From: Ian Abbott <abbotti@mev.co.uk>
To: Hartley Sweeten <HartleyS@visionengravers.com>,
"devel@driverdev.osuosl.org" <devel@driverdev.osuosl.org>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH 14/14] staging: comedi: daqboard2000: prefer usleep_range()
Date: Wed, 18 May 2016 11:28:08 +0100 [thread overview]
Message-ID: <573C43B8.2090705@mev.co.uk> (raw)
In-Reply-To: <CO2PR01MB208896729967320E963F0350D0480@CO2PR01MB2088.prod.exchangelabs.com>
On 17/05/16 18:42, Hartley Sweeten wrote:
> On Tuesday, May 17, 2016 2:53 AM, Ian Abbott wrote:
>> 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. A longer sleep would slow down firmware
>> loading, so leave it alone.
>
> The firmware blob in comedi-nonfree-firmware/daqboard2000 is
> 41236 bytes or 20618 words. With the 10 microsecond delay for
> each word to total delay time is only 0.0206 seconds. I don't think a
> small usleep_range() would slow down the firmware loading by much.
> How about usleep_range(10, 20)?
>
> Regards,
> Hartley
Okay.
--
-=( Ian Abbott @ MEV Ltd. E-mail: <abbotti@mev.co.uk> )=-
-=( Web: http://www.mev.co.uk/ )=-
next prev parent reply other threads:[~2016-05-18 10:28 UTC|newest]
Thread overview: 66+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-05-17 9:52 [PATCH 00/14] staging: comedi: daqboard2000: checkpatch clean-ups Ian Abbott
2016-05-17 9:52 ` [PATCH 01/14] staging: comedi: daqboard2000: remove commented out code Ian Abbott
2016-05-17 17:14 ` Hartley Sweeten
2016-05-18 10:21 ` Ian Abbott
2016-05-17 9:52 ` [PATCH 02/14] staging: comedi: daqboard2000: use usual block comment style Ian Abbott
2016-05-17 9:52 ` [PATCH 03/14] staging: comedi: daqboard2000: CHECK: spaces preferred around that '*' Ian Abbott
2016-05-17 9:52 ` [PATCH 04/14] staging: comedi: daqboard2000: add blank line after struct declaration Ian Abbott
2016-05-17 9:52 ` [PATCH 05/14] staging: comedi: daqboard2000: rename serial EEPROM register macros Ian Abbott
2016-05-17 17:22 ` Hartley Sweeten
2016-05-18 10:25 ` Ian Abbott
2016-05-17 9:52 ` [PATCH 06/14] staging: comedi: daqboard2000: rename register offset macros Ian Abbott
2016-05-17 17:27 ` Hartley Sweeten
2016-05-18 10:27 ` Ian Abbott
2016-05-17 9:52 ` [PATCH 07/14] staging: comedi: daqboard2000: rename acquisition control register macros Ian Abbott
2016-05-17 9:52 ` [PATCH 08/14] staging: comedi: daqboard2000: rename acq status " Ian Abbott
2016-05-17 9:52 ` [PATCH 09/14] staging: comedi: daqboard2000: redo DAC control " Ian Abbott
2016-05-17 9:52 ` [PATCH 10/14] staging: comedi: daqboard2000: redo DAC status macros and fix busy Ian Abbott
2016-05-17 9:52 ` [PATCH 11/14] staging: comedi: daqboard2000: rename trigger control register macros Ian Abbott
2016-05-17 9:52 ` [PATCH 12/14] staging: comedi: daqboard2000: rename reference DACs " Ian Abbott
2016-05-17 9:52 ` [PATCH 13/14] staging: comedi: daqboard2000: rename CamelCase functions Ian Abbott
2016-05-17 9:52 ` [PATCH 14/14] staging: comedi: daqboard2000: prefer usleep_range() Ian Abbott
2016-05-17 17:42 ` Hartley Sweeten
2016-05-18 10:28 ` Ian Abbott [this message]
2016-05-17 17:46 ` [PATCH 00/14] staging: comedi: daqboard2000: checkpatch clean-ups Hartley Sweeten
2016-05-18 12:00 ` Ian Abbott
2016-05-18 12:36 ` [PATCH v2 " Ian Abbott
2016-05-18 12:36 ` [PATCH v2 01/14] staging: comedi: daqboard2000: remove commented out code Ian Abbott
2016-05-18 12:36 ` [PATCH v2 02/14] staging: comedi: daqboard2000: use usual block comment style Ian Abbott
