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Groups > linux.kernel > #1402941
| From | Ian Abbott <abbotti@mev.co.uk> |
|---|---|
| Newsgroups | linux.kernel |
| Subject | [PATCH v2 14/14] staging: comedi: daqboard2000: prefer usleep_range() |
| Date | 2016-05-18 14:40 +0200 |
| Message-ID | <rA8VA-2a6-29@gated-at.bofh.it> (permalink) |
| References | <rzJXb-2UD-3@gated-at.bofh.it> <rA8Vz-2a6-5@gated-at.bofh.it> |
| Organization | linux.* mail to news gateway |
The checkpatch.pl warns about two `udelay(x)` calls, one of 100
microseconds, and one of 10 microseconds. The 100 microseconds one is
used when waiting for FPGA to become ready to accept firmware, and is
not that critical, so replace it with a call to `usleep_range(100,
1000)`. The 10 microseconds one is called as each 16-bit word of
firmware data is written. Replace it with a fairly tight
`usleep_range(10, 20)` to avoid slowing down firmware loading too much.
The firmware is fairly short, so this would only slow it down firmware
loading by about 20 milliseconds or so.
Signed-off-by: Ian Abbott <abbotti@mev.co.uk>
Reviewed-by: H Hartley Sweeten <hsweeten@visionengravers.com>
---
v2: Replaced the 10 microsecond udelay with a fairly tight usleep_range,
as suggested by Hartley.
---
drivers/staging/comedi/drivers/daqboard2000.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/drivers/staging/comedi/drivers/daqboard2000.c b/drivers/staging/comedi/drivers/daqboard2000.c
index 856ed1cb..fa41799 100644
--- a/drivers/staging/comedi/drivers/daqboard2000.c
+++ b/drivers/staging/comedi/drivers/daqboard2000.c
@@ -476,7 +476,7 @@ static int daqboard2000_poll_cpld(struct comedi_device *dev, int mask)
result = 1;
break;
}
- udelay(100);
+ usleep_range(100, 1000);
}
udelay(5);
return result;
@@ -486,7 +486,7 @@ static int daqboard2000_write_cpld(struct comedi_device *dev, int data)
{
int result = 0;
- udelay(10);
+ usleep_range(10, 20);
writew(data, dev->mmio + 0x1000);
if ((readw(dev->mmio + 0x1000) & DAQBOARD2000_CPLD_INIT) ==
DAQBOARD2000_CPLD_INIT) {
--
2.8.1
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[PATCH 00/14] staging: comedi: daqboard2000: checkpatch clean-ups Ian Abbott <abbotti@mev.co.uk> - 2016-05-17 12:00 +0200
[PATCH 07/14] staging: comedi: daqboard2000: rename acquisition control register macros Ian Abbott <abbotti@mev.co.uk> - 2016-05-17 12:00 +0200
[PATCH 14/14] staging: comedi: daqboard2000: prefer usleep_range() Ian Abbott <abbotti@mev.co.uk> - 2016-05-17 12:00 +0200
RE: [PATCH 14/14] staging: comedi: daqboard2000: prefer usleep_range() Hartley Sweeten <HartleyS@visionengravers.com> - 2016-05-17 19:50 +0200
Re: [PATCH 14/14] staging: comedi: daqboard2000: prefer usleep_range() Ian Abbott <abbotti@mev.co.uk> - 2016-05-18 12:30 +0200
RE: [PATCH 00/14] staging: comedi: daqboard2000: checkpatch clean-ups Hartley Sweeten <HartleyS@visionengravers.com> - 2016-05-17 20:10 +0200
Re: [PATCH 00/14] staging: comedi: daqboard2000: checkpatch clean-ups Ian Abbott <abbotti@mev.co.uk> - 2016-05-18 14:10 +0200
[PATCH v2 10/14] staging: comedi: daqboard2000: redo DAC status macros and fix busy Ian Abbott <abbotti@mev.co.uk> - 2016-05-18 14:40 +0200
[PATCH v2 06/14] staging: comedi: daqboard2000: rename register offset macros Ian Abbott <abbotti@mev.co.uk> - 2016-05-18 14:40 +0200
RE: [PATCH v2 06/14] staging: comedi: daqboard2000: rename register offset macros Hartley Sweeten <HartleyS@visionengravers.com> - 2016-05-19 00:50 +0200
[PATCH v3 06/14] staging: comedi: daqboard2000: rename register offset macros Ian Abbott <abbotti@mev.co.uk> - 2016-05-19 12:00 +0200
RE: [PATCH v3 06/14] staging: comedi: daqboard2000: rename register offset macros Hartley Sweeten <HartleyS@visionengravers.com> - 2016-05-19 18:50 +0200
Re: [PATCH v3 06/14] staging: comedi: daqboard2000: rename register offset macros Ian Abbott <abbotti@mev.co.uk> - 2016-05-19 19:50 +0200
[PATCH v2 11/14] staging: comedi: daqboard2000: rename trigger control register macros Ian Abbott <abbotti@mev.co.uk> - 2016-05-18 14:40 +0200
[PATCH v2 08/14] staging: comedi: daqboard2000: rename acq status register macros Ian Abbott <abbotti@mev.co.uk> - 2016-05-18 14:40 +0200
[PATCH v2 07/14] staging: comedi: daqboard2000: rename acquisition control register macros Ian Abbott <abbotti@mev.co.uk> - 2016-05-18 14:40 +0200
