[RFC PATCH] phy: ti: tusb1210: Move long delayed work on system_dfl_long_wq

[Marco Crivellari]

Currently the code enqueue work items using {queue|mod}_delayed_work(),
using system_long_wq. This workqueue should be used when long works are
expected and it is a per-cpu workqueue.

The function(s) end up calling __queue_delayed_work(), which set a global
timer that could fire anywhere, enqueuing the work where the timer fired.

Unbound works could benefit from scheduler task placement, to optimize
performance and power consumption. Long work shouldn't stick to a single
CPU.

Recently, a new unbound workqueue specific for long running work has
been added:

    c116737e972e ("workqueue: Add system_dfl_long_wq for long unbound works")

Since the workqueue work doesn't rely on per-cpu variables, there is no
obvious reason that justify the use of a per-cpu workqueue. So change
system_long_wq with system_dfl_long_wq so that the work may benefit from
scheduler task placement.

Signed-off-by: Marco Crivellari <marco.crivellari at suse.com>
---
 drivers/phy/ti/phy-tusb1210.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/phy/ti/phy-tusb1210.c b/drivers/phy/ti/phy-tusb1210.c
index c3ae9d7948d7..9956921c094b 100644
--- a/drivers/phy/ti/phy-tusb1210.c
+++ b/drivers/phy/ti/phy-tusb1210.c
@@ -197,7 +197,7 @@ static void tusb1210_chg_det_set_state(struct tusb1210 *tusb,
 			tusb1210_chg_det_states[new_state], delay_ms);
 
 	tusb->chg_det_state = new_state;
-	mod_delayed_work(system_long_wq, &tusb->chg_det_work,
+	mod_delayed_work(system_dfl_long_wq, &tusb->chg_det_work,
 			 msecs_to_jiffies(delay_ms));
 }
 
@@ -380,7 +380,7 @@ static int tusb1210_psy_notifier(struct notifier_block *nb,
 	struct power_supply *psy = ptr;
 
 	if (psy != tusb->psy && psy->desc->type == POWER_SUPPLY_TYPE_USB)
-		queue_delayed_work(system_long_wq, &tusb->chg_det_work, 0);
+		queue_delayed_work(system_dfl_long_wq, &tusb->chg_det_work, 0);
 
 	return NOTIFY_OK;
 }
@@ -458,7 +458,7 @@ static void tusb1210_probe_charger_detect(struct tusb1210 *tusb)
 	 */
 	tusb->chg_det_state = TUSB1210_CHG_DET_DISCONNECTED;
 	INIT_DELAYED_WORK(&tusb->chg_det_work, tusb1210_chg_det_work);
-	queue_delayed_work(system_long_wq, &tusb->chg_det_work, 2 * HZ);
+	queue_delayed_work(system_dfl_long_wq, &tusb->chg_det_work, 2 * HZ);
 
 	tusb->psy_nb.notifier_call = tusb1210_psy_notifier;
 	power_supply_reg_notifier(&tusb->psy_nb);
-- 
2.53.0