linux-kernel - Re: [PATCH 2/2] spi: spi-qcom-qspi: Add mem_ops to avoid PIO for badly sized reads

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Date:   Tue, 25 Jul 2023 19:48:45 +0100
From:   Mark Brown <broonie@...nel.org>
To:     Doug Anderson <dianders@...omium.org>
Cc:     Vijaya Krishna Nivarthi <quic_vnivarth@...cinc.com>,
        Andy Gross <agross@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konrad.dybcio@...aro.org>,
        linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-spi@...r.kernel.org
Subject: Re: [PATCH 2/2] spi: spi-qcom-qspi: Add mem_ops to avoid PIO for
 badly sized reads

On Tue, Jul 25, 2023 at 11:30:30AM -0700, Doug Anderson wrote:

> Note that it's pretty likely someone wouldn't use this SPI controller
> for anything other than SPI flash. While it's theoretically possible,
> the controller is intended for SPI flash (supports dual and quad SPI
> modes) and is only half duplex.

TBH most devices are half duplex so it's not *that* big a restriction,
and dual/quad mode are obviously attractive if you need to transfer
large quantities of data.

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