diff options
Diffstat (limited to 'include/linux')
| -rw-r--r-- | include/linux/iopoll.h | 8 |
1 files changed, 6 insertions, 2 deletions
diff --git a/include/linux/iopoll.h b/include/linux/iopoll.h index 51966d8..76d2f95 100644 --- a/include/linux/iopoll.h +++ b/include/linux/iopoll.h @@ -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) |