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From: Sasha Levin <sashal@kernel.org>
To: linux-kernel@vger.kernel.org, stable@vger.kernel.org
Cc: Mika Westerberg <mika.westerberg@linux.intel.com>,
	Brad Campbell <lists2009@fnarfbargle.com>,
	Sasha Levin <sashal@kernel.org>,
	andreas.noever@gmail.com, michael.jamet@intel.com,
	YehezkelShB@gmail.com, linux-usb@vger.kernel.org
Subject: [PATCH AUTOSEL 5.15 09/51] thunderbolt: Use different lane for second DisplayPort tunnel
Date: Tue,  7 Jun 2022 13:55:08 -0400	[thread overview]
Message-ID: <20220607175552.479948-9-sashal@kernel.org> (raw)
In-Reply-To: <20220607175552.479948-1-sashal@kernel.org>

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

[ Upstream commit 9d2d0a5cf0ca063f417681cc33e767ce52615286 ]

Brad reported that on Apple hardware with Light Ridge or Falcon Ridge
controller, plugging in a chain of Thunderbolt displays (Light Ridge
based controllers) causes all kinds of tearing and flickering. The
reason for this is that on Thunderbolt 1 hardware there is no lane
bonding so we have two independent 10 Gb/s lanes, and currently Linux
tunnels both displays through the lane 1. This makes the displays to
share the 10 Gb/s bandwidth which may not be enough for higher
resolutions.

For this reason make the second tunnel go through the lane 0 instead.
This seems to match what the macOS connection manager is also doing.

Reported-by: Brad Campbell <lists2009@fnarfbargle.com>
Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Tested-by: Brad Campbell <lists2009@fnarfbargle.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/thunderbolt/tb.c     | 19 +++++++++++++++++--
 drivers/thunderbolt/test.c   | 16 ++++++++--------
 drivers/thunderbolt/tunnel.c | 11 ++++++-----
 drivers/thunderbolt/tunnel.h |  4 ++--
 4 files changed, 33 insertions(+), 17 deletions(-)

diff --git a/drivers/thunderbolt/tb.c b/drivers/thunderbolt/tb.c
index 2897a77d44c3..b805b6939794 100644
--- a/drivers/thunderbolt/tb.c
+++ b/drivers/thunderbolt/tb.c
@@ -851,7 +851,7 @@ static struct tb_port *tb_find_dp_out(struct tb *tb, struct tb_port *in)
 
 static void tb_tunnel_dp(struct tb *tb)
 {
-	int available_up, available_down, ret;
+	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;
@@ -896,6 +896,20 @@ static void tb_tunnel_dp(struct tb *tb)
 		return;
 	}
 
+	/*
+	 * This is only applicable to links that are not bonded (so
+	 * when Thunderbolt 1 hardware is involved somewhere in the
+	 * topology). For these try to share the DP bandwidth between
+	 * the two lanes.
+	 */
+	link_nr = 1;
+	list_for_each_entry(tunnel, &tcm->tunnel_list, list) {
+		if (tb_tunnel_is_dp(tunnel)) {
+			link_nr = 0;
+			break;
+		}
+	}
+
 	/*
 	 * DP stream needs the domain to be active so runtime resume
 	 * both ends of the tunnel.
@@ -927,7 +941,8 @@ static void tb_tunnel_dp(struct tb *tb)
 	tb_dbg(tb, "available bandwidth for new DP tunnel %u/%u Mb/s\n",
 	       available_up, available_down);
 
-	tunnel = tb_tunnel_alloc_dp(tb, in, out, available_up, available_down);
+	tunnel = tb_tunnel_alloc_dp(tb, in, out, link_nr, available_up,
+				    available_down);
 	if (!tunnel) {
 		tb_port_dbg(out, "could not allocate DP tunnel\n");
 		goto err_reclaim;
diff --git a/drivers/thunderbolt/test.c b/drivers/thunderbolt/test.c
index 1f69bab236ee..66b6e665e96f 100644
--- a/drivers/thunderbolt/test.c
+++ b/drivers/thunderbolt/test.c
@@ -1348,7 +1348,7 @@ static void tb_test_tunnel_dp(struct kunit *test)
 	in = &host->ports[5];
 	out = &dev->ports[13];
 
