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Date:   Thu, 22 Oct 2020 17:43:34 +0200
From:   Maxime Ripard <maxime@cerno.tech>
To:     Alexander Kochetkov <al.kochet@gmail.com>
Cc:     Mark Brown <broonie@kernel.org>, Chen-Yu Tsai <wens@csie.org>,
        linux-spi@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
        linux-kernel@vger.kernel.org
Subject: Re: [PATCH v3] spi: spi-sun6i: implement DMA-based transfer mode
Message-ID: <20201022154334.qqkoihzjxzdfhvce@gilmour.lan>
References: <20201022075221.23332-1-akochetkov@lintech.ru>
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On Thu, Oct 22, 2020 at 10:52:21AM +0300, Alexander Kochetkov wrote:
> From: Alexander Kochetkov <al.kochet@gmail.com>
>=20
> DMA-based transfer will be enabled if data length is larger than FIFO size
> (64 bytes for A64). This greatly reduce number of interrupts for
> transferring data.
>=20
> For smaller data size PIO mode will be used. In PIO mode whole buffer will
> be loaded into FIFO.
>=20
> If driver failed to request DMA channels then it fallback for PIO mode.
>=20
> Tested on SOPINE (https://www.pine64.org/sopine/)
>=20
> Signed-off-by: Alexander Kochetkov <al.kochet@gmail.com>

Acked-by: Maxime Ripard <mripard@kernel.org>

Thanks!
Maxime

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