linux-kernel - Re: [PATCH 2/2] dma: add Qualcomm Technologies HIDMA channel driver

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Date:	Tue, 03 Nov 2015 22:10:59 +0100
From:	Arnd Bergmann <arnd@...db.de>
To:	Sinan Kaya <okaya@...eaurora.org>
Cc:	dmaengine@...r.kernel.org, timur@...eaurora.org,
	cov@...eaurora.org, jcm@...hat.com,
	Rob Herring <robh+dt@...nel.org>,
	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	Vinod Koul <vinod.koul@...el.com>,
	Dan Williams <dan.j.williams@...el.com>,
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] dma: add Qualcomm Technologies HIDMA channel driver

On Tuesday 03 November 2015 16:07:34 Sinan Kaya wrote:
> On 11/3/2015 5:43 AM, Arnd Bergmann wrote:
> > Ok, got it.
> >
> > Best add an explanation like the above in the interrupt handler,
> > to prevent this from accidentally getting 'cleaned up' to use
> > readl(), or copied into a driver that uses PCI ordering rules
> > where it is actually wrong.
> >
> 
> I'm adding this disclaimer into the ISR routine.
> 
>         /*
>          * Fine tuned for this HW...
>          *
>          * This ISR has been designed for this particular hardware. Relaxed read
>          * and write accessors are used for performance reasons due to interrupt
>          * delivery guarantees. Do not copy this code blindly and expect
>          * that to work.
>          */
> 
> 

Sounds good.

	Arnd
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