diff options
| author | Mario Limonciello (AMD) <superm1@kernel.org> | 2026-01-05 21:52:48 -0600 |
|---|---|---|
| committer | Alex Deucher <alexander.deucher@amd.com> | 2026-01-20 17:19:28 -0500 |
| commit | 0a62732e53d7e295e1733a2d9bf661e593d86675 (patch) | |
| tree | 13dfa261c28764bceeb37772129504adfa28c3e4 | |
| parent | 8cee62904caf95e5698fa0f2d420f5f22b4dea15 (diff) | |
drm/amd/display: Detect panel type from VSDB
[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>
| -rw-r--r-- | drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c | 15 | ||||
| -rw-r--r-- | drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.h | 11 | ||||
| -rw-r--r-- | drivers/gpu/drm/amd/display/dc/dc.h | 1 | ||||
| -rw-r--r-- | drivers/gpu/drm/amd/display/dc/dc_types.h | 7 |
4 files changed, 34 insertions, 0 deletions
diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c index da8bc02c0f5b..b4ba60e90c47 100644 --- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c +++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c @@ -13146,9 +13146,24 @@ static int parse_amd_vsdb(struct amdgpu_dm_connector *aconnector, if (ieeeId == HDMI_AMD_VENDOR_SPECIFIC_DATA_BLOCK_IEEE_REGISTRATION_ID && amd_vsdb->version == HDMI_AMD_VENDOR_SPECIFIC_DATA_BLOCK_VERSION_3) { + u8 panel_type; vsdb_info->replay_mode = (amd_vsdb->feature_caps & AMD_VSDB_VERSION_3_FEATURECAP_REPLAYMODE) ? true : false; vsdb_info->amd_vsdb_version = HDMI_AMD_VENDOR_SPECIFIC_DATA_BLOCK_VERSION_3; drm_dbg_kms(aconnector->base.dev, "Panel supports Replay Mode: %d\n", vsdb_info->replay_mode); + panel_type = (amd_vsdb->color_space_eotf_support & AMD_VDSB_VERSION_3_PANEL_TYPE_MASK) >> AMD_VDSB_VERSION_3_PANEL_TYPE_SHIFT; + switch (panel_type) { + case AMD_VSDB_PANEL_TYPE_OLED: + aconnector->dc_link->panel_type = PANEL_TYPE_OLED; + break; + case AMD_VSDB_PANEL_TYPE_MINILED: + aconnector->dc_link->panel_type = PANEL_TYPE_MINILED; + break; + default: + aconnector->dc_link->panel_type = PANEL_TYPE_NONE; + break; + } + drm_dbg_kms(aconnector->base.dev, "Panel type: %d\n", + aconnector->dc_link->panel_type); return true; } diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.h b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.h index 115efd8ec68b..800813671748 100644 --- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.h +++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.h @@ -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 { diff --git a/drivers/gpu/drm/amd/display/dc/dc.h b/drivers/gpu/drm/amd/display/dc/dc.h index 20432bd1ff5b..694d0050a636 100644 --- a/drivers/gpu/drm/amd/display/dc/dc.h +++ b/drivers/gpu/drm/amd/display/dc/dc.h @@ -1734,6 +1734,7 @@ struct dc_scratch_space { bool link_powered_externally; // Used to bypass hardware sequencing delays when panel is powered down forcibly struct dc_panel_config panel_config; + enum dc_panel_type panel_type; struct phy_state phy_state; uint32_t phy_transition_bitmask; // BW ALLOCATON USB4 ONLY diff --git a/drivers/gpu/drm/amd/display/dc/dc_types.h b/drivers/gpu/drm/amd/display/dc/dc_types.h index bb1387233bd8..0e953059ff6d 100644 --- a/drivers/gpu/drm/amd/display/dc/dc_types.h +++ b/drivers/gpu/drm/amd/display/dc/dc_types.h @@ -964,6 +964,13 @@ struct display_endpoint_id { enum display_endpoint_type ep_type; }; +enum dc_panel_type { + PANEL_TYPE_NONE = 0, // UNKONWN, not determined yet + PANEL_TYPE_LCD = 1, + PANEL_TYPE_OLED = 2, + PANEL_TYPE_MINILED = 3, +}; + enum backlight_control_type { BACKLIGHT_CONTROL_PWM = 0, BACKLIGHT_CONTROL_VESA_AUX = 1, |