spi: spi-geni-qcom: Don't set the cs if it was already right
Setting the chip select on the Qualcomm geni SPI controller isn't exactly cheap. Let's cache the current setting and avoid setting the chip select if it's already right. Using "flashrom" to read or write the EC firmware on a Chromebook shows roughly a 25% reduction in interrupts and a 15% speedup. Signed-off-by: Douglas Anderson <dianders@chromium.org> Link: https://lore.kernel.org/r/20200626151946.1.I06134fd669bf91fd387dc6ecfe21d44c202bd412@changeid Signed-off-by: Mark Brown <broonie@kernel.org>
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