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
Date: Thu, 22 Oct 2020 17:43:34 +0200 [thread overview]
Message-ID: <20201022154334.qqkoihzjxzdfhvce@gilmour.lan> (raw)
In-Reply-To: <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>
>
> 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.
>
> For smaller data size PIO mode will be used. In PIO mode whole buffer will
> be loaded into FIFO.
>
> If driver failed to request DMA channels then it fallback for PIO mode.
>
> Tested on SOPINE (https://www.pine64.org/sopine/)
>
> Signed-off-by: Alexander Kochetkov <al.kochet@gmail.com>
Acked-by: Maxime Ripard <mripard@kernel.org>
Thanks!
Maxime
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next prev parent reply other threads:[~2020-10-22 15:43 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-10-22 7:52 [PATCH v3] spi: spi-sun6i: implement DMA-based transfer mode Alexander Kochetkov
2020-10-22 15:43 ` Maxime Ripard [this message]
2020-10-26 23:47 ` Mark Brown
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