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From: Amelie Delaunay <amelie.delaunay@foss.st.com>
To: Vinod Koul <vkoul@kernel.org>, Rob Herring <robh+dt@kernel.org>,
	Dan Williams <dan.j.williams@intel.com>,
	Maxime Coquelin <mcoquelin.stm32@gmail.com>,
	Alexandre Torgue <alexandre.torgue@foss.st.com>
Cc: <dmaengine@vger.kernel.org>, <devicetree@vger.kernel.org>,
	<linux-stm32@st-md-mailman.stormreply.com>,
	<linux-arm-kernel@lists.infradead.org>,
	<linux-kernel@vger.kernel.org>,
	Amelie Delaunay <amelie.delaunay@foss.st.com>,
	Pierre-Yves Mordret <pierre-yves.mordret@foss.st.com>
Subject: [RESEND PATCH 0/2] STM32 DMA alternative REQ/ACK protocol support
Date: Wed, 21 Jul 2021 13:39:44 +0200	[thread overview]
Message-ID: <20210721113946.81001-1-amelie.delaunay@foss.st.com> (raw)

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.

Amelie Delaunay (2):
  dt-bindings: dma: add alternative REQ/ACK protocol selection in
    stm32-dma
  dmaengine: stm32-dma: add alternate REQ/ACK protocol management

 Documentation/devicetree/bindings/dma/st,stm32-dma.yaml | 7 +++++++
 drivers/dma/stm32-dma.c                                 | 8 ++++++--
 2 files changed, 13 insertions(+), 2 deletions(-)

-- 
2.25.1


             reply	other threads:[~2021-07-21 12:01 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-07-21 11:39 Amelie Delaunay [this message]
2021-07-21 11:39 ` [RESEND PATCH 1/2] dt-bindings: dma: add alternative REQ/ACK protocol selection in stm32-dma Amelie Delaunay
2021-07-21 11:39 ` [RESEND PATCH 2/2] dmaengine: stm32-dma: add alternate REQ/ACK protocol management Amelie Delaunay

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