2016-05-18 12:36 ` [PATCH v2 03/14] staging: comedi: daqboard2000: CHECK: spaces preferred around that '*' Ian Abbott
2016-05-18 12:36 ` [PATCH v2 04/14] staging: comedi: daqboard2000: add blank line after struct declaration Ian Abbott
2016-05-18 12:37 ` [PATCH v2 05/14] staging: comedi: daqboard2000: rename serial EEPROM register macros Ian Abbott
2016-05-18 12:37 ` [PATCH v2 06/14] staging: comedi: daqboard2000: rename register offset macros Ian Abbott
2016-05-18 22:45 ` Hartley Sweeten
2016-05-19 9:55 ` [PATCH v3 " Ian Abbott
2016-05-19 16:49 ` Hartley Sweeten
2016-05-19 17:42 ` Ian Abbott
2016-05-18 12:37 ` [PATCH v2 07/14] staging: comedi: daqboard2000: rename acquisition control register macros Ian Abbott
2016-05-18 12:37 ` [PATCH v2 08/14] staging: comedi: daqboard2000: rename acq status " Ian Abbott
2016-05-18 12:37 ` [PATCH v2 09/14] staging: comedi: daqboard2000: redo DAC control " Ian Abbott
2016-05-18 12:37 ` [PATCH v2 10/14] staging: comedi: daqboard2000: redo DAC status macros and fix busy Ian Abbott
2016-05-18 12:37 ` [PATCH v2 11/14] staging: comedi: daqboard2000: rename trigger control register macros Ian Abbott
2016-05-18 12:37 ` [PATCH v2 12/14] staging: comedi: daqboard2000: rename reference DACs " Ian Abbott
2016-05-18 22:35 ` Hartley Sweeten
2016-05-19 9:58 ` [PATCH v3 " Ian Abbott
2016-05-19 10:07 ` Ian Abbott
2016-05-19 10:11 ` [PATCH v4 " Ian Abbott
2016-05-18 12:37 ` [PATCH v2 13/14] staging: comedi: daqboard2000: rename CamelCase functions Ian Abbott
2016-05-18 12:37 ` [PATCH v2 14/14] staging: comedi: daqboard2000: prefer usleep_range() Ian Abbott
2016-05-19 10:02 ` [PATCH v2 00/14] staging: comedi: daqboard2000: checkpatch clean-ups Ian Abbott
2016-05-19 10:16 ` Ian Abbott
2016-05-19 18:04 ` Ian Abbott
2016-05-19 18:15 ` [PATCH v4 " Ian Abbott
2016-05-19 18:15 ` [PATCH v4 01/14] staging: comedi: daqboard2000: remove commented out code Ian Abbott
2016-05-19 18:15 ` [PATCH v4 02/14] staging: comedi: daqboard2000: use usual block comment style Ian Abbott
2016-05-19 18:15 ` [PATCH v4 03/14] staging: comedi: daqboard2000: CHECK: spaces preferred around that '*' Ian Abbott
2016-05-19 18:15 ` [PATCH v4 04/14] staging: comedi: daqboard2000: add blank line after struct declaration Ian Abbott
2016-05-19 18:15 ` [PATCH v4 05/14] staging: comedi: daqboard2000: rename serial EEPROM register macros Ian Abbott
2016-05-19 18:15 ` [PATCH v4 06/14] staging: comedi: daqboard2000: rename register offset macros Ian Abbott
2016-05-19 18:15 ` [PATCH v4 07/14] staging: comedi: daqboard2000: rename acquisition control register macros Ian Abbott
2016-05-19 18:15 ` [PATCH v4 08/14] staging: comedi: daqboard2000: rename acq status " Ian Abbott
2016-05-19 18:15 ` [PATCH v4 09/14] staging: comedi: daqboard2000: redo DAC control " Ian Abbott
2016-05-19 18:15 ` [PATCH v4 10/14] staging: comedi: daqboard2000: redo DAC status macros and fix busy Ian Abbott
2016-05-19 18:15 ` [PATCH v4 11/14] staging: comedi: daqboard2000: rename trigger control register macros Ian Abbott
2016-05-19 18:15 ` [PATCH v4 12/14] staging: comedi: daqboard2000: rename reference DACs " Ian Abbott
2016-05-19 18:15 ` [PATCH v4 13/14] staging: comedi: daqboard2000: rename CamelCase functions Ian Abbott
2016-05-19 18:15 ` [PATCH v4 14/14] staging: comedi: daqboard2000: prefer usleep_range() Ian Abbott
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