From c738a794e5295ea6668ec9441c8df28c9a3c7502 Mon Sep 17 00:00:00 2001 From: Mika Westerberg Date: Fri, 8 May 2020 11:47:00 +0300 Subject: [PATCH] thunderbolt: Increase path length in discovery Currently we have only supported paths that follow daisy-chain topology but USB4 also allows to build trees of devices. For this reason increase maximum path length we use for discovery to be from the lowest level to the host router and back to the same level. Signed-off-by: Mika Westerberg --- drivers/thunderbolt/tb.h | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) diff --git a/drivers/thunderbolt/tb.h b/drivers/thunderbolt/tb.h index 6916168..b53ef5b 100644 --- a/drivers/thunderbolt/tb.h +++ b/drivers/thunderbolt/tb.h @@ -286,7 +286,11 @@ struct tb_path { /* HopIDs 0-7 are reserved by the Thunderbolt protocol */ #define TB_PATH_MIN_HOPID 8 -#define TB_PATH_MAX_HOPS 7 +/* + * Support paths from the farthest (depth 6) router to the host and back + * to the same level (not necessarily to the same router). + */ +#define TB_PATH_MAX_HOPS (7 * 2) /** * struct tb_cm_ops - Connection manager specific operations vector -- 2.7.4