From mboxrd@z Thu Jan 1 00:00:00 1970 From: maxime.ripard@bootlin.com (Maxime Ripard) Date: Tue, 3 Apr 2018 10:10:41 +0200 Subject: [PATCH 2/6] spi: sun4i: restrict transfer length in PIO-mode In-Reply-To: <20180329185907.27281-3-ssuloev@orpaltech.com> References: <20180329185907.27281-1-ssuloev@orpaltech.com> <20180329185907.27281-3-ssuloev@orpaltech.com> Message-ID: <20180403081041.3ully6bcyfwx2cx6@flea> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org 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 -------------- next part -------------- A non-text attachment was scrubbed... Name: signature.asc Type: application/pgp-signature Size: 833 bytes Desc: not available URL: