[2/2] drivers: libata-core: Use usleep_range() instead of msleep() for short sleeps (<20 ms)
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Message ID 1452230332-14926-2-git-send-email-danielwa@cisco.com
State New, archived
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Series
  • [1/2] drivers: pata_octeon_cf : Switch IO mode depending on model number
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Commit Message

Daniel Walker Jan. 8, 2016, 5:18 a.m. UTC
From: Anil Veliyankara Madam <aveliyan@cisco.com>

Since msleep() may sleep longer than intended time for values less
than 20ms, this patch allows the use of usleep_range for waits less
that 20ms. usleep_range is a finer precision implementation of
msleep and is designed to be a drop-in replacement for udelay
where a precise sleep/busy-wait is unnecessary.

More details can be found at http://lkml.org/lkml/2007/8/3/250
and in Documentation/timers/timers-howto.txt.

This change has been done to improve the performace in PIO6 mode
which is used by viking flash.

Cc: xe-kernel@external.cisco.com
Signed-off-by: Anil Veliyankara Madam <aveliyan@cisco.com>
Signed-off-by: Shikha Jain <shikjain@cisco.com>
---
 drivers/ata/libata-core.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

Comments

Tejun Heo Jan. 8, 2016, 3:36 p.m. UTC | #1
On Thu, Jan 07, 2016 at 09:18:52PM -0800, Daniel Walker wrote:
> From: Anil Veliyankara Madam <aveliyan@cisco.com>
> 
> Since msleep() may sleep longer than intended time for values less
> than 20ms, this patch allows the use of usleep_range for waits less
> that 20ms. usleep_range is a finer precision implementation of
> msleep and is designed to be a drop-in replacement for udelay
> where a precise sleep/busy-wait is unnecessary.
> 
> More details can be found at http://lkml.org/lkml/2007/8/3/250
> and in Documentation/timers/timers-howto.txt.
> 
> This change has been done to improve the performace in PIO6 mode
> which is used by viking flash.
> 
> Cc: xe-kernel@external.cisco.com
> Signed-off-by: Anil Veliyankara Madam <aveliyan@cisco.com>
> Signed-off-by: Shikha Jain <shikjain@cisco.com>

Applied to libata/for-4.5.

Thanks.

Patch
diff mbox series

diff --git a/drivers/ata/libata-core.c b/drivers/ata/libata-core.c
index b79cb10..3abf0ea 100644
--- a/drivers/ata/libata-core.c
+++ b/drivers/ata/libata-core.c
@@ -50,6 +50,7 @@ 
 #include <linux/blkdev.h>
 #include <linux/delay.h>
 #include <linux/timer.h>
+#include <linux/time.h>
 #include <linux/interrupt.h>
 #include <linux/completion.h>
 #include <linux/suspend.h>
@@ -6697,7 +6698,12 @@  void ata_msleep(struct ata_port *ap, unsigned int msecs)
 	if (owns_eh)
 		ata_eh_release(ap);
 
-	msleep(msecs);
+	if (msecs < 20) {
+		unsigned long usecs = msecs * USEC_PER_MSEC;
+		usleep_range(usecs, usecs + 50);
+	} else {
+		msleep(msecs);
+	}
 
 	if (owns_eh)
 		ata_eh_acquire(ap);