linux-kernel - [PATCH 2/4] Revert "usb: musb: da8xx: Set phy in OTG mode by default"

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Date: Tue, 28 May 2024 12:20:24 +0200
From: Bastien Curutchet <bastien.curutchet@...tlin.com>
To: Vinod Koul <vkoul@...nel.org>,
	Kishon Vijay Abraham I <kishon@...nel.org>,
	Bin Liu <b-liu@...com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc: linux-phy@...ts.infradead.org,
	linux-kernel@...r.kernel.org,
	linux-usb@...r.kernel.org,
	Thomas Petazzoni <thomas.petazzoni@...tlin.com>,
	herve.codina@...tlin.com,
	christophercordahi@...ometrics.ca,
	Bastien Curutchet <bastien.curutchet@...tlin.com>
Subject: [PATCH 2/4] Revert "usb: musb: da8xx: Set phy in OTG mode by default"

This reverts commit 7ccf62941a38701ec9a42b4a0fa2868af456e96a.

da8xx_musb_set_mode() forces OTG mode regardless the selected mode even
if the property 'dr_mode = "host"' is present in device-tree. This
causes an unrecoverable error when VBUS supply is shut down : plugged
gadgets are no longer detected once VBUS supply is back.

Reverting it allows to have a selected mode coherent with device-tree's
description. IMO, this shouldn't cause regression because OTG mode is
the default selection when 'dr_mode' property is not set.

Signed-off-by: Bastien Curutchet <bastien.curutchet@...tlin.com>
---
 drivers/usb/musb/da8xx.c | 7 -------
 1 file changed, 7 deletions(-)

diff --git a/drivers/usb/musb/da8xx.c b/drivers/usb/musb/da8xx.c
index 8abf3a567e30..1681f9fba3da 100644
--- a/drivers/usb/musb/da8xx.c
+++ b/drivers/usb/musb/da8xx.c
@@ -328,13 +328,6 @@ static int da8xx_musb_set_mode(struct musb *musb, u8 musb_mode)
 	struct da8xx_glue *glue = dev_get_drvdata(musb->controller->parent);
 	enum phy_mode phy_mode;
 
-	/*
-	 * The PHY has some issues when it is forced in device or host mode.
-	 * Unless the user request another mode, configure the PHY in OTG mode.
-	 */
-	if (!musb->is_initialized)
-		return phy_set_mode(glue->phy, PHY_MODE_USB_OTG);
-
 	switch (musb_mode) {
 	case MUSB_HOST:		/* Force VBUS valid, ID = 0 */
 		phy_mode = PHY_MODE_USB_HOST;
-- 
2.44.0