Patchwork [4/6] USB: fsl_qe_udc: Fix disconnects reporting during bus reset

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Submitter Anton Vorontsov
Date Dec. 25, 2008, 2:15 p.m.
Message ID <>
Download mbox | patch
Permalink /patch/15589/
State Accepted, archived
Delegated to: Kumar Gala
Headers show


Anton Vorontsov - Dec. 25, 2008, 2:15 p.m.
Freescale QE UDC controllers can't report the "port change" states,
so the only way to handle disconnects is to process bus reset
interrupts. The bus reset can take some time, that is, few irqs.
Gadgets may print the disconnection events, and this causes few
repetitive messages in the kernel log.

This patch fixes the issue by using the usb_state machine, if the
usb controller has been already reset, just quit the reset irq

Signed-off-by: Anton Vorontsov <>
Acked-by: David Brownell <>
 drivers/usb/gadget/fsl_qe_udc.c |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)


diff --git a/drivers/usb/gadget/fsl_qe_udc.c b/drivers/usb/gadget/fsl_qe_udc.c
index b460c6d..4726582 100644
--- a/drivers/usb/gadget/fsl_qe_udc.c
+++ b/drivers/usb/gadget/fsl_qe_udc.c
@@ -2161,6 +2161,9 @@  static int reset_irq(struct qe_udc *udc)
 	unsigned char i;
+	if (udc->usb_state == USB_STATE_DEFAULT)
+		return 0;
 	out_8(&udc->usb_regs->usb_usadr, 0);