linux-kernel - Re: [PATCH v3] spi: spi-sun6i: implement DMA-based transfer mode

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Date:   Thu, 22 Oct 2020 17:43:34 +0200
From:   Maxime Ripard <maxime@...no.tech>
To:     Alexander Kochetkov <al.kochet@...il.com>
Cc:     Mark Brown <broonie@...nel.org>, Chen-Yu Tsai <wens@...e.org>,
        linux-spi@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3] spi: spi-sun6i: implement DMA-based transfer mode

On Thu, Oct 22, 2020 at 10:52:21AM +0300, Alexander Kochetkov wrote:
> From: Alexander Kochetkov <al.kochet@...il.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@...il.com>

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

Thanks!
Maxime

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