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authorMacpaul Lin <macpaul.lin@mediatek.com>2020-05-24 21:50:47 -0500
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2020-05-25 13:36:30 +0200
commit402bcac4b25b520c89ba60db85eb6316f36e797f (patch)
tree3d595b71a3577c0ba646b8c326b09f37970461ab /drivers/usb/musb
parente62361c721453b5cf76ce3bb8680fb8bc0832098 (diff)
downloadlinux-402bcac4b25b520c89ba60db85eb6316f36e797f.tar.bz2
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>
Diffstat (limited to 'drivers/usb/musb')
-rw-r--r--drivers/usb/musb/mediatek.c6
1 files changed, 6 insertions, 0 deletions
diff --git a/drivers/usb/musb/mediatek.c b/drivers/usb/musb/mediatek.c
index 6196b0e8d77d..eebeadd26946 100644
--- a/drivers/usb/musb/mediatek.c
+++ b/drivers/usb/musb/mediatek.c
@@ -208,6 +208,12 @@ static irqreturn_t generic_interrupt(int irq, void *__hci)
musb->int_rx = musb_clearw(musb->mregs, MUSB_INTRRX);
musb->int_tx = musb_clearw(musb->mregs, MUSB_INTRTX);
+ if ((musb->int_usb & MUSB_INTR_RESET) && !is_host_active(musb)) {
+ /* ep0 FADDR must be 0 when (re)entering peripheral mode */
+ musb_ep_select(musb->mregs, 0);
+ musb_writeb(musb->mregs, MUSB_FADDR, 0);
+ }
+
if (musb->int_usb || musb->int_tx || musb->int_rx)
retval = musb_interrupt(musb);