linux-kernel - Re: [PATCH v3] dmaengine: rcar-dmac: use TCRB instead of TCR for residue

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Message-ID: <878tfqzov2.wl%kuninori.morimoto.gx@renesas.com>
Date:   Wed, 1 Nov 2017 03:07:09 +0000
From:   Kuninori Morimoto <kuninori.morimoto.gx@...esas.com>
To:     Vinod Koul <vinod.koul@...el.com>
Cc:     Geert Uytterhoeven <geert@...ux-m68k.org>,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        Dan Williams <dan.j.williams@...el.com>,
        Niklas Söderlund 
        <niklas.soderlund+renesas@...natech.se>,
        <dmaengine@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Hiroyuki Yokoyama <hiroyuki.yokoyama.vx@...esas.com>,
        Linux-Renesas <linux-renesas-soc@...r.kernel.org>
Subject: Re: [PATCH v3] dmaengine: rcar-dmac: use TCRB instead of TCR for residue


Hi Geert, Vinod

Geert, thank you for your report,
Vinod, thank you for your quick help.

> > > This is now commit 847449f23dcbff68 ("dmaengine: rcar-dmac: use TCRB
> > > instead of TCR for residue") in slave-dma/next, and breaks serial console
> > > input on koelsch (shmobile_defconfig) and salvator-x (renesas_defconfig).
> > > Reverting that commit fixes the issue for me.

This patch solved my issue (= sound noise), but it is transferring
large size data. From "transferring data size" point of view,
my sound situation is same as your large serial console input situation?

I will ask this to HW guys.
Thanks

Best regards
---
Kuninori Morimoto