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drm/amd/display: Detect panel type from VSDB

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[Why]
The AMD VSDB contains two bits that indicate the type of panel connected.
This can be useful for policy decisions based upon panel technology.

[How]
Read the bits for the panel type when parsing VSDB and store them in
the dc_link.

Reviewed-by: Harry Wentland <harry.wentland@amd.com>
Signed-off-by: Mario Limonciello (AMD) <superm1@kernel.org>
Signed-off-by: Matthew Stewart <matthew.stewart2@amd.com>
Tested-by: Dan Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Mario Limonciello (AMD)
2026-01-05 21:52:48 -06:00
committed by Alex Deucher
parent 8cee62904c
commit 0a62732e53
4 changed files with 34 additions and 0 deletions
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11
drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.h
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@@ -55,8 +55,17 @@
#define HDMI_AMD_VENDOR_SPECIFIC_DATA_BLOCK_IEEE_REGISTRATION_ID 0x00001A
#define AMD_VSDB_VERSION_3_FEATURECAP_REPLAYMODE 0x40
#define AMD_VDSB_VERSION_3_PANEL_TYPE_MASK 0xC0
#define AMD_VDSB_VERSION_3_PANEL_TYPE_SHIFT 6
#define HDMI_AMD_VENDOR_SPECIFIC_DATA_BLOCK_VERSION_3 0x3
enum amd_vsdb_panel_type {
AMD_VSDB_PANEL_TYPE_DEFAULT = 0,
AMD_VSDB_PANEL_TYPE_MINILED,
AMD_VSDB_PANEL_TYPE_OLED,
AMD_VSDB_PANEL_TYPE_RESERVED,
};
#define AMDGPU_HDR_MULT_DEFAULT (0x100000000LL)
/*
@@ -92,6 +101,8 @@ struct amd_vsdb_block {
unsigned char ieee_id[3];
unsigned char version;
unsigned char feature_caps;
unsigned char reserved[3];
unsigned char color_space_eotf_support;
};
struct common_irq_params {