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usb: musb: mediatek: add reset FADDR to zero in reset interrupt handle
When receiving reset interrupt, FADDR need to be reset to zero in peripheral mode. Otherwise ep0 cannot do enumeration when re-plugging USB cable. Signed-off-by: Macpaul Lin <macpaul.lin@mediatek.com> Acked-by: Min Guo <min.guo@mediatek.com> Signed-off-by: Bin Liu <b-liu@ti.com> Link: https://lore.kernel.org/r/20200525025049.3400-5-b-liu@ti.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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1 changed files with 6 additions and 0 deletions
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@ -208,6 +208,12 @@ static irqreturn_t generic_interrupt(int irq, void *__hci)
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musb->int_rx = musb_clearw(musb->mregs, MUSB_INTRRX);
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musb->int_tx = musb_clearw(musb->mregs, MUSB_INTRTX);
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if ((musb->int_usb & MUSB_INTR_RESET) && !is_host_active(musb)) {
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/* ep0 FADDR must be 0 when (re)entering peripheral mode */
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musb_ep_select(musb->mregs, 0);
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musb_writeb(musb->mregs, MUSB_FADDR, 0);
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}
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if (musb->int_usb || musb->int_tx || musb->int_rx)
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retval = musb_interrupt(musb);
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