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iopoll: Add dealy to read poll

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Some drivers and other bsp code not only poll the
register with timeout but also required to delay
on each transaction.

This patch add that requirement by adding sleep_us
variable so-that read_poll_timeout now support
delay as well.

This change is referenced from Linux from below commit:
commit <5f5323a14cad19323060a8cbf9d96f2280a462dd> ("iopoll:
introduce read_poll_timeout macro")

Signed-off-by: Jagan Teki <jagan@amarulasolutions.com>
This commit is contained in:
Jagan Teki 2020-05-02 12:45:02 +05:30
parent 54232474d6
commit c094e219a8
1 changed files with 6 additions and 2 deletions
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8
include/linux/iopoll.h
View file

@ -6,6 +6,7 @@
#ifndef _LINUX_IOPOLL_H
#define _LINUX_IOPOLL_H
#include <linux/delay.h>
#include <linux/errno.h>
#include <linux/io.h>
#include <time.h>
@ -16,6 +17,7 @@
* @addr: Address to poll
* @val: Variable to read the value into
* @cond: Break condition (usually involving @val)
* @sleep_us: Maximum time to sleep in us
* @timeout_us: Timeout in us, 0 means never timeout
*
* Returns 0 on success and -ETIMEDOUT upon a timeout. In either
@ -24,7 +26,7 @@
* When available, you'll probably want to use one of the specialized
* macros defined below rather than this macro directly.
*/
#define read_poll_timeout(op, addr, val, cond, timeout_us) \
#define read_poll_timeout(op, addr, val, cond, sleep_us, timeout_us) \
({ \
unsigned long timeout = timer_get_us() + timeout_us; \
for (;;) { \
@ -35,12 +37,14 @@
(val) = op(addr); \
break; \
} \
if (sleep_us) \
udelay(sleep_us); \
} \
(cond) ? 0 : -ETIMEDOUT; \
})
#define readx_poll_timeout(op, addr, val, cond, timeout_us) \
read_poll_timeout(op, addr, val, cond, timeout_us)
read_poll_timeout(op, addr, val, cond, false, timeout_us)
#define readb_poll_timeout(addr, val, cond, timeout_us) \
readx_poll_timeout(readb, addr, val, cond, timeout_us)