linux-kernel - Re: [PATCH V6 2/2] mailbox: introduce ARM SMC based mailbox

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Date:   Wed, 18 Sep 2019 09:22:54 -0500
From:   Jassi Brar <jassisinghbrar@...il.com>
To:     Andre Przywara <andre.przywara@....com>
Cc:     Peng Fan <peng.fan@....com>,
        "robh+dt@...nel.org" <robh+dt@...nel.org>,
        "mark.rutland@....com" <mark.rutland@....com>,
        "sudeep.holla@....com" <sudeep.holla@....com>,
        "f.fainelli@...il.com" <f.fainelli@...il.com>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        dl-linux-imx <linux-imx@....com>
Subject: Re: [PATCH V6 2/2] mailbox: introduce ARM SMC based mailbox

On Wed, Sep 18, 2019 at 8:58 AM Andre Przywara <andre.przywara@....com> wrote:
>

> > > Also there is mbox_chan_txdone() with which a controller driver can signal TX completion explicitly.
> > >
> > No. Controller can use that only if it has specified txdone_irq, which
> > is not the case here.
>
> I see. So does the framework handle the case where both txdone_poll and txdone_irq are false?
>
Of course. If there is no IRQ or POLL mechanism for controller to
detect tx-done, the only way left is for client driver to know by some
'ack' response (if any). The client should call mbox_client_txdone()

Thanks