[PATCH v2 09/14] staging: comedi: daqboard2000: redo DAC control register macros Ian Abbott <abbotti@mev.co.uk> - 2016-05-18 14:40 +0200
[PATCH v2 04/14] staging: comedi: daqboard2000: add blank line after struct declaration Ian Abbott <abbotti@mev.co.uk> - 2016-05-18 14:40 +0200
[PATCH v2 12/14] staging: comedi: daqboard2000: rename reference DACs register macros Ian Abbott <abbotti@mev.co.uk> - 2016-05-18 14:40 +0200
RE: [PATCH v2 12/14] staging: comedi: daqboard2000: rename reference DACs register macros Hartley Sweeten <HartleyS@visionengravers.com> - 2016-05-19 01:00 +0200
[PATCH v3 12/14] staging: comedi: daqboard2000: rename reference DACs register macros Ian Abbott <abbotti@mev.co.uk> - 2016-05-19 12:00 +0200
Re: [PATCH v3 12/14] staging: comedi: daqboard2000: rename reference DACs register macros Ian Abbott <abbotti@mev.co.uk> - 2016-05-19 12:10 +0200
[PATCH v4 12/14] staging: comedi: daqboard2000: rename reference DACs register macros Ian Abbott <abbotti@mev.co.uk> - 2016-05-19 12:20 +0200
[PATCH v2 02/14] staging: comedi: daqboard2000: use usual block comment style Ian Abbott <abbotti@mev.co.uk> - 2016-05-18 14:40 +0200
[PATCH v2 14/14] staging: comedi: daqboard2000: prefer usleep_range() Ian Abbott <abbotti@mev.co.uk> - 2016-05-18 14:40 +0200
[PATCH v2 13/14] staging: comedi: daqboard2000: rename CamelCase functions Ian Abbott <abbotti@mev.co.uk> - 2016-05-18 14:40 +0200
[PATCH v2 05/14] staging: comedi: daqboard2000: rename serial EEPROM register macros Ian Abbott <abbotti@mev.co.uk> - 2016-05-18 14:50 +0200
[PATCH v2 03/14] staging: comedi: daqboard2000: CHECK: spaces preferred around that '*' Ian Abbott <abbotti@mev.co.uk> - 2016-05-18 14:50 +0200
[PATCH v2 00/14] staging: comedi: daqboard2000: checkpatch clean-ups Ian Abbott <abbotti@mev.co.uk> - 2016-05-18 14:50 +0200
[PATCH v2 01/14] staging: comedi: daqboard2000: remove commented out code Ian Abbott <abbotti@mev.co.uk> - 2016-05-18 14:50 +0200
Re: [PATCH v2 00/14] staging: comedi: daqboard2000: checkpatch clean-ups Ian Abbott <abbotti@mev.co.uk> - 2016-05-19 12:10 +0200
Re: [PATCH v2 00/14] staging: comedi: daqboard2000: checkpatch clean-ups Ian Abbott <abbotti@mev.co.uk> - 2016-05-19 12:20 +0200
Re: [PATCH v2 00/14] staging: comedi: daqboard2000: checkpatch clean-ups Ian Abbott <abbotti@mev.co.uk> - 2016-05-19 20:10 +0200
[PATCH v4 00/14] staging: comedi: daqboard2000: checkpatch clean-ups Ian Abbott <abbotti@mev.co.uk> - 2016-05-19 20:20 +0200
[PATCH v4 11/14] staging: comedi: daqboard2000: rename trigger control register macros Ian Abbott <abbotti@mev.co.uk> - 2016-05-19 20:20 +0200
[PATCH v4 03/14] staging: comedi: daqboard2000: CHECK: spaces preferred around that '*' Ian Abbott <abbotti@mev.co.uk> - 2016-05-19 20:20 +0200
[PATCH v4 04/14] staging: comedi: daqboard2000: add blank line after struct declaration Ian Abbott <abbotti@mev.co.uk> - 2016-05-19 20:20 +0200
[PATCH v4 01/14] staging: comedi: daqboard2000: remove commented out code Ian Abbott <abbotti@mev.co.uk> - 2016-05-19 20:20 +0200
[PATCH v4 07/14] staging: comedi: daqboard2000: rename acquisition control register macros Ian Abbott <abbotti@mev.co.uk> - 2016-05-19 20:20 +0200
[PATCH v4 08/14] staging: comedi: daqboard2000: rename acq status register macros Ian Abbott <abbotti@mev.co.uk> - 2016-05-19 20:20 +0200
[PATCH v4 10/14] staging: comedi: daqboard2000: redo DAC status macros and fix busy Ian Abbott <abbotti@mev.co.uk> - 2016-05-19 20:20 +0200
[PATCH v4 14/14] staging: comedi: daqboard2000: prefer usleep_range() Ian Abbott <abbotti@mev.co.uk> - 2016-05-19 20:20 +0200
[PATCH v4 06/14] staging: comedi: daqboard2000: rename register offset macros Ian Abbott <abbotti@mev.co.uk> - 2016-05-19 20:20 +0200
[PATCH v4 12/14] staging: comedi: daqboard2000: rename reference DACs register macros Ian Abbott <abbotti@mev.co.uk> - 2016-05-19 20:20 +0200
[PATCH v4 13/14] staging: comedi: daqboard2000: rename CamelCase functions Ian Abbott <abbotti@mev.co.uk> - 2016-05-19 20:20 +0200
[PATCH v4 09/14] staging: comedi: daqboard2000: redo DAC control register macros Ian Abbott <abbotti@mev.co.uk> - 2016-05-19 20:20 +0200
[PATCH v4 02/14] staging: comedi: daqboard2000: use usual block comment style Ian Abbott <abbotti@mev.co.uk> - 2016-05-19 20:20 +0200
[PATCH v4 05/14] staging: comedi: daqboard2000: rename serial EEPROM register macros Ian Abbott <abbotti@mev.co.uk> - 2016-05-19 20:20 +0200
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