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USB: s3c-hsotg: Re-initialise all FIFOs on USB bus reset

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The USB documentation suggest that the FIFOs should be reset when a
bus reset event happens. Use the s3c_hsotg_init_fifo() to ensure that
the FIFO layout is correct and that the FIFOs are flushed before
acknowledging the reset.

Signed-off-by: Ben Dooks <ben-linux@fluff.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Ben Dooks 2010-07-19 09:40:43 +01:00 committed by Greg Kroah-Hartman
parent e7a9ff5427
commit b3864cedfb
1 changed files with 4 additions and 9 deletions
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13
drivers/usb/gadget/s3c-hsotg.c
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@ -2082,17 +2082,12 @@ static irqreturn_t s3c_hsotg_irq(int irq, void *pw)
kill_all_requests(hsotg, &hsotg->eps[0], -ECONNRESET, true); kill_all_requests(hsotg, &hsotg->eps[0], -ECONNRESET, true);
/* it seems after a reset we can end up with a situation /* it seems after a reset we can end up with a situation
* where the TXFIFO still has data in it... try flushing * where the TXFIFO still has data in it... the docs
* it to remove anything that may still be in it. * suggest resetting all the fifos, so use the init_fifo
* code to relayout and flush the fifos.
*/ */
if (1) { s3c_hsotg_init_fifo(hsotg);
writel(S3C_GRSTCTL_TxFNum(0) | S3C_GRSTCTL_TxFFlsh,
hsotg->regs + S3C_GRSTCTL);
dev_info(hsotg->dev, "GNPTXSTS=%08x\n",
readl(hsotg->regs + S3C_GNPTXSTS));
}
s3c_hsotg_enqueue_setup(hsotg); s3c_hsotg_enqueue_setup(hsotg);