-	tunnel = tb_tunnel_alloc_dp(NULL, in, out, 0, 0);
+	tunnel = tb_tunnel_alloc_dp(NULL, in, out, 1, 0, 0);
 	KUNIT_ASSERT_TRUE(test, tunnel != NULL);
 	KUNIT_EXPECT_EQ(test, tunnel->type, TB_TUNNEL_DP);
 	KUNIT_EXPECT_PTR_EQ(test, tunnel->src_port, in);
@@ -1394,7 +1394,7 @@ static void tb_test_tunnel_dp_chain(struct kunit *test)
 	in = &host->ports[5];
 	out = &dev4->ports[14];
 
-	tunnel = tb_tunnel_alloc_dp(NULL, in, out, 0, 0);
+	tunnel = tb_tunnel_alloc_dp(NULL, in, out, 1, 0, 0);
 	KUNIT_ASSERT_TRUE(test, tunnel != NULL);
 	KUNIT_EXPECT_EQ(test, tunnel->type, TB_TUNNEL_DP);
 	KUNIT_EXPECT_PTR_EQ(test, tunnel->src_port, in);
@@ -1444,7 +1444,7 @@ static void tb_test_tunnel_dp_tree(struct kunit *test)
 	in = &dev2->ports[13];
 	out = &dev5->ports[13];
 
-	tunnel = tb_tunnel_alloc_dp(NULL, in, out, 0, 0);
+	tunnel = tb_tunnel_alloc_dp(NULL, in, out, 1, 0, 0);
 	KUNIT_ASSERT_TRUE(test, tunnel != NULL);
 	KUNIT_EXPECT_EQ(test, tunnel->type, TB_TUNNEL_DP);
 	KUNIT_EXPECT_PTR_EQ(test, tunnel->src_port, in);
@@ -1509,7 +1509,7 @@ static void tb_test_tunnel_dp_max_length(struct kunit *test)
 	in = &dev6->ports[13];
 	out = &dev12->ports[13];
 
-	tunnel = tb_tunnel_alloc_dp(NULL, in, out, 0, 0);
+	tunnel = tb_tunnel_alloc_dp(NULL, in, out, 1, 0, 0);
 	KUNIT_ASSERT_TRUE(test, tunnel != NULL);
 	KUNIT_EXPECT_EQ(test, tunnel->type, TB_TUNNEL_DP);
 	KUNIT_EXPECT_PTR_EQ(test, tunnel->src_port, in);
@@ -1627,7 +1627,7 @@ static void tb_test_tunnel_port_on_path(struct kunit *test)
 	in = &dev2->ports[13];
 	out = &dev5->ports[13];
 
-	dp_tunnel = tb_tunnel_alloc_dp(NULL, in, out, 0, 0);
+	dp_tunnel = tb_tunnel_alloc_dp(NULL, in, out, 1, 0, 0);
 	KUNIT_ASSERT_TRUE(test, dp_tunnel != NULL);
 
 	KUNIT_EXPECT_TRUE(test, tb_tunnel_port_on_path(dp_tunnel, in));
@@ -2009,7 +2009,7 @@ static void tb_test_credit_alloc_dp(struct kunit *test)
 	in = &host->ports[5];
 	out = &dev->ports[14];
 
-	tunnel = tb_tunnel_alloc_dp(NULL, in, out, 0, 0);
+	tunnel = tb_tunnel_alloc_dp(NULL, in, out, 1, 0, 0);
 	KUNIT_ASSERT_TRUE(test, tunnel != NULL);
 	KUNIT_ASSERT_EQ(test, tunnel->npaths, (size_t)3);
 
@@ -2245,7 +2245,7 @@ static struct tb_tunnel *TB_TEST_DP_TUNNEL1(struct kunit *test,
 
 	in = &host->ports[5];
 	out = &dev->ports[13];
-	dp_tunnel1 = tb_tunnel_alloc_dp(NULL, in, out, 0, 0);
+	dp_tunnel1 = tb_tunnel_alloc_dp(NULL, in, out, 1, 0, 0);
 	KUNIT_ASSERT_TRUE(test, dp_tunnel1 != NULL);
 	KUNIT_ASSERT_EQ(test, dp_tunnel1->npaths, (size_t)3);
 
