linux-kernel - Re: [PATCH RESEND] tty: serial: qcom-geni-serial: Poll primary sequencer irq status after cancel

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Message-ID: <e3b3b347-88b5-ab58-b7d4-3963e2c3b726@linaro.org>
Date:   Wed, 9 Aug 2023 20:40:00 +0100
From:   Bryan O'Donoghue <bryan.odonoghue@...aro.org>
To:     Vijaya Krishna Nivarthi <quic_vnivarth@...cinc.com>,
        agross@...nel.org, bjorn.andersson@...nel.org,
        konrad.dybcio@...aro.org, gregkh@...uxfoundation.org,
        jirislaby@...nel.org, bartosz.golaszewski@...aro.org,
        linux-arm-msm@...r.kernel.org, linux-serial@...r.kernel.org,
        linux-kernel@...r.kernel.org
Cc:     quic_msavaliy@...cinc.com, dianders@...omium.org, mka@...omium.org,
        swboyd@...omium.org, quic_vtanuku@...cinc.com
Subject: Re: [PATCH RESEND] tty: serial: qcom-geni-serial: Poll primary
 sequencer irq status after cancel_tx

On 09/08/2023 13:11, Vijaya Krishna Nivarthi wrote:
> While at it, also remove a couple of redundant lines that read from IRQ_EN
> register and write back same.
> 
> Fixes: 2aaa43c70778 ("tty: serial: qcom-geni-serial: add support for serial engine DMA")
> Signed-off-by: Vijaya Krishna Nivarthi<quic_vnivarth@...cinc.com>

The "while at it" should be put into a separate patch.

I wonder if the read/write cycle is there to ensure an io-completion ?

Either way please break this up into two individual patches. One thing 
changing where you poll and the other removing the read/write cycle, so 
the changes may be evaluated individually.

---
bod