linux-kernel - Re: [PATCH] spi: spi-geni-qcom: Don't set the cs if it was already right

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Message-ID: <20200629115316.GB5499@sirena.org.uk>
Date:   Mon, 29 Jun 2020 12:53:17 +0100
From:   Mark Brown <broonie@...nel.org>
To:     Douglas Anderson <dianders@...omium.org>
Cc:     linux-arm-msm@...r.kernel.org, swboyd@...omium.org,
        Dilip Kota <dkota@...eaurora.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Andy Gross <agross@...nel.org>, linux-kernel@...r.kernel.org,
        linux-spi@...r.kernel.org
Subject: Re: [PATCH] spi: spi-geni-qcom: Don't set the cs if it was already
 right

On Fri, Jun 26, 2020 at 03:19:50PM -0700, Douglas Anderson wrote:
> Setting the chip select on the Qualcomm geni SPI controller isn't
> exactly cheap.  Let's cache the current setting and avoid setting the
> chip select if it's already right.

Seems like it'd be worth pushing this up to the core - if we're
constantly setting the same CS value then perhaps we ought to just stop
doing that?

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