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SubjectRE: [PATCH v1 2/4] dmaengine: imx-sdma: add check_bd_buswidth() to kill the dulicated code
Date
> -----Original Message-----
> From: Vinod [mailto:vkoul@kernel.org]
> Sent: 2018年7月10日 23:31
> To: Robin Gong <yibin.gong@nxp.com>
> Cc: dan.j.williams@intel.com; shawnguo@kernel.org;
> s.hauer@pengutronix.de; Fabio Estevam <fabio.estevam@nxp.com>;
> linux@armlinux.org.uk; linux-arm-kernel@lists.infradead.org;
> kernel@pengutronix.de; dmaengine@vger.kernel.org;
> linux-kernel@vger.kernel.org; dl-linux-imx <linux-imx@nxp.com>
> Subject: Re: [PATCH v1 2/4] dmaengine: imx-sdma: add check_bd_buswidth() to
> kill the dulicated code
>
> On 11-07-18, 00:23, Robin Gong wrote:
> > Add check_bd_buswidth() to minimize the code size.
>
> this looks mostly fine and I think this should be first patch..
Since no need to check bus width in memcpy case, I'll remove this patch too.
>
> >
> > Signed-off-by: Robin Gong <yibin.gong@nxp.com>
> > ---
> > drivers/dma/imx-sdma.c | 64
> > +++++++++++++++++++++++---------------------------
> > 1 file changed, 29 insertions(+), 35 deletions(-)
> >
> > diff --git a/drivers/dma/imx-sdma.c b/drivers/dma/imx-sdma.c index
> > 27ccabf..ed2267d 100644
> > --- a/drivers/dma/imx-sdma.c
> > +++ b/drivers/dma/imx-sdma.c
> > @@ -1326,6 +1326,33 @@ static struct sdma_desc
> *sdma_transfer_init(struct sdma_channel *sdmac,
> > return NULL;
> > }
> >
> > +static int check_bd_buswidth(struct sdma_buffer_descriptor *bd,
> > + struct sdma_channel *sdmac, int count,
> > + dma_addr_t dma_dst, dma_addr_t dma_src) {
> > + int ret = 0;
> > +
> > + switch (sdmac->word_size) {
> > + case DMA_SLAVE_BUSWIDTH_4_BYTES:
> > + bd->mode.command = 0;
> > + if ((count | dma_dst | dma_src) & 3)
> > + ret = -EINVAL;
> > + break;
>
> empty line after each break please
>
> > + case DMA_SLAVE_BUSWIDTH_2_BYTES:
> > + bd->mode.command = 2;
> > + if ((count | dma_dst | dma_src) & 1)
> > + ret = -EINVAL;
> > + break;
> > + case DMA_SLAVE_BUSWIDTH_1_BYTE:
> > + bd->mode.command = 1;
> > + break;
> > + default:
> > + return -EINVAL;
> > + }
> > +
> > + return ret;
> > +}
> > +
> --
> ~Vinod
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