linux-kernel - Re: [PATCH 3/4] spi: spi-qcom-qspi: Call dma

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Message-ID: <CAD=FV=VZFXiT6R=RBy=Mj4TEewHPYpz9cG6wE_SeE8=KrBVVVg@mail.gmail.com>
Date:   Tue, 25 Jul 2023 10:58:12 -0700
From:   Doug Anderson <dianders@...omium.org>
To:     Vijaya Krishna Nivarthi <quic_vnivarth@...cinc.com>
Cc:     agross@...nel.org, andersson@...nel.org, konrad.dybcio@...aro.org,
        broonie@...nel.org, linux-arm-msm@...r.kernel.org,
        linux-spi@...r.kernel.org, linux-kernel@...r.kernel.org,
        quic_msavaliy@...cinc.com, mka@...omium.org, swboyd@...omium.org,
        quic_vtanuku@...cinc.com, dan.carpenter@...aro.org
Subject: Re: [PATCH 3/4] spi: spi-qcom-qspi: Call dma_wmb() after setting up descriptors

Hi,

On Tue, Jul 25, 2023 at 4:48 AM Vijaya Krishna Nivarthi
<quic_vnivarth@...cinc.com> wrote:
>
> After setting up dma descriptors and before initiaiting dma transfer, call
> dma_wmb() to ensure all writes go through.
> This doesn't fix any reported problem but is added for safety.
>
> Signed-off-by: Vijaya Krishna Nivarthi <quic_vnivarth@...cinc.com>
> ---
>  drivers/spi/spi-qcom-qspi.c | 4 +++-
>  1 file changed, 3 insertions(+), 1 deletion(-)

This looks right to me.

Fixes: b5762d95607e ("spi: spi-qcom-qspi: Add DMA mode support")
Reviewed-by: Douglas Anderson <dianders@...omium.org>