linux-kernel - Re: [PATCH 3/3] spi: spi-geni-qcom: Get rid of most overhead in prepare

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Message-ID: <20200708124903.GN4655@sirena.org.uk>
Date:   Wed, 8 Jul 2020 13:49:03 +0100
From:   Mark Brown <broonie@...nel.org>
To:     Douglas Anderson <dianders@...omium.org>
Cc:     Andy Gross <agross@...nel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        akashast@...eaurora.org, linux-arm-msm@...r.kernel.org,
        mkshah@...eaurora.org, swboyd@...omium.org,
        georgi.djakov@...aro.org, ctheegal@...eaurora.org,
        mka@...omium.org, linux-kernel@...r.kernel.org,
        linux-spi@...r.kernel.org
Subject: Re: [PATCH 3/3] spi: spi-geni-qcom: Get rid of most overhead in
 prepare_message()

On Wed, Jul 01, 2020 at 05:45:09PM -0700, Douglas Anderson wrote:
> There's a bunch of overhead in spi-geni-qcom's prepare_message.  Get
> rid of it.  Before this change spi_geni_prepare_message() took around
> 14.5 us.  After this change, spi_geni_prepare_message() takes about
> 1.75 us (as measured by ftrace).

Acked-by: Mark Brown <broonie@...nel.org>

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