From: maxime.ripard@bootlin.com (Maxime Ripard)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH 2/6] spi: sun4i: restrict transfer length in PIO-mode
Date: Tue, 3 Apr 2018 10:10:41 +0200 [thread overview]
Message-ID: <20180403081041.3ully6bcyfwx2cx6@flea> (raw)
In-Reply-To: <20180329185907.27281-3-ssuloev@orpaltech.com>
On Thu, Mar 29, 2018 at 09:59:03PM +0300, Sergey Suloev wrote:
> There is no need to handle 3/4 empty/full interrupts as the maximum
> supported transfer length in PIO mode is 64 bytes for sun4i-family
> SoCs.
That assumes that you'll be able to treat the FIFO full interrupt and
drain the FIFO before we have the next byte coming in. This would
require a real time system, and we're not in one of them.
Maxime
--
Maxime Ripard, Bootlin (formerly Free Electrons)
Embedded Linux and Kernel engineering
https://bootlin.com
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next prev parent reply other threads:[~2018-04-03 8:10 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-03-29 18:59 [PATCH 0/6] spi: Add support for DMA transfers in sun4i SPI driver Sergey Suloev
2018-03-29 18:59 ` [PATCH 1/6] spi: core: handle timeout error from transfer_one() Sergey Suloev
2018-03-29 18:59 ` [PATCH 2/6] spi: sun4i: restrict transfer length in PIO-mode Sergey Suloev
2018-04-03 8:10 ` Maxime Ripard [this message]
2018-04-03 10:26 ` Sergey Suloev
2018-04-03 11:08 ` Sergey Suloev
2018-04-03 11:40 ` Maxime Ripard
2018-04-03 12:12 ` Sergey Suloev
2018-03-29 18:59 ` [PATCH 3/6] spi: sun4i: coding style/readability improvements Sergey Suloev
2018-03-29 18:59 ` [PATCH 4/6] spi: sun4i: use completion provided by SPI core driver Sergey Suloev
2018-03-29 18:59 ` [PATCH 5/6] spi: sun4i: introduce register set/unset helpers Sergey Suloev
2018-04-03 8:14 ` Maxime Ripard
2018-04-03 10:27 ` Sergey Suloev
2018-03-29 18:59 ` [PATCH 6/6] spi: sun4i: add DMA transfers support Sergey Suloev
2018-04-03 8:17 ` Maxime Ripard
2018-04-03 13:03 ` Sergey Suloev
2018-04-04 6:27 ` Maxime Ripard
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