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| author | Mika Westerberg <mika.westerberg@linux.intel.com> | 2021-11-18 09:10:59 +0200 |
|---|---|---|
| committer | Mika Westerberg <mika.westerberg@linux.intel.com> | 2021-12-07 15:18:33 +0300 |
| commit | e5bb88e961e5e3e72e3cc3a866a232115bd15e1e (patch) | |
| tree | 270e5c225be2f8f650ca3262f14c0bcbb749c8c8 /drivers/thunderbolt/switch.c | |
| parent | 6cb27a04fb779717c4a3d20233b93596885838cf (diff) | |
| download | linux-e5bb88e961e5e3e72e3cc3a866a232115bd15e1e.tar.bz2 | |
thunderbolt: Do not program path HopIDs for USB4 routers
These fields are marked read-only for USB4 routers so do not touch them
in that case. Update the kernel-doc of tb_dp_port_set_hops() to reflect
this too.
Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Diffstat (limited to 'drivers/thunderbolt/switch.c')
| -rw-r--r-- | drivers/thunderbolt/switch.c | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/drivers/thunderbolt/switch.c b/drivers/thunderbolt/switch.c index 463cfdc0b42f..e00f4b878b56 100644 --- a/drivers/thunderbolt/switch.c +++ b/drivers/thunderbolt/switch.c @@ -1322,7 +1322,9 @@ int tb_dp_port_hpd_clear(struct tb_port *port) * @aux_tx: AUX TX Hop ID * @aux_rx: AUX RX Hop ID * - * Programs specified Hop IDs for DP IN/OUT port. + * Programs specified Hop IDs for DP IN/OUT port. Can be called for USB4 + * router DP adapters too but does not program the values as the fields + * are read-only. */ int tb_dp_port_set_hops(struct tb_port *port, unsigned int video, unsigned int aux_tx, unsigned int aux_rx) @@ -1330,6 +1332,9 @@ int tb_dp_port_set_hops(struct tb_port *port, unsigned int video, u32 data[2]; int ret; + if (tb_switch_is_usb4(port->sw)) + return 0; + ret = tb_port_read(port, data, TB_CFG_PORT, port->cap_adap + ADP_DP_CS_0, ARRAY_SIZE(data)); if (ret) |