linux-kernel - Re: [PATCH v3 8/9] spi: rockchip: modify DMA max burst to 1

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20150903125429.GA12027@sirena.org.uk>
Date:	Thu, 3 Sep 2015 13:54:29 +0100
From:	Mark Brown <broonie@...nel.org>
To:	Shawn Lin <shawn.lin@...k-chips.com>
Cc:	Vinod Koul <vinod.koul@...el.com>,
	Heiko Stuebner <heiko@...ech.de>,
	Jaroslav Kysela <perex@...ex.cz>,
	Takashi Iwai <tiwai@...e.com>,
	Doug Anderson <dianders@...omium.org>,
	Olof Johansson <olofj@...gle.com>,
	Sonny Rao <sonnyrao@...omium.org>,
	Addy Ke <addy.ke@...k-chips.com>, dmaengine@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-rockchip@...ts.infradead.org, alsa-devel@...a-project.org,
	linux-spi@...r.kernel.org, Olof Johansson <olof@...om.net>
Subject: Re: [PATCH v3 8/9] spi: rockchip: modify DMA max burst to 1

On Tue, Sep 01, 2015 at 05:58:44PM +0800, Shawn Lin wrote:

> Generic dma controller on Rockchips' platform cannot support
> DMAFLUSHP instruction which make dma to flush the req of non-aligned
> or non-multiple of what we need. That will cause an unrecoverable
> dma bus error. The saftest way is to set dma max burst to 1.

If this is a quirk of the DMA controller why is it being fixed with a
property specific to the SPI controller?  Can't the DMA controller just
override the burst size?

> +#define ROCKCHIP_SPI_BORKEN_BURST_LEN (1<<0) /* broken burst len*/

This is misspelt.

Download attachment "signature.asc" of type "application/pgp-signature" (474 bytes)