linux-kernel - Re: [PATCH 0/2] STM32 DMA alternative REQ/ACK protocol support

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Message-ID: <YQECxSZqa9aHw6CB@matsya>
Date:   Wed, 28 Jul 2021 12:39:57 +0530
From:   Vinod Koul <vkoul@...nel.org>
To:     Amelie Delaunay <amelie.delaunay@...s.st.com>
Cc:     Rob Herring <robh+dt@...nel.org>,
        Dan Williams <dan.j.williams@...el.com>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        Alexandre Torgue <alexandre.torgue@...s.st.com>,
        dmaengine@...r.kernel.org, devicetree@...r.kernel.org,
        linux-stm32@...md-mailman.stormreply.com,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Pierre-Yves Mordret <pierre-yves.mordret@...s.st.com>
Subject: Re: [PATCH 0/2] STM32 DMA alternative REQ/ACK protocol support

On 24-06-21, 11:39, Amelie Delaunay wrote:
> Default REQ/ACK protocol consists in maintaining ACK signal up to the
> removal of REQuest and the transfer completion.
> In case of alternative REQ/ACK protocol, ACK de-assertion does not wait the
> removal of the REQuest, but only the transfer completion.
> Due to a possible DMA stream lock when transferring data to/from STM32
> USART/UART, add support to select alternative REQ/ACK protocol.

Applied, thanks

-- 
~Vinod