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: <20231003173432.18480fa1@kmaincent-XPS-13-7390>
Date:   Tue, 3 Oct 2023 17:34:32 +0200
From:   Köry Maincent <kory.maincent@...tlin.com>
To:     Serge Semin <fancer.lancer@...il.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, 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.