Messages in this thread Patch in this message | | | From | Paul Cercueil <> | Subject | [PATCH] usb: musb: Disable pullup at init | Date | Sat, 14 Dec 2019 23:18:15 +0100 |
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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
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