linux-kernel - [PATCH] phy: sun4i-usb: replace use of system_wq with system_percpu

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Message-ID: <20251105152023.259813-1-marco.crivellari@suse.com>
Date: Wed,  5 Nov 2025 16:20:23 +0100
From: Marco Crivellari <marco.crivellari@...e.com>
To: linux-kernel@...r.kernel.org,
	linux-phy@...ts.infradead.org,
	linux-arm-kernel@...ts.infradead.org,
	linux-sunxi@...ts.linux.dev
Cc: Tejun Heo <tj@...nel.org>,
	Lai Jiangshan <jiangshanlai@...il.com>,
	Frederic Weisbecker <frederic@...nel.org>,
	Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
	Marco Crivellari <marco.crivellari@...e.com>,
	Michal Hocko <mhocko@...e.com>,
	Vinod Koul <vkoul@...nel.org>,
	Kishon Vijay Abraham I <kishon@...nel.org>,
	Chen-Yu Tsai <wens@...e.org>,
	Jernej Skrabec <jernej.skrabec@...il.com>,
	Samuel Holland <samuel@...lland.org>
Subject: [PATCH] phy: sun4i-usb: replace use of system_wq with system_percpu_wq

Currently if a user enqueues a work item using schedule_delayed_work() the
used wq is "system_wq" (per-cpu wq) while queue_delayed_work() use
WORK_CPU_UNBOUND (used when a cpu is not specified). The same applies to
schedule_work() that is using system_wq and queue_work(), that makes use
again of WORK_CPU_UNBOUND.

This lack of consistency cannot be addressed without refactoring the API.

This patch continues the effort to refactor worqueue APIs, which has begun
with the change introducing new workqueues and a new alloc_workqueue flag:

commit 128ea9f6ccfb ("workqueue: Add system_percpu_wq and system_dfl_wq")
commit 930c2ea566af ("workqueue: Add new WQ_PERCPU flag")

Replace system_wq with system_percpu_wq, keeping the same behavior.
The old wq (system_wq) will be kept for a few release cycles.

Suggested-by: Tejun Heo <tj@...nel.org>
Signed-off-by: Marco Crivellari <marco.crivellari@...e.com>
---
 drivers/phy/allwinner/phy-sun4i-usb.c | 14 +++++++-------
 1 file changed, 7 insertions(+), 7 deletions(-)

diff --git a/drivers/phy/allwinner/phy-sun4i-usb.c b/drivers/phy/allwinner/phy-sun4i-usb.c
index 59d38d88efb0..e2fbf8ccf99e 100644
--- a/drivers/phy/allwinner/phy-sun4i-usb.c
+++ b/drivers/phy/allwinner/phy-sun4i-usb.c
@@ -359,7 +359,7 @@ static int sun4i_usb_phy_init(struct phy *_phy)
 		/* Force ISCR and cable state updates */
 		data->id_det = -1;
 		data->vbus_det = -1;
-		queue_delayed_work(system_wq, &data->detect, 0);
+		queue_delayed_work(system_percpu_wq, &data->detect, 0);
 	}
 
 	return 0;
@@ -482,7 +482,7 @@ static int sun4i_usb_phy_power_on(struct phy *_phy)
 
 	/* We must report Vbus high within OTG_TIME_A_WAIT_VRISE msec. */
 	if (phy->index == 0 && sun4i_usb_phy0_poll(data))
-		mod_delayed_work(system_wq, &data->detect, DEBOUNCE_TIME);
+		mod_delayed_work(system_percpu_wq, &data->detect, DEBOUNCE_TIME);
 
 	return 0;
 }
@@ -503,7 +503,7 @@ static int sun4i_usb_phy_power_off(struct phy *_phy)
 	 * Vbus gpio to not trigger an edge irq on Vbus off, so force a rescan.
 	 */
 	if (phy->index == 0 && !sun4i_usb_phy0_poll(data))
-		mod_delayed_work(system_wq, &data->detect, POLL_TIME);
+		mod_delayed_work(system_percpu_wq, &data->detect, POLL_TIME);
 
 	return 0;
 }
@@ -542,7 +542,7 @@ static int sun4i_usb_phy_set_mode(struct phy *_phy,
 
 	data->id_det = -1; /* Force reprocessing of id */
 	data->force_session_end = true;
-	queue_delayed_work(system_wq, &data->detect, 0);
+	queue_delayed_work(system_percpu_wq, &data->detect, 0);
 
 	return 0;
 }
@@ -654,7 +654,7 @@ static void sun4i_usb_phy0_id_vbus_det_scan(struct work_struct *work)
 		extcon_set_state_sync(data->extcon, EXTCON_USB, vbus_det);
 
 	if (sun4i_usb_phy0_poll(data))
-		queue_delayed_work(system_wq, &data->detect, POLL_TIME);
+		queue_delayed_work(system_percpu_wq, &data->detect, POLL_TIME);
 }
 
 static irqreturn_t sun4i_usb_phy0_id_vbus_det_irq(int irq, void *dev_id)
@@ -662,7 +662,7 @@ static irqreturn_t sun4i_usb_phy0_id_vbus_det_irq(int irq, void *dev_id)
 	struct sun4i_usb_phy_data *data = dev_id;
 
 	/* vbus or id changed, let the pins settle and then scan them */
-	mod_delayed_work(system_wq, &data->detect, DEBOUNCE_TIME);
+	mod_delayed_work(system_percpu_wq, &data->detect, DEBOUNCE_TIME);
 
 	return IRQ_HANDLED;
 }
@@ -676,7 +676,7 @@ static int sun4i_usb_phy0_vbus_notify(struct notifier_block *nb,
 
 	/* Properties on the vbus_power_supply changed, scan vbus_det */
 	if (val == PSY_EVENT_PROP_CHANGED && psy == data->vbus_power_supply)
-		mod_delayed_work(system_wq, &data->detect, DEBOUNCE_TIME);
+		mod_delayed_work(system_percpu_wq, &data->detect, DEBOUNCE_TIME);
 
 	return NOTIFY_OK;
 }
-- 
2.51.1