linux-kernel - Re: [PATCH v2 0/7] of: setup dma parameters using dma-ranges and dma-coherent

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Message-ID: <CAL_JsqJktpEBE1rAXDKX8uNSrWzgP1Scucvzrtw0auQSC=SO_g@mail.gmail.com>
Date:	Tue, 22 Apr 2014 10:30:36 -0500
From:	Rob Herring <robherring2@...il.com>
To:	Catalin Marinas <catalin.marinas@....com>
Cc:	Arnd Bergmann <arnd@...db.de>,
	Thomas Petazzoni <thomas.petazzoni@...e-electrons.com>,
	Santosh Shilimkar <santosh.shilimkar@...com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	Grygorii Strashko <grygorii.strashko@...com>,
	Russell King <linux@....linux.org.uk>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Linus Walleij <linus.walleij@...aro.org>,
	"grant.likely@...aro.org" <grant.likely@...aro.org>,
	Rob Herring <robh+dt@...nel.org>,
	Olof Johansson <olof@...om.net>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	Gregory Clément 
	<gregory.clement@...e-electrons.com>,
	Ezequiel Garcia <ezequiel.garcia@...e-electrons.com>,
	Lior Amsalem <alior@...vell.com>,
	Tawfik Bayouk <tawfik@...vell.com>
Subject: Re: [PATCH v2 0/7] of: setup dma parameters using dma-ranges and dma-coherent

On Tue, Apr 22, 2014 at 10:25 AM, Catalin Marinas
<catalin.marinas@....com> wrote:
> On Tue, Apr 22, 2014 at 04:02:19PM +0100, Arnd Bergmann wrote:
>> On Saturday 19 April 2014, Thomas Petazzoni wrote:

[...]

>> I would hope we can find a way to avoid the platform notifiers for
>> mvebu as well and come up with a generic way to express this
>> 'semi-coherent' mode. I believe x-gene has a similar issue, and
>> I wouldn't be surprised if there are others like this.
>
> The solution is for the snooping unit to detect the DSB instruction
> (which is propagated outside the CPU) and wait for the completion of the
> coherency work (but we need more information from the hardware guys).

If the solution was fixing broken h/w, we'd all be retired (or h/w
designers). :)

Rob
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