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

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Message-Id: <20200709145145.4055619-1-dianders@chromium.org>
Date:   Thu,  9 Jul 2020 07:51:43 -0700
From:   Douglas Anderson <dianders@...omium.org>
To:     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>,
        akashast@...eaurora.org, georgi.djakov@...aro.org,
        Douglas Anderson <dianders@...omium.org>,
        linux-kernel@...r.kernel.org, linux-spi@...r.kernel.org
Subject: [PATCH v2 0/2] spi: spi-qcom-qspi: Avoid some per-transfer overhead


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(-)

-- 
2.27.0.383.g050319c2ae-goog