linux-kernel - [PATCH] usb: phy-generic: add short delay after pulling the reset pin

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Message-Id: <20240402-phy-misc-v1-1-de5c17f93f17@pengutronix.de>
Date: Tue, 02 Apr 2024 08:17:17 +0200
From: Michael Grzeschik <m.grzeschik@...gutronix.de>
To: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc: linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org, 
 Michael Grzeschik <m.grzeschik@...gutronix.de>
Subject: [PATCH] usb: phy-generic: add short delay after pulling the reset
 pin

After pulling the reset pin some phys are not immediately ready. We add
a short delay of at least 10 ms to ensure that the phy can be properly
used.

Signed-off-by: Michael Grzeschik <m.grzeschik@...gutronix.de>
---
 drivers/usb/phy/phy-generic.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/usb/phy/phy-generic.c b/drivers/usb/phy/phy-generic.c
index fdcffebf415cd..e7d50e0a16123 100644
--- a/drivers/usb/phy/phy-generic.c
+++ b/drivers/usb/phy/phy-generic.c
@@ -71,6 +71,7 @@ static void nop_reset(struct usb_phy_generic *nop)
 	gpiod_set_value_cansleep(nop->gpiod_reset, 1);
 	usleep_range(10000, 20000);
 	gpiod_set_value_cansleep(nop->gpiod_reset, 0);
+	usleep_range(10000, 30000);
 }
 
 /* interface to regulator framework */

---
base-commit: 5bab5dc780c9ed0c69fc2f828015532acf4a7848
change-id: 20240402-phy-misc-e3f056ec3f29

Best regards,
-- 
Michael Grzeschik <m.grzeschik@...gutronix.de>