@@ -2282,7 +2282,7 @@ static struct tb_tunnel *TB_TEST_DP_TUNNEL2(struct kunit *test,
 
 	in = &host->ports[6];
 	out = &dev->ports[14];
-	dp_tunnel2 = tb_tunnel_alloc_dp(NULL, in, out, 0, 0);
+	dp_tunnel2 = tb_tunnel_alloc_dp(NULL, in, out, 1, 0, 0);
 	KUNIT_ASSERT_TRUE(test, dp_tunnel2 != NULL);
 	KUNIT_ASSERT_EQ(test, dp_tunnel2->npaths, (size_t)3);
 
diff --git a/drivers/thunderbolt/tunnel.c b/drivers/thunderbolt/tunnel.c
index bb5cc480fc9a..bd98c719bf55 100644
--- a/drivers/thunderbolt/tunnel.c
+++ b/drivers/thunderbolt/tunnel.c
@@ -843,6 +843,7 @@ struct tb_tunnel *tb_tunnel_discover_dp(struct tb *tb, struct tb_port *in)
  * @tb: Pointer to the domain structure
  * @in: DP in adapter port
  * @out: DP out adapter port
+ * @link_nr: Preferred lane adapter when the link is not bonded
  * @max_up: Maximum available upstream bandwidth for the DP tunnel (%0
  *	    if not limited)
  * @max_down: Maximum available downstream bandwidth for the DP tunnel
@@ -854,8 +855,8 @@ struct tb_tunnel *tb_tunnel_discover_dp(struct tb *tb, struct tb_port *in)
  * Return: Returns a tb_tunnel on success or NULL on failure.
  */
 struct tb_tunnel *tb_tunnel_alloc_dp(struct tb *tb, struct tb_port *in,
-				     struct tb_port *out, int max_up,
-				     int max_down)
+				     struct tb_port *out, int link_nr,
+				     int max_up, int max_down)
 {
 	struct tb_tunnel *tunnel;
 	struct tb_path **paths;
@@ -879,21 +880,21 @@ struct tb_tunnel *tb_tunnel_alloc_dp(struct tb *tb, struct tb_port *in,
 	paths = tunnel->paths;
 
 	path = tb_path_alloc(tb, in, TB_DP_VIDEO_HOPID, out, TB_DP_VIDEO_HOPID,
-			     1, "Video");
+			     link_nr, "Video");
 	if (!path)
 		goto err_free;
 	tb_dp_init_video_path(path);
 	paths[TB_DP_VIDEO_PATH_OUT] = path;
 
 	path = tb_path_alloc(tb, in, TB_DP_AUX_TX_HOPID, out,
-			     TB_DP_AUX_TX_HOPID, 1, "AUX TX");
+			     TB_DP_AUX_TX_HOPID, link_nr, "AUX TX");
 	if (!path)
 		goto err_free;
 	tb_dp_init_aux_path(path);
 	paths[TB_DP_AUX_PATH_OUT] = path;
 
 	path = tb_path_alloc(tb, out, TB_DP_AUX_RX_HOPID, in,
-			     TB_DP_AUX_RX_HOPID, 1, "AUX RX");
+			     TB_DP_AUX_RX_HOPID, link_nr, "AUX RX");
 	if (!path)
 		goto err_free;
 	tb_dp_init_aux_path(path);
diff --git a/drivers/thunderbolt/tunnel.h b/drivers/thunderbolt/tunnel.h
index eea14e24f7e0..a92027431697 100644
--- a/drivers/thunderbolt/tunnel.h
+++ b/drivers/thunderbolt/tunnel.h
@@ -69,8 +69,8 @@ struct tb_tunnel *tb_tunnel_alloc_pci(struct tb *tb, struct tb_port *up,
 				      struct tb_port *down);
 struct tb_tunnel *tb_tunnel_discover_dp(struct tb *tb, struct tb_port *in);
 struct tb_tunnel *tb_tunnel_alloc_dp(struct tb *tb, struct tb_port *in,
-				     struct tb_port *out, int max_up,
-				     int max_down);
+				     struct tb_port *out, int link_nr,
+				     int max_up, int max_down);
 struct tb_tunnel *tb_tunnel_alloc_dma(struct tb *tb, struct tb_port *nhi,
 				      struct tb_port *dst, int transmit_path,
 				      int transmit_ring, int receive_path,
-- 
2.35.1


  parent reply	other threads:[~2022-06-07 18:33 UTC|newest]

