linux-kernel - Re: [PATCH] rcar-dmac: fixup descriptor pointer for descriptor mode

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Date:   Tue, 30 May 2017 11:50:05 +0530
From:   Vinod Koul <vinod.koul@...el.com>
To:     Kuninori Morimoto <kuninori.morimoto.gx@...esas.com>
Cc:     Dan Williams <dan.j.williams@...el.com>,
        Laurent Pinchart <laurent.pinchart+renesas@...asonboard.com>,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        dmaengine@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] rcar-dmac: fixup descriptor pointer for descriptor mode

On Tue, May 23, 2017 at 07:08:43AM +0000, Kuninori Morimoto wrote:
> 
> From: Kuninori Morimoto <kuninori.morimoto.gx@...esas.com>
> 
> In descriptor mode, the descriptor running pointer is not maintained
> by the interrupt handler, thus, driver finds the running descriptor
> from the descriptor pointer field in the CHCRB register.
> But, CHCRB::DPTR indicates *next* descriptor pointer, not current.
> Thus, The residue calculation will be missed. This patch fixup it.

Applied, thanks

-- 
~Vinod