Messages in this thread | | | Subject | Re: [PATCH] spi: spi-geni-qcom: Don't wait to start 1st transfer if transmitting | From | Akash Asthana <> | Date | Mon, 14 Sep 2020 18:39:25 +0530 |
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On 9/12/2020 11:47 PM, Douglas Anderson wrote: > If we're sending bytes over SPI, we know the FIFO is empty at the > start of the transfer. There's no reason to wait for the interrupt > telling us to start--we can just start right away. Then if we > transmit everything in one swell foop we don't even need to bother > listening for TX interrupts. > > In a test of "flashrom -p ec -r /tmp/foo.bin" interrupts were reduced > from ~30560 to ~29730, about a 3% savings. > > This patch looks bigger than it is because I moved a few functions > rather than adding a forward declaration. The only actual change to > geni_spi_handle_tx() was to make it return a bool indicating if there > is more to tx. Reviewed-by: Akash Asthana <akashast@codeaurora.org> > Signed-off-by: Douglas Anderson<dianders@chromium.org>
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