linux-kernel - Re: [PATCH] i2c: designware: use {readl|writel}

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: <20150113162812.GA2227@tarshish>
Date:	Tue, 13 Jan 2015 18:28:12 +0200
From:	Baruch Siach <baruch@...s.co.il>
To:	Wolfram Sang <wsa@...-dreams.de>
Cc:	Jisheng Zhang <jszhang@...vell.com>, linux-i2c@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] i2c: designware: use {readl|writel}_relaxed instead of
 readl/writel

Hi Wolfram,

On Tue, Jan 13, 2015 at 03:36:54PM +0100, Wolfram Sang wrote:
> > The driver does not perform DMA, so it's safe to use the relaxed version.
> > From another side, the relaxed io accessor macros are available on all
> > architectures now, so we can use the relaxed versions instead.
> 
> Can the designware core make use of DMA in theory?

According to the "DesignWare DW_apb_i2c Databook" version I have it can 
(optionally).

baruch

-- 
     http://baruch.siach.name/blog/                  ~. .~   Tk Open Systems
=}------------------------------------------------ooO--U--Ooo------------{=
   - baruch@...s.co.il - tel: +972.2.679.5364, http://www.tkos.co.il -
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/