#ifndef __ASM_GENERIC_DELAY_H
#define __ASM_GENERIC_DELAY_H

/* Undefined functions to get compile-time errors */
extern void __bad_udelay(void);
extern void __bad_ndelay(void);

extern void __udelay(unsigned long usecs);
extern void __ndelay(unsigned long nsecs);
extern void __const_udelay(unsigned long xloops);
extern void __delay(unsigned long loops);

/*
 * The weird n/20000 thing suppresses a "comparison is always false due to
 * limited range of data type" warning with non-const 8-bit arguments.
 */

/* 0x10c7 is 2**32 / 1000000 (rounded up) */
#define udelay(n)							\
	({								\
		if (__builtin_constant_p(n)) {				\
			if ((n) / 20000 >= 1)				\
				 __bad_udelay();			\
			else						\
				__const_udelay((n) * 0x10c7ul);		\
		} else {						\
			__udelay(n);					\
		}							\
	})

/* 0x5 is 2**32 / 1000000000 (rounded up) */
#define ndelay(n)							\
	({								\
		if (__builtin_constant_p(n)) {				\
			if ((n) / 20000 >= 1)				\
				__bad_ndelay();				\
			else						\
				__const_udelay((n) * 5ul);		\
		} else {						\
			__ndelay(n);					\
		}							\
	})

#endif /* __ASM_GENERIC_DELAY_H */
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<tr><th>author</th><td>Yoshihiro Shimoda &lt;yoshihiro.shimoda.uh@renesas.com&gt;</td><td class='right'>2016-05-31 21:47:17 +0900</td></tr>
<tr><th>committer</th><td>Kishon Vijay Abraham I &lt;kishon@ti.com&gt;</td><td class='right'>2016-06-17 18:25:48 +0530</td></tr>
<tr><th>commit</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/?id=6762925df4642aec5629f7971ba477d6930f53f7'>6762925df4642aec5629f7971ba477d6930f53f7</a> (<a href='/cgit.cgi/linux/net-next.git/patch/?id=6762925df4642aec5629f7971ba477d6930f53f7'>patch</a>)</td></tr>
<tr><th>tree</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/tree/?id=6762925df4642aec5629f7971ba477d6930f53f7'>6fa5ac63e1fe8515a03fa1731792d8ec03de555c</a></td></tr>
<tr><th>parent</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/?id=31b2a32f708bb33b3f35b03ce3d2cb31f7d1e684'>31b2a32f708bb33b3f35b03ce3d2cb31f7d1e684</a> (<a href='/cgit.cgi/linux/net-next.git/diff/?id=6762925df4642aec5629f7971ba477d6930f53f7&amp;id2=31b2a32f708bb33b3f35b03ce3d2cb31f7d1e684'>diff</a>)</td></tr></table>
<div class='commit-subject'>phy: rcar-gen3-usb2: fix unexpected repeat interrupts of VBUS change</div><div class='commit-msg'>This patch fixes an issue that the driver is possible to cause
unexpected repeat interrupts if a board condition is wrong
(e.g. even if the ID pin is as function, a board supplies the VBUS.)

The reason why unexpected repeat interrupts happen is:
 1) The driver changed the mode to function if it detected the ID pin
    is high and the VBUS is high.
 2) After the driver changed function mode, it disabled the "VBUS control"
    feature. Then, the VBUS signal will be low.
 3) Since the VBUS change interruption happened, the driver checked
    the ID pin and VBUS.
 4) Since VBUS was low, the driver changed the mode to host and enabled
    the "VBUS control" feature. Then the VBUS signal will be high.
 5) Since the VBUS change interruption happened, the driver did 1) above.

So, this patch modified the condition in rcar_gen3_device_recognition()
to check the ID pin only.

Fixes: 1114e2d (phy: rcar-gen3-usb2: change the mode to OTG on the combined channel)
Cc: &lt;stable@vger.kernel.org&gt; # v4.5+
Reported-by: Simon Horman &lt;horms@verge.net.au&gt;
Signed-off-by: Yoshihiro Shimoda &lt;yoshihiro.shimoda.uh@renesas.com&gt;
Signed-off-by: Kishon Vijay Abraham I &lt;kishon@ti.com&gt;
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