linux-kernel - Re: [PATCH v2 4/5] dmaengine: dw-edma: HDMA: Add sync read before starting the DMA transfer in remote setup

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Message-ID: <lq7imquio2e2y4heczk27nsiutzng43cyz2sgmxa7azn3d3tnu@6hnvyzkuzhxv>
Date:   Tue, 3 Oct 2023 18:57:04 +0300
From:   Serge Semin <fancer.lancer@...il.com>
To:     Köry Maincent <kory.maincent@...tlin.com>
Cc:     Cai Huoqing <cai.huoqing@...ux.dev>,
        Manivannan Sadhasivam <mani@...nel.org>,
        Vinod Koul <vkoul@...nel.org>,
        Gustavo Pimentel <Gustavo.Pimentel@...opsys.com>,
        dmaengine@...r.kernel.org, linux-kernel@...r.kernel.org,
        Thomas Petazzoni <thomas.petazzoni@...tlin.com>,
        Herve Codina <herve.codina@...tlin.com>
Subject: Re: [PATCH v2 4/5] dmaengine: dw-edma: HDMA: Add sync read before
 starting the DMA transfer in remote setup

On Tue, Oct 03, 2023 at 05:34:32PM +0200, Köry Maincent wrote:
> On Tue, 3 Oct 2023 18:20:23 +0300
> Serge Semin <fancer.lancer@...il.com> wrote:
> 
> > On Tue, Oct 03, 2023 at 02:15:42PM +0200, Köry Maincent wrote:
> > > From: Kory Maincent <kory.maincent@...tlin.com>
> > > 
> > > The Linked list element and pointer are not stored in the same memory as
> > > the HDMA controller register. If the doorbell register is toggled before
> > > the full write of the linked list a race condition error can appears.
> > > In remote setup we can only use a readl to the memory to assured the full
> > > write has occurred.
> > > 
> > > Fixes: e74c39573d35 ("dmaengine: dw-edma: Add support for native HDMA")
> > > Signed-off-by: Kory Maincent <kory.maincent@...tlin.com>
> > > ---
> > > 
> > > Changes in v2:
> > > - Move the sync read in a function.
> > > - Add commments  
> > 
> > Note you need to resubmit the entire series if any of its part has
> > changed. So please add these patches to your patchset (in place of the
> > 4/5 and 5/5 patches I commented) and resend it as v3.
> 
> Alright.
> Should I wait for Cai's response for patch 1/5 before sending v3. He seems to
> never having woken up in our discussions.

Ok. Let's wait for Cai for sometime. We are in the middle of the
dev-cycle anyway so no reason to rush.

-Serge(y)