github-mirror/linux
1
0
Fork 0
mirror of https://github.com/torvalds/linux.git synced 2026-05-23 14:42:08 +02:00
Code Issues Actions Packages Projects Releases Wiki Activity Graph

drm/amd/display: Detect panel type from VSDB

Browse Source 
[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
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

15
drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
View File

@ -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;
}

11
drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.h
View File

@ -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 {

1
drivers/gpu/drm/amd/display/dc/dc.h
View File

@ -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

7
drivers/gpu/drm/amd/display/dc/dc_types.h
View File

@ -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,