linux-kernel - [PATCH 3/4] usb: musb: da8xx: Remove try_idle implementation from host-only mode

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Message-ID: <20240528102026.40136-4-bastien.curutchet@bootlin.com>
Date: Tue, 28 May 2024 12:20:25 +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 3/4] usb: musb: da8xx: Remove try_idle implementation from host-only mode

The idle_state is not meant for host-only mode. When the device acts as a
host, it fails to exit the idle state once entered. This prevents new
USB gadgets from being detected once plugged in.

Commit 032ec49f5351 ("usb: musb: drop useless board_mode usage") removed
a is_otg_enabled() check in the try_idle() that prevented from entering
idle_state. This was removed because at that time it was not possible to
select host-only mode with CONFIG_USB_MUSB_HOST so dual role was always
set.

Add #ifndef CONFIG_USB_MUSB_HOST around try_idle() callback to prevent
from entering idle_state when host-only mode has been selected.

Signed-off-by: Bastien Curutchet <bastien.curutchet@...tlin.com>
---
 drivers/usb/musb/da8xx.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/usb/musb/da8xx.c b/drivers/usb/musb/da8xx.c
index 1681f9fba3da..c5cf733673a2 100644
--- a/drivers/usb/musb/da8xx.c
+++ b/drivers/usb/musb/da8xx.c
@@ -191,7 +191,7 @@ static void otg_timer(struct timer_list *t)
 	spin_unlock_irqrestore(&musb->lock, flags);
 }
 
-static void da8xx_musb_try_idle(struct musb *musb, unsigned long timeout)
+static void __maybe_unused da8xx_musb_try_idle(struct musb *musb, unsigned long timeout)
 {
 	static unsigned long last_timer;
 
@@ -476,7 +476,10 @@ static const struct musb_platform_ops da8xx_ops = {
 	.disable	= da8xx_musb_disable,
 
 	.set_mode	= da8xx_musb_set_mode,
+
+#ifndef CONFIG_USB_MUSB_HOST
 	.try_idle	= da8xx_musb_try_idle,
+#endif
 
 	.set_vbus	= da8xx_musb_set_vbus,
 };
-- 
2.44.0