit 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 Link: https://patchwork.freedesktop.org/patch/msgid/20240503122449.27266-16-ville.syrjala@linux.intel.com Acked-by: Jani Nikula --- 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 741ad566f0cc..75c702c9890b 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 */ -- 2.50.1