[PATCH] dmaengine: sun6i: Choose appropriate burst length under maxburst

[Jernej Škrabec]

Dne nedelja, 21. december 2025 ob 09:04:48 Srednjeevropski standardni čas je Chen-Yu Tsai napisal(a):
> maxburst, as provided by the client, specifies the largest amount of
> data that is allowed to be transferred in one burst. This limit is
> normally provided to avoid a data burst overflowing the target FIFO.
> It does not mean that the DMA engine can only do bursts in that size.
> 
> Let the driver pick the largest supported burst length within the
> given limit. This lets the driver work correctly with some clients that
> give a large maxburst value. In particular, the 8250_dw driver will give
> a quarter of the UART's FIFO size as maxburst. On some systems the FIFO
> size is 256 bytes, giving a maxburst of 64 bytes, while the hardware
> only supports bursts of up to 16 bytes.
> 
> Signed-off-by: Chen-Yu Tsai <wens at kernel.org>

Reviewed-by: Jernej Skrabec <jernej.skrabec at gmail.com>

Best regards,
Jernej