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From ben@ben-laptop.fluff.org Thu Jul 22 16:49:16 2010
From: Ben Dooks <ben-linux@fluff.org>
To: linux-samsung-soc@vger.kernel.org, linux-usb@vger.kernel.org
Cc: gregkh@suse.de, Ben Dooks <ben-linux@fluff.org>
Subject: USB: s3c-hsotg: Re-initialise all FIFOs on USB bus reset
Date: Mon, 19 Jul 2010 09:40:43 +0100
Message-Id: <1279528850-28245-5-git-send-email-ben-linux@fluff.org>
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>
---
drivers/usb/gadget/s3c-hsotg.c | 13 ++++---------
1 file changed, 4 insertions(+), 9 deletions(-)
--- a/drivers/usb/gadget/s3c-hsotg.c
+++ b/drivers/usb/gadget/s3c-hsotg.c
@@ -2082,17 +2082,12 @@ irq_retry:
kill_all_requests(hsotg, &hsotg->eps[0], -ECONNRESET, true);
/* it seems after a reset we can end up with a situation
- * where the TXFIFO still has data in it... try flushing
- * it to remove anything that may still be in it.
+ * where the TXFIFO still has data in it... the docs
+ * suggest resetting all the fifos, so use the init_fifo
+ * code to relayout and flush the fifos.
*/
- if (1) {
- 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_init_fifo(hsotg);
s3c_hsotg_enqueue_setup(hsotg);
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