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usb: musb: Disable pullup at init 

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>
Cc: stable@vger.kernel.org
Signed-off-by: Bin Liu <b-liu@ti.com>
Link: https://lore.kernel.org/r/20200107152625.857-3-b-liu@ti.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Paul Cercueil 2020-01-07 09:26:25 -06:00 committed by Greg Kroah-Hartman
parent 5fbf7a2534
commit 96a0c12843
1 changed files with 3 additions and 0 deletions
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3
drivers/usb/musb/musb_core.c
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@ -2318,6 +2318,9 @@ musb_init_controller(struct device *dev, int nIrq, void __iomem *ctrl)
musb_disable_interrupts(musb); musb_disable_interrupts(musb);
musb_writeb(musb->mregs, MUSB_DEVCTL, 0); 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 IRQ workqueue before request_irq */
INIT_DELAYED_WORK(&musb->irq_work, musb_irq_work); INIT_DELAYED_WORK(&musb->irq_work, musb_irq_work);
INIT_DELAYED_WORK(&musb->deassert_reset_work, musb_deassert_reset); INIT_DELAYED_WORK(&musb->deassert_reset_work, musb_deassert_reset);