linux-kernel - Re: [PATCH 7/7] arm64: dts: qcom: sdm845: enable dma for spi

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Date:   Mon, 11 Jan 2021 21:45:03 +0100
From:   Konrad Dybcio <konrad.dybcio@...ainline.org>
To:     Vinod Koul <vkoul@...nel.org>
Cc:     Bjorn Andersson <bjorn.andersson@...aro.org>,
        Mark Brown <broonie@...nel.org>, Wolfram Sang <wsa@...nel.org>,
        linux-arm-msm@...r.kernel.org, Andy Gross <agross@...nel.org>,
        Matthias Kaehlcke <mka@...omium.org>,
        Douglas Anderson <dianders@...omium.org>,
        Sumit Semwal <sumit.semwal@...aro.org>,
        Amit Pundir <amit.pundir@...aro.org>,
        linux-spi@...r.kernel.org, linux-i2c@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 7/7] arm64: dts: qcom: sdm845: enable dma for spi


> If it is working without GPI enabled, it would work.. GPI for QUP is
> something that requires firmware and would have to be enabled by
> firmware


I think with the new code of yours:


mas->tx = dma_request_slave_channel(mas->dev, "tx");
+ if (IS_ERR_OR_NULL(mas->tx)) {
+ dev_err(mas->dev, "Failed to get tx DMA ch %ld", PTR_ERR(mas->tx)); ret = PTR_ERR(mas->tx); + goto out_pm;


it *may* fail to probe with the channels assigned in the "dmas=" property but with the engine having "status=disabled", but as I don't have any hardware to test that driver on, please confirm whether my concerns are right..


> Since DMA support may not be available on certain targets (firmware
> support), so enabling per board would make sense

Oh really, are there SDM845 boards shipping with GPI DMA *disabled to all peripherals*?


Konrad