From: Paul Cercueil <paul@crapouillou.net>
To: Bin Liu <b-liu@ti.com>, Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: od@zcrc.me, linux-usb@vger.kernel.org,
linux-kernel@vger.kernel.org,
Paul Cercueil <paul@crapouillou.net>
Subject: [PATCH] usb: musb: Disable pullup at init
Date: Sat, 14 Dec 2019 23:18:15 +0100 [thread overview]
Message-ID: <20191214221815.97483-1-paul@crapouillou.net> (raw)
The pullup may be already enabled before the driver is initialized. This
happens for instance on JZ4740.
It has to be disabled at init time, as we cannot guarantee that a gadget
driver will be bound to the UDC.
Signed-off-by: Paul Cercueil <paul@crapouillou.net>
Suggested-by: Bin Liu <b-liu@ti.com>
---
drivers/usb/musb/musb_core.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/drivers/usb/musb/musb_core.c b/drivers/usb/musb/musb_core.c
index 15cca912c53e..c91d5c2ed4ad 100644
--- a/drivers/usb/musb/musb_core.c
+++ b/drivers/usb/musb/musb_core.c
@@ -2310,6 +2310,9 @@ musb_init_controller(struct device *dev, int nIrq, void __iomem *ctrl)
musb_disable_interrupts(musb);
musb_writeb(musb->mregs, MUSB_DEVCTL, 0);
+ /* MUSB_POWER_SOFTCONN might be already set, JZ4740 does this. */
+ musb_writeb(musb->mregs, MUSB_POWER, 0);
+
/* Init IRQ workqueue before request_irq */
INIT_DELAYED_WORK(&musb->irq_work, musb_irq_work);
INIT_DELAYED_WORK(&musb->deassert_reset_work, musb_deassert_reset);
--
2.24.0
next reply other threads:[~2019-12-14 22:18 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-12-14 22:18 Paul Cercueil [this message]
2019-12-16 16:21 ` [PATCH] usb: musb: Disable pullup at init Bin Liu
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