On Mon, 29 Jun 2020 16:41:06 -0700, Douglas Anderson wrote:
> On some SPI controllers (like spi-geni-qcom) setting the chip select
> is a heavy operation.  For instance on spi-geni-qcom, with the current
> code, is was measured as taking upwards of 20 us.  Even on SPI
> controllers that aren't as heavy, setting the chip select is at least
> something like a MMIO operation over some peripheral bus which isn't
> as fast as a RAM access.
> [...]

Applied to

   https://git.kernel.org/pub/scm/linux/kernel/git/broonie/spi.git for-next


[1/1] spi: Avoid setting the chip select if we don't need to
      commit: d40f0b6f2e21f2400ae8b1b120d11877d9ffd8ec

All being well this means that it will be integrated into the linux-next
tree (usually sometime in the next 24 hours) and sent to Linus during
the next merge window (or sooner if it is a bug fix), however if
problems are discovered then the patch may be dropped or reverted.

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