From: kernel-TqfNSX0MhmxHKSADF0wUEw@public.gmane.org
To: Mark Brown <broonie-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>
Cc: linux-spi-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
linux-rpi-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org,
linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org
Subject: Re: [PATCH V2 5/6] spi: bcm2835: make the lower limit for dma mode configurable
Date: Wed, 8 May 2019 12:55:32 +0200 [thread overview]
Message-ID: <CE110436-866D-44F4-B8A5-F7D02DD06F70@martin.sperl.org> (raw)
In-Reply-To: <20190508084205.GD14916-GFdadSzt00ze9xe1eoZjHA@public.gmane.org>
> On 08.05.2019, at 10:42, Mark Brown <broonie-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org> wrote:
>
> especially with the ATMega case where we want fast individual clocks but
> lots of dead space in between bytes (is the controller capable of adding
> that dead space itself in DMA mode BTW?).
No it is not - at least not so far as I know of (and I just went over the
available documentation again).
Martin
WARNING: multiple messages have this Message-ID (diff)
From: kernel@martin.sperl.org
To: Mark Brown <broonie@kernel.org>
Cc: Stefan Wahren <stefan.wahren@i2se.com>,
linux-spi@vger.kernel.org, Eric Anholt <eric@anholt.net>,
Lukas Wunner <lukas@wunner.de>,
linux-rpi-kernel@lists.infradead.org,
linux-arm-kernel@lists.infradead.org
Subject: Re: [PATCH V2 5/6] spi: bcm2835: make the lower limit for dma mode configurable
Date: Wed, 8 May 2019 12:55:32 +0200 [thread overview]
Message-ID: <CE110436-866D-44F4-B8A5-F7D02DD06F70@martin.sperl.org> (raw)
In-Reply-To: <20190508084205.GD14916@sirena.org.uk>
> On 08.05.2019, at 10:42, Mark Brown <broonie@kernel.org> wrote:
>
> especially with the ATMega case where we want fast individual clocks but
> lots of dead space in between bytes (is the controller capable of adding
> that dead space itself in DMA mode BTW?).
No it is not - at least not so far as I know of (and I just went over the
available documentation again).
Martin
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next prev parent reply other threads:[~2019-05-08 10:55 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-04-23 20:15 [PATCH V2 0/6] spi: bcm2835: improvements kernel
2019-04-23 20:15 ` kernel
2019-04-23 20:15 ` [PATCH V2 2/6] spi: bcm2835: Avoid 64-bit arithmetic in xfer len calc kernel
2019-04-23 20:15 ` kernel
2019-05-08 9:08 ` Applied "spi: bcm2835: Avoid 64-bit arithmetic in xfer len calc" to the spi tree Mark Brown
2019-05-08 9:08 ` Mark Brown
[not found] ` <20190423201513.8073-1-kernel-TqfNSX0MhmxHKSADF0wUEw@public.gmane.org>
2019-04-23 20:15 ` [PATCH V2 1/6] spi: bcm2835: bcm2835_spi_transfer_one_poll remove unnecessary argument kernel-TqfNSX0MhmxHKSADF0wUEw
2019-04-23 20:15 ` kernel
2019-05-08 8:26 ` Mark Brown
[not found] ` <20190423201513.8073-2-kernel-TqfNSX0MhmxHKSADF0wUEw@public.gmane.org>
2019-05-08 9:08 ` Applied "spi: bcm2835: bcm2835_spi_transfer_one_poll remove unnecessary argument" to the spi tree Mark Brown
2019-05-08 9:08 ` Mark Brown
2019-04-23 20:15 ` [PATCH V2 3/6] spi: bcm2835: added comment about different bus behaviour of DMA mode kernel-TqfNSX0MhmxHKSADF0wUEw
2019-04-23 20:15 ` kernel
2019-05-08 9:08 ` Applied "spi: bcm2835: added comment about different bus behaviour of DMA mode" to the spi tree Mark Brown
2019-05-08 9:08 ` Mark Brown
2019-04-23 20:15 ` [PATCH V2 4/6] spi: bcm2835: make the polling duration limits configurable kernel-TqfNSX0MhmxHKSADF0wUEw
2019-04-23 20:15 ` kernel
2019-05-08 9:08 ` Applied "spi: bcm2835: make the polling duration limits configurable" to the spi tree Mark Brown
2019-05-08 9:08 ` Mark Brown
2019-04-23 20:15 ` [PATCH V2 5/6] spi: bcm2835: make the lower limit for dma mode configurable kernel-TqfNSX0MhmxHKSADF0wUEw
2019-04-23 20:15 ` kernel
[not found] ` <20190424070712.hh6ozvhkvkxhwak3@wunner.de>
2019-05-08 8:42 ` Mark Brown
[not found] ` <20190508084205.GD14916-GFdadSzt00ze9xe1eoZjHA@public.gmane.org>
2019-05-08 10:55 ` kernel-TqfNSX0MhmxHKSADF0wUEw [this message]
2019-05-08 10:55 ` kernel
2019-04-23 20:15 ` [PATCH V2 6/6] spi: bcm2835: add driver stats to debugfs kernel-TqfNSX0MhmxHKSADF0wUEw
2019-04-23 20:15 ` kernel
2019-05-08 9:08 ` Applied "spi: bcm2835: add driver stats to debugfs" to the spi tree Mark Brown
2019-05-08 9:08 ` Mark Brown
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