Re: [PATCH v2 2/5] spi: spi-ti-qspi: add mmap mode read support

[Mark Brown]

On Tue, Nov 03, 2015 at 03:36:11PM +0530, Vignesh R wrote:

> +	ti_qspi_enable_memory_map(spi);
> +	ti_qspi_setup_mmap_read(spi, read_opcode, addr_width,
> +				dummy_bytes);
> +	memcpy_fromio(buf, qspi->mmap_base + from, len);
> +	*retlen = len;
> +	ti_qspi_disable_memory_map(spi);

We'll be constantly enabling and disabling memory mapping with this.
I'm not sure that's a meaningful cost given that it doesn't actually
remap anything but rather just switches hardware modes, we can always
optimise it later if it is.

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