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drm/amd/display: Fix DPIA number and driver ID field issue

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[Why]
The DPIA number field is 6 bits in the spec.
In dp_type, it only defines 5 bits.
The driver ID is only 4 bits in the spec.

[How]
Set DPIA number field size to 6.
And only update 4 bits for driver id.

Reviewed-by: Meenakshikumar Somasundaram <meenakshikumar.somasundaram@amd.com>
Signed-off-by: Cruise Hung <Cruise.Hung@amd.com>
Signed-off-by: Ivan Lipski <ivan.lipski@amd.com>
Tested-by: Dan Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Cruise Hung
2026-02-10 17:40:42 +08:00
committed by Alex Deucher
parent d8f6c978fd
commit cf1b9cbb59
2 changed files with 3 additions and 3 deletions
Download Patch File Download Diff File Expand all files Collapse all files

4
drivers/gpu/drm/amd/display/dc/dc_dp_types.h
View File

@@ -947,8 +947,8 @@ union dp_tun_cap_support {
/* DPCD[0xE000E] DP_IN_ADAPTER_INFO register. */
union dpia_info {
struct {
uint8_t dpia_num :5;
uint8_t rsvd :3;
uint8_t dpia_num :6;
uint8_t rsvd :2;
} bits;
uint8_t raw;
};

2
drivers/gpu/drm/amd/display/dc/link/protocols/link_dp_dpia.c
View File

@@ -71,7 +71,7 @@ enum dc_status dpcd_get_tunneling_device_data(struct dc_link *link)
link->dpcd_caps.usb4_dp_tun_info.dpia_info.raw =
dpcd_dp_tun_data[DP_IN_ADAPTER_INFO - DP_TUNNELING_CAPABILITIES_SUPPORT];
link->dpcd_caps.usb4_dp_tun_info.usb4_driver_id =
dpcd_dp_tun_data[DP_USB4_DRIVER_ID - DP_TUNNELING_CAPABILITIES_SUPPORT];
dpcd_dp_tun_data[DP_USB4_DRIVER_ID - DP_TUNNELING_CAPABILITIES_SUPPORT] & 0x0F;
if (link->dpcd_caps.usb4_dp_tun_info.dp_tun_cap.bits.dpia_bw_alloc) {
status = core_link_read_dpcd(link, USB4_DRIVER_BW_CAPABILITY,