linux-kernel - Re: [PATCH v10 1/3] dmaengine: 8250_mtk

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Message-ID: <20190219121420.GZ21884@vkoul-mobl>
Date:   Tue, 19 Feb 2019 17:44:20 +0530
From:   Vinod Koul <vkoul@...nel.org>
To:     Long Cheng <long.cheng@...iatek.com>
Cc:     Randy Dunlap <rdunlap@...radead.org>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Ryder Lee <ryder.lee@...iatek.com>,
        Sean Wang <sean.wang@...nel.org>,
        Nicolas Boichat <drinkcat@...omium.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Dan Williams <dan.j.williams@...el.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jiri Slaby <jslaby@...e.com>,
        Sean Wang <sean.wang@...iatek.com>, dmaengine@...r.kernel.org,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-serial@...r.kernel.org, srv_heupstream@...iatek.com,
        Yingjoe Chen <yingjoe.chen@...iatek.com>,
        YT Shen <yt.shen@...iatek.com>,
        Zhenbao Liu <zhenbao.liu@...iatek.com>
Subject: Re: [PATCH v10 1/3] dmaengine: 8250_mtk_dma: add MediaTek uart DMA
 support

On 14-02-19, 10:44, Long Cheng wrote:
> On Mon, 2019-02-04 at 12:51 +0530, Vinod Koul wrote:

> > > +static int mtk_uart_apdma_device_pause(struct dma_chan *chan)
> > > +{
> > > +	/* just for check caps pass */
> > > +	return 0;
> > > +}
> > 
> > please remove, this is not a mandatory fn
> 
> Can't remove it. Before the mail, i had explained it. in 8250 uart
> framework, will check the function..

I think you should fix the 8250 uart to handle driver not having a
pause. Keeping a dummy pause is just wrong and sets wrong expectations
for uart..

-- 
~Vinod