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drm/i915/bios: Define VBT block 57 (Vswing PreEmphasis Table) contents

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Define the contents of VBT block 57 (Vswing PreEmphasis Table).

The contents is highly platform specific. The columns of the
table corresponding to some set of PHY/etc registers. The rows
corresponding to all legal vswing+pre-emphasis combinations
(ie. should be 10 rows in each table). And each table
corresponds to a platform specific (mostly undocumented)
mapping based on link rate/eDP low-vswing/etc. parameters.

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240503122449.27266-32-ville.syrjala@linux.intel.com
Reviewed-by: Jani Nikula <jani.nikula@intel.com>
This commit is contained in:
Ville Syrjälä
2024-05-03 15:24:45 +03:00
parent a7566ba47b
commit 2b22b1b88c
1 changed files with 11 additions and 0 deletions
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11
drivers/gpu/drm/i915/display/intel_vbt_defs.h
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@@ -184,6 +184,7 @@ enum bdb_block_id {
BDB_MIPI_SEQUENCE = 53, /* 177+ */
BDB_RGB_PALETTE = 54, /* 180+ */
BDB_COMPRESSION_PARAMETERS = 56, /* 213+ */
BDB_VSWING_PREEMPH = 57, /* 218+ */
BDB_GENERIC_DTD = 58, /* 229+ */
BDB_SKIP = 254, /* VBIOS only */
};
@@ -1481,6 +1482,16 @@ struct bdb_compression_parameters {
struct dsc_compression_parameters_entry data[16];
} __packed;
/*
* Block 57 - Vswing PreEmphasis Table
*/
struct bdb_vswing_preemph {
u8 num_tables;
u8 num_columns;
u32 tables[];
} __packed;
/*
* Block 58 - Generic DTD Block
*/