linux-kernel - [PATCH 6.6 04/14] thunderbolt: Create multiple DisplayPort tunnels if there are more DP IN/OUT pairs

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Message-Id: <20241001173109.1513-5-alexandru.gagniuc@hp.com>
Date: Tue,  1 Oct 2024 17:30:59 +0000
From: Alexandru Gagniuc <alexandru.gagniuc@...com>
To: gregkh@...uxfoundation.org,
	stable@...r.kernel.org
Cc: qin.wan@...com,
	andreas.noever@...il.com,
	michael.jamet@...el.com,
	mika.westerberg@...ux.intel.com,
	YehezkelShB@...il.com,
	linux-usb@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Gil Fine <gil.fine@...ux.intel.com>,
	Alexandru Gagniuc <alexandru.gagniuc@...com>
Subject: [PATCH 6.6 04/14] thunderbolt: Create multiple DisplayPort tunnels if there are more DP IN/OUT pairs

From: Gil Fine <gil.fine@...ux.intel.com>

[ Upstream commit 8648c6465c025c488e2855c209c0dea1a1a15184 ]

Currently we only create one DisplayPort tunnel even if there would be
more DP IN/OUT pairs available. Specifically this happens when a router
is unplugged and we check if a new DisplayPort tunnel can be created. To
cover this create tunnels as long as we find suitable DP IN/OUT pairs.

Signed-off-by: Gil Fine <gil.fine@...ux.intel.com>
Signed-off-by: Mika Westerberg <mika.westerberg@...ux.intel.com>
Signed-off-by: Qin Wan <qin.wan@...com>
Signed-off-by: Alexandru Gagniuc <alexandru.gagniuc@...com>
---
 drivers/thunderbolt/tb.c | 26 +++++++++++++++++---------
 1 file changed, 17 insertions(+), 9 deletions(-)

diff --git a/drivers/thunderbolt/tb.c b/drivers/thunderbolt/tb.c
index 6fc300edad68..e37fb1081420 100644
--- a/drivers/thunderbolt/tb.c
+++ b/drivers/thunderbolt/tb.c
@@ -1282,18 +1282,13 @@ static struct tb_port *tb_find_dp_out(struct tb *tb, struct tb_port *in)
 	return NULL;
 }
 
-static void tb_tunnel_dp(struct tb *tb)
+static bool tb_tunnel_one_dp(struct tb *tb)
 {
 	int available_up, available_down, ret, link_nr;
 	struct tb_cm *tcm = tb_priv(tb);
 	struct tb_port *port, *in, *out;
 	struct tb_tunnel *tunnel;
 
-	if (!tb_acpi_may_tunnel_dp()) {
-		tb_dbg(tb, "DP tunneling disabled, not creating tunnel\n");
-		return;
-	}
-
 	/*
 	 * Find pair of inactive DP IN and DP OUT adapters and then
 	 * establish a DP tunnel between them.
@@ -1321,11 +1316,11 @@ static void tb_tunnel_dp(struct tb *tb)
 
 	if (!in) {
 		tb_dbg(tb, "no suitable DP IN adapter available, not tunneling\n");
-		return;
+		return false;
 	}
 	if (!out) {
 		tb_dbg(tb, "no suitable DP OUT adapter available, not tunneling\n");
-		return;
+		return false;
 	}
 
 	/*
@@ -1398,7 +1393,7 @@ static void tb_tunnel_dp(struct tb *tb)
 	 * TMU mode to HiFi for CL0s to work.
 	 */
 	tb_increase_tmu_accuracy(tunnel);
-	return;
+	return true;
 
 err_free:
 	tb_tunnel_free(tunnel);
@@ -1413,6 +1408,19 @@ static void tb_tunnel_dp(struct tb *tb)
 	pm_runtime_put_autosuspend(&out->sw->dev);
 	pm_runtime_mark_last_busy(&in->sw->dev);
 	pm_runtime_put_autosuspend(&in->sw->dev);
+
+	return false;
+}
+
+static void tb_tunnel_dp(struct tb *tb)
+{
+	if (!tb_acpi_may_tunnel_dp()) {
+		tb_dbg(tb, "DP tunneling disabled, not creating tunnel\n");
+		return;
+	}
+
+	while (tb_tunnel_one_dp(tb))
+		;
 }
 
 static void tb_enter_redrive(struct tb_port *port)
-- 
2.45.1