diff options
| author | Mika Westerberg <mika.westerberg@linux.intel.com> | 2022-03-23 17:45:39 +0300 |
|---|---|---|
| committer | Mika Westerberg <mika.westerberg@linux.intel.com> | 2023-01-17 12:37:16 +0300 |
| commit | 6ce3563520be90a155706bafc186fc264a13850e (patch) | |
| tree | 8c3c4adba67ab76fdb10a9e3e98498f573a853d4 /drivers/thunderbolt/tb_msgs.h | |
| parent | 630f211be7c0a8cf693fef2b6d77d0ac357041e0 (diff) | |
| download | linux-6ce3563520be90a155706bafc186fc264a13850e.tar.xz | |
thunderbolt: Add support for DisplayPort bandwidth allocation mode
The USB4 spec defines an optional feature that allows the connection
manager to negotiate with the graphics through DPCD registers changes in
the bandwidth allocation dynamically. This is referred as "bandwidth
allocation mode" in the spec. The connection manager uses DP IN adapters
registers to communicate with the graphics, and also gets notifications
from these adapters when the graphics wants to change the bandwidth
allocation. Both the connection manager and the graphics driver needs to
support this.
We check if the DP IN adapter supports this and if it does enable it
before establishing a DP tunnel. Then we react on DP_BW notifications
coming from the DP IN adapter and update the bandwidth allocation
accordingly (within the maximum common capabilities the DP IN/OUT
support).
Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Diffstat (limited to 'drivers/thunderbolt/tb_msgs.h')
| -rw-r--r-- | drivers/thunderbolt/tb_msgs.h | 11 |
1 files changed, 7 insertions, 4 deletions
diff --git a/drivers/thunderbolt/tb_msgs.h b/drivers/thunderbolt/tb_msgs.h index 33c4c7aed56d..3234bff07899 100644 --- a/drivers/thunderbolt/tb_msgs.h +++ b/drivers/thunderbolt/tb_msgs.h @@ -29,6 +29,7 @@ enum tb_cfg_error { TB_CFG_ERROR_HEC_ERROR_DETECTED = 12, TB_CFG_ERROR_FLOW_CONTROL_ERROR = 13, TB_CFG_ERROR_LOCK = 15, + TB_CFG_ERROR_DP_BW = 32, }; /* common header */ @@ -64,14 +65,16 @@ struct cfg_write_pkg { /* TB_CFG_PKG_ERROR */ struct cfg_error_pkg { struct tb_cfg_header header; - enum tb_cfg_error error:4; - u32 zero1:4; + enum tb_cfg_error error:8; u32 port:6; - u32 zero2:2; /* Both should be zero, still they are different fields. */ - u32 zero3:14; + u32 reserved:16; u32 pg:2; } __packed; +struct cfg_ack_pkg { + struct tb_cfg_header header; +}; + #define TB_CFG_ERROR_PG_HOT_PLUG 0x2 #define TB_CFG_ERROR_PG_HOT_UNPLUG 0x3 |