Commit 3eddfc12 authored by Mika Westerberg's avatar Mika Westerberg
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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: default avatarMika Westerberg <mika.westerberg@linux.intel.com>
parent 97486e98

drivers/thunderbolt/tb_regs.h

+1 −0
Original line number Diff line number Diff line
@@ -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 */

drivers/thunderbolt/tunnel.c

+10 −0
Original line number Diff line number Diff line
@@ -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);

}