Re: [PATCH v2 0/2] spi: spi-qcom-qspi: Avoid some per-transfer overhead

[Akash Asthana <akashast@codeaurora.org>]

On 7/9/2020 8:21 PM, Douglas Anderson wrote:
> Not to be confused with the similar series I posed for the _other_
> Qualcomm SPI controller (spi-geni-qcom) [1], this one avoids the
> overhead on the Quad SPI controller.
>
> It's based atop the current Qualcomm tree including Rajendra's ("spi:
> spi-qcom-qspi: Use OPP API to set clk/perf state").  As discussed in
> individual patches, these could ideally land through the Qualcomm tree
> with Mark's Ack.
>
> Measuring:
> * Before OPP / Interconnect patches reading all flash takes: ~3.4 seconds
> * After OPP / Interconnect patches reading all flash takes: ~4.7 seconds
> * After this patch reading all flash takes: ~3.3 seconds
>
> [1] https://lore.kernel.org/r/20200702004509.2333554-1-dianders@chromium.org
> [2] https://lore.kernel.org/r/1593769293-6354-2-git-send-email-rnayak@codeaurora.org
>
> Changes in v2:
> - Return error from runtime resume if dev_pm_opp_set_rate() fails.
>
> Douglas Anderson (2):
>    spi: spi-qcom-qspi: Avoid clock setting if not needed
>    spi: spi-qcom-qspi: Set an autosuspend delay of 250 ms
>
>   drivers/spi/spi-qcom-qspi.c | 43 ++++++++++++++++++++++++++++---------
>   1 file changed, 33 insertions(+), 10 deletions(-)
Reviewed-by: Akash Asthana <akashast@codeaurora.org>

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