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

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Message-ID: <9fcbed05-de8f-9794-6cd5-2623fd79dbb5@codeaurora.org>
Date:   Fri, 10 Jul 2020 10:15:22 +0530
From:   Akash Asthana <akashast@...eaurora.org>
To:     Douglas Anderson <dianders@...omium.org>,
        Mark Brown <broonie@...nel.org>,
        Andy Gross <agross@...nel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>
Cc:     swboyd@...omium.org, linux-arm-msm@...r.kernel.org,
        ctheegal@...eaurora.org, mkshah@...eaurora.org, mka@...omium.org,
        Rajendra Nayak <rnayak@...eaurora.org>,
        georgi.djakov@...aro.org, linux-kernel@...r.kernel.org,
        linux-spi@...r.kernel.org
Subject: Re: [PATCH v2 0/2] spi: spi-qcom-qspi: Avoid some per-transfer
 overhead


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@...eaurora.org>

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