linux-kernel - [PATCH v2 2/6] usb: xhci: tegra: Remove redundant mutex when setting phy mode

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Message-Id: <20260127-diogo-tegra_phy-v2-2-787b9eed3ed5@tecnico.ulisboa.pt>
Date: Tue, 27 Jan 2026 15:11:48 +0000
From: Diogo Ivo <diogo.ivo@...nico.ulisboa.pt>
To: Mathias Nyman <mathias.nyman@...el.com>, 
 Greg Kroah-Hartman <gregkh@...uxfoundation.org>, 
 Thierry Reding <thierry.reding@...il.com>, 
 Jonathan Hunter <jonathanh@...dia.com>, JC Kuo <jckuo@...dia.com>, 
 Vinod Koul <vkoul@...nel.org>, Kishon Vijay Abraham I <kishon@...nel.org>, 
 Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>, 
 Conor Dooley <conor+dt@...nel.org>, 
 Neil Armstrong <neil.armstrong@...aro.org>
Cc: linux-usb@...r.kernel.org, linux-tegra@...r.kernel.org, 
 linux-kernel@...r.kernel.org, linux-phy@...ts.infradead.org, 
 devicetree@...r.kernel.org, Diogo Ivo <diogo.ivo@...nico.ulisboa.pt>
Subject: [PATCH v2 2/6] usb: xhci: tegra: Remove redundant mutex when
 setting phy mode

As the PHY subsystem already synchronizes concurrent accesses to a PHY
instance with a core-internal mutex remove the driver specific mutex
synchronization.

Signed-off-by: Diogo Ivo <diogo.ivo@...nico.ulisboa.pt>
---
v1->v2:
- New patch
---
 drivers/usb/host/xhci-tegra.c | 4 ----
 1 file changed, 4 deletions(-)

diff --git a/drivers/usb/host/xhci-tegra.c b/drivers/usb/host/xhci-tegra.c
index 8b492871d21d..927861ca14f2 100644
--- a/drivers/usb/host/xhci-tegra.c
+++ b/drivers/usb/host/xhci-tegra.c
@@ -1357,15 +1357,11 @@ static void tegra_xhci_id_work(struct work_struct *work)
 
 	dev_dbg(tegra->dev, "host mode %s\n", str_on_off(tegra->host_mode));
 
-	mutex_lock(&tegra->lock);
-
 	if (tegra->host_mode)
 		phy_set_mode_ext(phy, PHY_MODE_USB_OTG, USB_ROLE_HOST);
 	else
 		phy_set_mode_ext(phy, PHY_MODE_USB_OTG, USB_ROLE_NONE);
 
-	mutex_unlock(&tegra->lock);
-
 	tegra->otg_usb3_port = tegra_xusb_padctl_get_usb3_companion(tegra->padctl,
 								    tegra->otg_usb2_port);
 

-- 
2.52.0