linux-kernel - Re: [PATCH v1 1/4] dmaengine: imx-sdma: add memcpy interface

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Message-ID: <20180711071206.GM3219@vkoul-mobl>
Date:   Wed, 11 Jul 2018 12:42:06 +0530
From:   Vinod <vkoul@...nel.org>
To:     Robin Gong <yibin.gong@....com>
Cc:     "dan.j.williams@...el.com" <dan.j.williams@...el.com>,
        "shawnguo@...nel.org" <shawnguo@...nel.org>,
        "s.hauer@...gutronix.de" <s.hauer@...gutronix.de>,
        Fabio Estevam <fabio.estevam@....com>,
        "linux@...linux.org.uk" <linux@...linux.org.uk>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "kernel@...gutronix.de" <kernel@...gutronix.de>,
        "dmaengine@...r.kernel.org" <dmaengine@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        dl-linux-imx <linux-imx@....com>
Subject: Re: [PATCH v1 1/4] dmaengine: imx-sdma: add memcpy interface

On 11-07-18, 05:34, Robin Gong wrote:
> > On 11-07-18, 00:23, Robin Gong wrote:
> > > Add MEMCPY support, meanwhile, add SDMA_BD_MAX_CNT instead of
> > > '0xffff'.
> > 
> > latter part should be its own patch. Never mix things
> Okay, I will split it even for this minor change.

Yes, a patch should represent _one_ thing, describe that one thing and
do that one thing.

Anything else, doesn't matter how simple or complex should be an
individual patch

> > > +	if (!desc)
> > > +		goto err_out;
> > > +
> > > +	do {
> > > +		count = min_t(size_t, len, SDMA_BD_MAX_CNT);
> > > +		bd = &desc->bd[i];
> > > +		bd->buffer_addr = dma_src;
> > > +		bd->ext_buffer_addr = dma_dst;
> > > +		bd->mode.count = count;
> > > +		desc->chn_count += count;
> > > +
> > > +		switch (sdmac->word_size) {
> > > +		case DMA_SLAVE_BUSWIDTH_4_BYTES:
> > 
> > This looks wrong, we are in memcpy, there is no SLAVE so no SLAVE widths..
> > 
> Okay, will remove check bus width.

it is not about bus_width but the fact that you are using slave
concepts. In memcpy we have _no_ slave, hence do not use anything
related to slave including dma_slave_config

-- 
~Vinod