linux-kernel - Re: [PATCH v2 05/18] dmaengine: owl: Add compatible for the Actions Semi S500 DMA controller

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Date:   Sun, 29 Nov 2020 20:24:21 +0200
From:   Cristian Ciocaltea <cristian.ciocaltea@...il.com>
To:     Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
Cc:     Vinod Koul <vkoul@...nel.org>,
        Dan Williams <dan.j.williams@...el.com>,
        Andreas Färber <afaerber@...e.de>,
        Rob Herring <robh+dt@...nel.org>, dmaengine@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-actions@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 05/18] dmaengine: owl: Add compatible for the Actions
 Semi S500 DMA controller

On Sat, Nov 28, 2020 at 01:00:45PM +0530, Manivannan Sadhasivam wrote:
> On Fri, Nov 20, 2020 at 01:55:59AM +0200, Cristian Ciocaltea wrote:
> > The DMA controller present on the Actions Semi S500 SoC is compatible
> > with the S900 variant, so add it to the list of devices supported by
> > the Actions Semi Owl DMA driver.
> > 
> > Signed-off-by: Cristian Ciocaltea <cristian.ciocaltea@...il.com>
> 
> I hope that you have verified both Memcpy and Slave transfers...

I have been using 'dmatest' module as documented in:
https://www.kernel.org/doc/html/latest/driver-api/dmaengine/dmatest.html

I tested all the available channels and could not find any signs of
possible issues. Bellow is an excerpt from the kernel ring buffer:

[ 2661.884680] dmatest: dma0chan1-copy0: summary 300 tests, 0 failures 1653.48 iops 13249 KB/s (0)
[ 2661.886567] dmatest: dma0chan2-copy0: summary 300 tests, 0 failures 1684.40 iops 12846 KB/s (0)
[ 2661.888448] dmatest: dma0chan3-copy0: summary 300 tests, 0 failures 1730.62 iops 13648 KB/s (0)

Should I perform some additional tests?

Thanks,
Cristi

> Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
> 
> Thanks,
> Mani
> 
> > ---
> >  drivers/dma/owl-dma.c | 1 +
> >  1 file changed, 1 insertion(+)
> > 
> > diff --git a/drivers/dma/owl-dma.c b/drivers/dma/owl-dma.c
> > index 9fede32641e9..54e509de66e2 100644
> > --- a/drivers/dma/owl-dma.c
> > +++ b/drivers/dma/owl-dma.c
> > @@ -1082,6 +1082,7 @@ static struct dma_chan *owl_dma_of_xlate(struct of_phandle_args *dma_spec,
> >  static const struct of_device_id owl_dma_match[] = {
> >  	{ .compatible = "actions,s900-dma", .data = (void *)S900_DMA,},
> >  	{ .compatible = "actions,s700-dma", .data = (void *)S700_DMA,},
> > +	{ .compatible = "actions,s500-dma", .data = (void *)S900_DMA,},
> >  	{ /* sentinel */ },
> >  };
> >  MODULE_DEVICE_TABLE(of, owl_dma_match);
> > -- 
> > 2.29.2
> >