diff options
| author | Mika Westerberg <mika.westerberg@linux.intel.com> | 2021-10-27 12:29:09 +0200 |
|---|---|---|
| committer | Mika Westerberg <mika.westerberg@linux.intel.com> | 2022-02-02 11:56:38 +0100 |
| commit | 3eddfc121f90e174253031594b354e5764f8a318 (patch) | |
| tree | d3f74e32190c4ca72a8fd88075c186c110a764ce /drivers/thunderbolt | |
| parent | thunderbolt: Remove useless DMA-32 fallback configuration (diff) | |
| download | linux-3eddfc121f90e174253031594b354e5764f8a318.tar.xz linux-3eddfc121f90e174253031594b354e5764f8a318.zip | |
thunderbolt: Disable LTTPR on Intel Titan Ridge
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>
Diffstat (limited to 'drivers/thunderbolt')
| -rw-r--r-- | drivers/thunderbolt/tb_regs.h | 1 | ||||
| -rw-r--r-- | drivers/thunderbolt/tunnel.c | 10 |
2 files changed, 11 insertions, 0 deletions
diff --git a/drivers/thunderbolt/tb_regs.h b/drivers/thunderbolt/tb_regs.h index a74f4878d3e7..9693a6ec5950 100644 --- a/drivers/thunderbolt/tb_regs.h +++ b/drivers/thunderbolt/tb_regs.h @@ -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 */ diff --git a/drivers/thunderbolt/tunnel.c b/drivers/thunderbolt/tunnel.c index a473cc7d9a8d..118742ec93ed 100644 --- a/drivers/thunderbolt/tunnel.c +++ b/drivers/thunderbolt/tunnel.c @@ -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); } |