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usb: udc: net2280: convert to readl_poll_timeout_atomic() 

Use readl_poll_timeout_atomic() to simplify code

Cc: Alan Stern <stern@rowland.harvard.edu>
Cc: Felipe Balbi <balbi@kernel.org>
Acked-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Chunfeng Yun <chunfeng.yun@mediatek.com>
Link: https://lore.kernel.org/r/1600668815-12135-10-git-send-email-chunfeng.yun@mediatek.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Chunfeng Yun 2020-09-21 14:13:34 +08:00 committed by Greg Kroah-Hartman
parent f158afecff
commit 805ca9c2c2
1 changed files with 10 additions and 11 deletions
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21
drivers/usb/gadget/udc/net2280.c
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@ -52,6 +52,7 @@
#include <linux/usb/gadget.h>
#include <linux/prefetch.h>
#include <linux/io.h>
#include <linux/iopoll.h>
#include <asm/byteorder.h>
#include <asm/irq.h>
@ -360,18 +361,16 @@ net2280_enable(struct usb_ep *_ep, const struct usb_endpoint_descriptor *desc)
static int handshake(u32 __iomem *ptr, u32 mask, u32 done, int usec)
{
u32 result;
int ret;
do {
result = readl(ptr);
if (result == ~(u32)0) /* "device unplugged" */
return -ENODEV;
result &= mask;
if (result == done)
return 0;
udelay(1);
usec--;
} while (usec > 0);
return -ETIMEDOUT;
ret = readl_poll_timeout_atomic(ptr, result,
((result & mask) == done ||
result == U32_MAX),
1, usec);
if (result == U32_MAX) /* device unplugged */
return -ENODEV;
return ret;
}
static const struct usb_ep_ops net2280_ep_ops;