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thunderbolt: Disable LTTPR on Intel Titan Ridge

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Intel Titan Ridge does not disable AUX timers when it gets SET_CONFIG
with SET_LTTPR_MODE set which makes DP tunneling to fail. For this
reason disable LTTPR on Titan Ridge device side.

Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
This commit is contained in:
Mika Westerberg 2021-10-27 13:29:09 +03:00
parent 97486e981f
commit 3eddfc121f
2 changed files with 11 additions and 0 deletions
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1
drivers/thunderbolt/tb_regs.h
View File

@ -389,6 +389,7 @@ struct tb_regs_port_header {
#define DP_COMMON_CAP_1_LANE 0x0
#define DP_COMMON_CAP_2_LANES 0x1
#define DP_COMMON_CAP_4_LANES 0x2
#define DP_COMMON_CAP_LTTPR_NS BIT(27)
#define DP_COMMON_CAP_DPRX_DONE BIT(31)
/* PCIe adapter registers */

10
drivers/thunderbolt/tunnel.c
View File

@ -580,6 +580,16 @@ static int tb_dp_xchg_caps(struct tb_tunnel *tunnel)
out_dp_cap = tb_dp_cap_set_lanes(out_dp_cap, new_lanes);
}
/*
* Titan Ridge does not disable AUX timers when it gets
* SET_CONFIG with SET_LTTPR_MODE set. This causes problems with
* DP tunneling.
*/
if (tb_route(out->sw) && tb_switch_is_titan_ridge(out->sw)) {
out_dp_cap |= DP_COMMON_CAP_LTTPR_NS;
tb_port_dbg(out, "disabling LTTPR\n");
}
return tb_port_write(in, &out_dp_cap, TB_CFG_PORT,
in->cap_adap + DP_REMOTE_CAP, 1);
}