linux-kernel - Re: [PATCH] dmaengine: nbpfaxi: add optional max-burst property for memory reads/writes

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Message-ID: <20161114043834.GP3000@localhost>
Date:   Mon, 14 Nov 2016 10:08:34 +0530
From:   Vinod Koul <vinod.koul@...el.com>
To:     Niklas Cassel <niklas.cassel@...s.com>
Cc:     robh+dt@...nel.org, mark.rutland@....com, dan.j.williams@...el.com,
        dmaengine@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, Niklas Cassel <niklass@...s.com>
Subject: Re: [PATCH] dmaengine: nbpfaxi: add optional max-burst property for
 memory reads/writes

On Mon, Oct 24, 2016 at 03:29:15PM +0200, Niklas Cassel wrote:
> From: Niklas Cassel <niklas.cassel@...s.com>
> 
> Due to a hardware bug, reading memory (from the Accelerator Coherency Port)
> with a burst size equal to the maximum burst size allowed by the DMA
> hardware's buffer size will cause a hardware hang on the ARTPEC-6 SoC,
> where the only solution is a manual power cycle.
> On ARTPEC-6, this hardware bug does not trigger when writing memory (to the
> Accelerator Coherency Port) with a burst size equal to the maximum burst
> size allowed by the DMA hardware's buffer size.
> 
> To avoid this hardware hang, introduce a new optional max-burst property
> for memory reads. For completeness, also introduce a max-burst property for
> memory writes.

Applied, thanks

-- 
~Vinod