Thread overview: 54+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-06-07 17:55 [PATCH AUTOSEL 5.15 01/51] iio: dummy: iio_simple_dummy: check the return value of kstrdup() Sasha Levin
2022-06-07 17:55 ` [PATCH AUTOSEL 5.15 02/51] staging: rtl8712: fix a potential memory leak in r871xu_drv_init() Sasha Levin
2022-06-07 17:55 ` [PATCH AUTOSEL 5.15 03/51] iio: st_sensors: Add a local lock for protecting odr Sasha Levin
2022-06-07 17:55 ` [PATCH AUTOSEL 5.15 04/51] lkdtm/usercopy: Expand size of "out of frame" object Sasha Levin
2022-06-07 17:55 ` [PATCH AUTOSEL 5.15 05/51] drivers: staging: rtl8723bs: Fix deadlock in rtw_surveydone_event_callback() Sasha Levin
2022-06-07 17:55 ` [PATCH AUTOSEL 5.15 06/51] drivers: staging: rtl8192bs: Fix deadlock in rtw_joinbss_event_prehandle() Sasha Levin
2022-06-07 17:55 ` [PATCH AUTOSEL 5.15 07/51] tty: synclink_gt: Fix null-pointer-dereference in slgt_clean() Sasha Levin
2022-06-07 17:55 ` [PATCH AUTOSEL 5.15 08/51] tty: Fix a possible resource leak in icom_probe Sasha Levin
2022-06-07 17:55 ` Sasha Levin [this message]
2022-06-07 17:55 ` [PATCH AUTOSEL 5.15 10/51] drivers: staging: rtl8192u: Fix deadlock in ieee80211_beacons_stop() Sasha Levin
2022-06-07 17:55 ` [PATCH AUTOSEL 5.15 11/51] drivers: staging: rtl8192e: Fix deadlock in rtllib_beacons_stop() Sasha Levin
2022-06-07 17:55 ` [PATCH AUTOSEL 5.15 12/51] USB: host: isp116x: check return value after calling platform_get_resource() Sasha Levin
2022-06-07 17:55 ` [PATCH AUTOSEL 5.15 13/51] drivers: tty: serial: Fix deadlock in sa1100_set_termios() Sasha Levin
2022-06-07 17:55 ` [PATCH AUTOSEL 5.15 14/51] drivers: usb: host: Fix deadlock in oxu_bus_suspend() Sasha Levin
2022-06-07 17:55 ` [PATCH AUTOSEL 5.15 15/51] USB: hcd-pci: Fully suspend across freeze/thaw cycle Sasha Levin
2022-06-07 17:55 ` [PATCH AUTOSEL 5.15 16/51] char: xillybus: fix a refcount leak in cleanup_dev() Sasha Levin
2022-06-07 17:55 ` [PATCH AUTOSEL 5.15 17/51] sysrq: do not omit current cpu when showing backtrace of all active CPUs Sasha Levin
2022-06-07 17:55 ` [PATCH AUTOSEL 5.15 18/51] usb: dwc2: gadget: don't reset gadget's driver->bus Sasha Levin
2022-06-07 17:55 ` [PATCH AUTOSEL 5.15 19/51] soundwire: qcom: adjust autoenumeration timeout Sasha Levin
2022-06-07 17:55 ` [PATCH AUTOSEL 5.15 20/51] misc: rtsx: set NULL intfdata when probe fails Sasha Levin
2022-06-07 17:55 ` [PATCH AUTOSEL 5.15 21/51] extcon: Fix extcon_get_extcon_dev() error handling Sasha Levin
2022-06-07 17:55 ` [PATCH AUTOSEL 5.15 22/51] extcon: Modify extcon device to be created after driver data is set Sasha Levin
2022-06-07 17:55 ` [PATCH AUTOSEL 5.15 23/51] clocksource/drivers/sp804: Avoid error on multiple instances Sasha Levin
2022-06-07 17:55 ` [PATCH AUTOSEL 5.15 24/51] staging: rtl8723bs: Fix alignment to match open parenthesis Sasha Levin
2022-06-08  0:04   ` Joe Perches
2022-06-08  6:15     ` Greg Kroah-Hartman
2022-06-09 13:55       ` Sasha Levin
2022-06-07 17:55 ` [PATCH AUTOSEL 5.15 25/51] staging: rtl8712: fix uninit-value in usb_read8() and friends Sasha Levin
