From: Long Cheng <long.cheng@mediatek.com>
To: Vinod Koul <vkoul@kernel.org>
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>,
Long Cheng <long.cheng@mediatek.com>
Subject: Re: [PATCH v10 1/3] dmaengine: 8250_mtk_dma: add MediaTek uart DMA support
Date: Thu, 14 Feb 2019 10:44:56 +0800 [thread overview]
Message-ID: <1550112296.7678.5.camel@mhfsdcap03> (raw)
In-Reply-To: <20190204072154.GJ4296@vkoul-mobl>
On Mon, 2019-02-04 at 12:51 +0530, Vinod Koul wrote:
Hi Vinod sir,
> On 18-01-19, 11:10, Long Cheng wrote:
> > +static enum dma_status mtk_uart_apdma_tx_status(struct dma_chan *chan,
> > + dma_cookie_t cookie,
> > + struct dma_tx_state *txstate)
> > +{
> > + struct mtk_chan *c = to_mtk_uart_apdma_chan(chan);
> > + enum dma_status ret;
> > + unsigned long flags;
> > +
> > + if (!txstate)
> > + return DMA_ERROR;
>
> Why, it is not a mandatory arg!
Next version, I will remove it.
>
> > + ret = dma_cookie_status(chan, cookie, txstate);
> > + spin_lock_irqsave(&c->vc.lock, flags);
> > + if (ret == DMA_IN_PROGRESS) {
> > + c->rx_status = mtk_uart_apdma_read(c, VFF_RPT) & VFF_RING_SIZE;
> > + dma_set_residue(txstate, c->rx_status);
> > + } else if (ret == DMA_COMPLETE && c->dir == DMA_DEV_TO_MEM) {
> > + dma_set_residue(txstate, c->rx_status);
>
> what is the point is setting residue to comleted txn, it is zero!
>
> > + } else {
> > + dma_set_residue(txstate, 0);
>
> naah that doesnt sound correct!
>
Next version, I will modify the function.
> > +static void mtk_uart_apdma_config_write(struct dma_chan *chan,
> > + struct dma_slave_config *cfg,
> > + enum dma_transfer_direction dir)
> > +{
> > + struct mtk_chan *c = to_mtk_uart_apdma_chan(chan);
> > + struct mtk_uart_apdmadev *mtkd =
> > + to_mtk_uart_apdma_dev(c->vc.chan.device);
> > + unsigned int tmp;
> > +
> > + if (mtk_uart_apdma_read(c, VFF_EN) == VFF_EN_B)
> > + return;
> > +
> > + c->dir = dir;
> > +
> > + if (dir == DMA_DEV_TO_MEM) {
> > + tmp = cfg->src_addr_width * 1024;
>
> why multiply by 1024?
>
Next version, I will modify the this, with 'src_port_window_size' &&
'dst_port_window_size'.
> > +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..
thanks.
next prev parent reply other threads:[~2019-02-14 2:45 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-01-18 3:10 [PATCH v10 0/3] add uart DMA function Long Cheng
2019-01-18 3:10 ` [PATCH v10 1/3] dmaengine: 8250_mtk_dma: add MediaTek uart DMA support Long Cheng
2019-01-28 3:25 ` Long Cheng
2019-02-04 7:21 ` Vinod Koul
2019-02-14 2:44 ` Long Cheng [this message]
2019-02-19 12:14 ` Vinod Koul
2019-02-14 10:08 ` Matthias Brugger
2019-01-18 3:10 ` [PATCH v10 2/3] arm: dts: mt2712: add uart APDMA to device tree Long Cheng
2019-01-18 3:10 ` [PATCH v10 3/3] dt-bindings: dma: uart: rename binding Long Cheng
2019-01-21 14:18 ` Rob Herring
2019-02-14 10:13 ` Matthias Brugger
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