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drm/i915/vbt: Add eDP Data rate overrride field in VBT

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Add edp_data_rate_override field VBT which gives us a mask
of rates which needs to be skipped in favour of
subsequent higher rate.

--v2
-Rename vbt field [Jani]
-Fix comment to 263+ [Jani]
-Use BIT_U32 [Jani]
-Fix the bits assignment in vbt [Jani]

--v3
-Add a mask which represents all link rates [Ankit]

Bspec: 20124
Signed-off-by: Suraj Kandpal <suraj.kandpal@intel.com>
Reviewed-by: Ankit Nautiyal <ankit.k.nautiyal@intel.com>
Link: https://lore.kernel.org/r/20250821042653.269227-2-suraj.kandpal@intel.com
This commit is contained in:
Suraj Kandpal 2025-08-21 09:56:51 +05:30
parent 7c8c76272e
commit 4d33c77cf2
2 changed files with 21 additions and 1 deletions
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4
drivers/gpu/drm/i915/display/intel_bios.c
View File

@ -2748,8 +2748,10 @@ static int child_device_expected_size(u16 version)
{
BUILD_BUG_ON(sizeof(struct child_device_config) < 40);
if (version > 256)
if (version > 263)
return -ENOENT;
else if (version >= 263)
return 44;
else if (version >= 256)
return 40;
else if (version >= 216)

18
drivers/gpu/drm/i915/display/intel_vbt_defs.h
View File

@ -437,6 +437,22 @@ enum vbt_gmbus_ddi {
#define BDB_230_VBT_DP_MAX_LINK_RATE_UHBR13P5 6
#define BDB_230_VBT_DP_MAX_LINK_RATE_UHBR20 7
/* EDP link rate 263+ */
#define BDB_263_VBT_EDP_LINK_RATE_1_62 BIT_U32(0)
#define BDB_263_VBT_EDP_LINK_RATE_2_16 BIT_U32(1)
#define BDB_263_VBT_EDP_LINK_RATE_2_43 BIT_U32(2)
#define BDB_263_VBT_EDP_LINK_RATE_2_7 BIT_U32(3)
#define BDB_263_VBT_EDP_LINK_RATE_3_24 BIT_U32(4)
#define BDB_263_VBT_EDP_LINK_RATE_4_32 BIT_U32(5)
#define BDB_263_VBT_EDP_LINK_RATE_5_4 BIT_U32(6)
#define BDB_263_VBT_EDP_LINK_RATE_6_75 BIT_U32(7)
#define BDB_263_VBT_EDP_LINK_RATE_8_1 BIT_U32(8)
#define BDB_263_VBT_EDP_LINK_RATE_10 BIT_U32(9)
#define BDB_263_VBT_EDP_LINK_RATE_13_5 BIT_U32(10)
#define BDB_263_VBT_EDP_LINK_RATE_20 BIT_U32(11)
#define BDB_263_VBT_EDP_NUM_RATES 12
#define BDB_263_VBT_EDP_RATES_MASK GENMASK(BDB_263_VBT_EDP_NUM_RATES - 1, 0)
/*
* The child device config, aka the display device data structure, provides a
* description of a port and its configuration on the platform.
@ -547,6 +563,8 @@ struct child_device_config {
u8 dp_max_link_rate:3; /* 216+ */
u8 dp_max_link_rate_reserved:5; /* 216+ */
u8 efp_index; /* 256+ */
u32 edp_data_rate_override:12; /* 263+ */
u32 edp_data_rate_override_reserved:20; /* 263+ */
} __packed;
struct bdb_general_definitions {