From: Mark Brown <broonie-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>
To: Martin Sperl <kernel-TqfNSX0MhmxHKSADF0wUEw@public.gmane.org>
Cc: Stephen Warren <swarren-3lzwWm7+Weoh9ZMKESR00Q@public.gmane.org>,
lee-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org,
linux-spi-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
linux-rpi-kernel
<linux-rpi-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org>
Subject: Re: [PATCH 3/6] spi: bcm2835: fill FIFO before enabling interrupts to
Date: Tue, 7 Apr 2015 19:23:27 +0100 [thread overview]
Message-ID: <20150407182327.GP6023@sirena.org.uk> (raw)
In-Reply-To: <BD11C8AC-F517-4120-BBD6-07618EE86604-TqfNSX0MhmxHKSADF0wUEw@public.gmane.org>
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On Tue, Apr 07, 2015 at 08:18:57PM +0200, Martin Sperl wrote:
> > On 07.04.2015, at 19:40, Mark Brown <broonie-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org> wrote:
> > For your workload perhaps. For some workloads they are very common
> > (register reads are the most obvious example, they are typically a write
> > transfer to provide the register address followed by a read transfer for
> > the data).
> Which spi_write_then_read collapses into a single transfer.
No it doesn't. It creates a single message with two transfers (which is
what I'd expect any user doing this to do, there are others that don't
use the SPI helper APIs).
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next prev parent reply other threads:[~2015-04-07 18:23 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-03-29 14:03 [PATCH 3/6] spi: bcm2835: fill FIFO before enabling interrupts to Martin Sperl
[not found] ` <3628E5E2-7EA9-488F-AF5F-A2E43D2D1E3E-TqfNSX0MhmxHKSADF0wUEw@public.gmane.org>
2015-03-29 16:55 ` Mark Brown
2015-03-31 3:16 ` Stephen Warren
[not found] ` <551A1185.6060502-3lzwWm7+Weoh9ZMKESR00Q@public.gmane.org>
2015-03-31 5:25 ` Mark Brown
[not found] ` <20150331052519.GZ2869-GFdadSzt00ze9xe1eoZjHA@public.gmane.org>
2015-04-05 1:49 ` Stephen Warren
[not found] ` <552094B5.3050109-3lzwWm7+Weoh9ZMKESR00Q@public.gmane.org>
2015-04-06 17:21 ` Mark Brown
[not found] ` <20150406172130.GU6023-GFdadSzt00ze9xe1eoZjHA@public.gmane.org>
2015-04-07 6:25 ` Martin Sperl
[not found] ` <B9B4E3CA-D9F2-4A79-BC78-C3BD4B3844F2-TqfNSX0MhmxHKSADF0wUEw@public.gmane.org>
2015-04-07 6:43 ` Martin Sperl
2015-04-07 15:39 ` Stephen Warren
[not found] ` <5523FA17.6040009-3lzwWm7+Weoh9ZMKESR00Q@public.gmane.org>
2015-04-07 16:28 ` Mark Brown
[not found] ` <20150407162857.GM6023-GFdadSzt00ze9xe1eoZjHA@public.gmane.org>
2015-04-08 9:41 ` Martin Sperl
2015-04-07 17:05 ` Martin Sperl
[not found] ` <1BAEDC46-354E-49F4-BC6A-6AA5C1A4A1B4-TqfNSX0MhmxHKSADF0wUEw@public.gmane.org>
2015-04-07 17:40 ` Mark Brown
[not found] ` <20150407174003.GN6023-GFdadSzt00ze9xe1eoZjHA@public.gmane.org>
2015-04-07 18:18 ` Martin Sperl
[not found] ` <BD11C8AC-F517-4120-BBD6-07618EE86604-TqfNSX0MhmxHKSADF0wUEw@public.gmane.org>
2015-04-07 18:23 ` Mark Brown [this message]
[not found] ` <20150407182327.GP6023-GFdadSzt00ze9xe1eoZjHA@public.gmane.org>
2015-04-07 20:28 ` Martin Sperl
2015-04-08 2:01 ` Stephen Warren
[not found] ` <55248C07.8070903-3lzwWm7+Weoh9ZMKESR00Q@public.gmane.org>
2015-04-08 7:14 ` Martin Sperl
2015-03-31 5:51 ` Martin Sperl
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