[PATCH] spi: atmel: Prevent false timeouts on long transfers

[Mark Brown]

On Fri, Jun 16, 2023 at 04:12:25PM +0200, Miquel Raynal wrote:

> -#define SPI_DMA_TIMEOUT		(msecs_to_jiffies(1000))
> +#define SPI_DMA_MIN_TIMEOUT	(msecs_to_jiffies(1000))
> +#define SPI_DMA_TIMEOUT_PER_10K	(msecs_to_jiffies(4))

Given that we know the bus speed can't we just calculate this like other
drivers do (we should probably add a helper TBH)?
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