[PATCH v3 08/47] thunderbolt: Reset only non-USB4 host routers in resume

[Imre Deak]

From: Mika Westerberg <mika.westerberg at linux.intel.com>

There is no need to reset the USB4 host routers on resume because they
are reset already and this may cause problems if the link does not come
up soon enough. For this reason limit this to happen in non-USB4 host
routers only (that's Apple systems with Intel Thunderbolt controllers).

Fixes: 59a54c5f3dbd ("thunderbolt: Reset topology created by the boot firmware")
Cc: Sanath S <Sanath.S at amd.com>
Signed-off-by: Mika Westerberg <mika.westerberg at linux.intel.com>
---
 drivers/thunderbolt/tb.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/drivers/thunderbolt/tb.c b/drivers/thunderbolt/tb.c
index 9a261560d0f4c..f127088b6ebd1 100644
--- a/drivers/thunderbolt/tb.c
+++ b/drivers/thunderbolt/tb.c
@@ -2710,8 +2710,12 @@ static int tb_resume_noirq(struct tb *tb)
 
 	tb_dbg(tb, "resuming...\n");
 
-	/* remove any pci devices the firmware might have setup */
-	tb_switch_reset(tb->root_switch);
+	/*
+	 * For non-USB4 hosts (Apple systems) remove any PCIe devices
+	 * the firmware might have setup.
+	 */
+	if (!tb_switch_is_usb4(tb->root_switch))
+		tb_switch_reset(tb->root_switch);
 
 	tb_switch_resume(tb->root_switch);
 	tb_free_invalid_tunnels(tb);
-- 
2.39.2