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USB: s3c-hsotg: Ensure FIFOs are fully flushed after layout

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According to the design guide, if the FIFO layout is changed, then the
FIFOs must be flushed to ensure all FIFO pointers are correct.

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 2010-05-25 05:36:52 +01:00 committed by Greg Kroah-Hartman
parent 2e0e0777ec
commit 1703a6d3c3
1 changed files with 26 additions and 0 deletions
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26
drivers/usb/gadget/s3c-hsotg.c
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@ -300,6 +300,7 @@ static void s3c_hsotg_init_fifo(struct s3c_hsotg *hsotg)
unsigned int ep;
unsigned int addr;
unsigned int size;
int timeout;
u32 val;
/* the ryu 2.6.24 release ahs
@ -335,6 +336,31 @@ static void s3c_hsotg_init_fifo(struct s3c_hsotg *hsotg)
writel(val, hsotg->regs + S3C_DPTXFSIZn(ep));
}
/* according to p428 of the design guide, we need to ensure that
* all fifos are flushed before continuing */
writel(S3C_GRSTCTL_TxFNum(0x10) | S3C_GRSTCTL_TxFFlsh |
S3C_GRSTCTL_RxFFlsh, hsotg->regs + S3C_GRSTCTL);
/* wait until the fifos are both flushed */
timeout = 100;
while (1) {
val = readl(hsotg->regs + S3C_GRSTCTL);
if ((val & (S3C_GRSTCTL_TxFFlsh | S3C_GRSTCTL_RxFFlsh)) == 0)
break;
if (--timeout == 0) {
dev_err(hsotg->dev,
"%s: timeout flushing fifos (GRSTCTL=%08x)\n",
__func__, val);
}
udelay(1);
}
dev_dbg(hsotg->dev, "FIFOs reset, timeout at %d\n", timeout);
}
/**