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Date:   Tue, 19 Feb 2019 17:44:20 +0530
From:   Vinod Koul <vkoul@kernel.org>
To:     Long Cheng <long.cheng@mediatek.com>
Cc:     Randy Dunlap <rdunlap@infradead.org>,
        Rob Herring <robh+dt@kernel.org>,
        Mark Rutland <mark.rutland@arm.com>,
        Ryder Lee <ryder.lee@mediatek.com>,
        Sean Wang <sean.wang@kernel.org>,
        Nicolas Boichat <drinkcat@chromium.org>,
        Matthias Brugger <matthias.bgg@gmail.com>,
        Dan Williams <dan.j.williams@intel.com>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        Jiri Slaby <jslaby@suse.com>,
        Sean Wang <sean.wang@mediatek.com>, dmaengine@vger.kernel.org,
        devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
        linux-mediatek@lists.infradead.org, linux-kernel@vger.kernel.org,
        linux-serial@vger.kernel.org, srv_heupstream@mediatek.com,
        Yingjoe Chen <yingjoe.chen@mediatek.com>,
        YT Shen <yt.shen@mediatek.com>,
        Zhenbao Liu <zhenbao.liu@mediatek.com>
Subject: Re: [PATCH v10 1/3] dmaengine: 8250_mtk_dma: add MediaTek uart DMA
 support
Message-ID: <20190219121420.GZ21884@vkoul-mobl>
References: <1547781016-890-1-git-send-email-long.cheng@mediatek.com>
 <1547781016-890-2-git-send-email-long.cheng@mediatek.com>
 <20190204072154.GJ4296@vkoul-mobl>
 <1550112296.7678.5.camel@mhfsdcap03>
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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