2022-06-07 17:55 ` [PATCH AUTOSEL 5.15 26/51] staging: rtl8712: fix uninit-value in r871xu_drv_init() Sasha Levin
2022-06-07 17:55 ` [PATCH AUTOSEL 5.15 27/51] serial: msm_serial: disable interrupts in __msm_console_write() Sasha Levin
2022-06-07 17:55 ` [PATCH AUTOSEL 5.15 28/51] accessiblity: speakup: Add missing misc_deregister in softsynth_probe Sasha Levin
2022-06-07 17:55 ` [PATCH AUTOSEL 5.15 29/51] kernfs: Separate kernfs_pr_cont_buf and rename_lock Sasha Levin
2022-06-07 17:55 ` [PATCH AUTOSEL 5.15 30/51] watchdog: wdat_wdt: Stop watchdog when rebooting the system Sasha Levin
2022-06-07 17:55 ` [PATCH AUTOSEL 5.15 31/51] md: don't unregister sync_thread with reconfig_mutex held Sasha Levin
2022-06-07 17:55 ` [PATCH AUTOSEL 5.15 32/51] md: protect md_unregister_thread from reentrancy Sasha Levin
2022-06-07 17:55 ` [PATCH AUTOSEL 5.15 33/51] scsi: myrb: Fix up null pointer access on myrb_cleanup() Sasha Levin
2022-06-07 17:55 ` [PATCH AUTOSEL 5.15 34/51] Revert "net: af_key: add check for pfkey_broadcast in function pfkey_process" Sasha Levin
2022-06-07 17:55 ` [PATCH AUTOSEL 5.15 35/51] ceph: allow ceph.dir.rctime xattr to be updatable Sasha Levin
2022-06-07 17:55 ` [PATCH AUTOSEL 5.15 36/51] ceph: flush the mdlog for filesystem sync Sasha Levin
2022-06-07 17:55 ` [PATCH AUTOSEL 5.15 37/51] drm/amd/display: Check if modulo is 0 before dividing Sasha Levin
2022-06-07 17:55 ` [PATCH AUTOSEL 5.15 38/51] drm/radeon: fix a possible null pointer dereference Sasha Levin
2022-06-07 17:55 ` [PATCH AUTOSEL 5.15 39/51] drm/amd/pm: Fix missing thermal throttler status Sasha Levin
2022-06-07 17:55 ` [PATCH AUTOSEL 5.15 40/51] um: line: Use separate IRQs per line Sasha Levin
2022-06-07 17:55 ` [PATCH AUTOSEL 5.15 41/51] modpost: fix undefined behavior of is_arm_mapping_symbol() Sasha Levin
2022-06-07 17:55 ` [PATCH AUTOSEL 5.15 42/51] x86/cpu: Elide KCSAN for cpu_has() and friends Sasha Levin
2022-06-07 17:55 ` [PATCH AUTOSEL 5.15 43/51] jump_label,noinstr: Avoid instrumentation for JUMP_LABEL=n builds Sasha Levin
2022-06-07 17:55 ` [PATCH AUTOSEL 5.15 44/51] nbd: call genl_unregister_family() first in nbd_cleanup() Sasha Levin
2022-06-07 17:55 ` [PATCH AUTOSEL 5.15 45/51] nbd: fix race between nbd_alloc_config() and module removal Sasha Levin
2022-06-07 17:55 ` [PATCH AUTOSEL 5.15 46/51] nbd: fix io hung while disconnecting device Sasha Levin
2022-06-07 17:55 ` [PATCH AUTOSEL 5.15 47/51] fs/ntfs3: Fix invalid free in log_replay Sasha Levin
2022-06-07 17:55 ` [PATCH AUTOSEL 5.15 48/51] s390/gmap: voluntarily schedule during key setting Sasha Levin
2022-06-07 17:55 ` [PATCH AUTOSEL 5.15 49/51] cifs: version operations for smb20 unneeded when legacy support disabled Sasha Levin
2022-06-07 17:55 ` [PATCH AUTOSEL 5.15 50/51] drm/amd/pm: use bitmap_{from,to}_arr32 where appropriate Sasha Levin
2022-06-07 17:55 ` [PATCH AUTOSEL 5.15 51/51] nodemask: Fix return values to be unsigned Sasha Levin

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