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

[Maxime Ripard]

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

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

Thanks!
Maxime
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