linux-kernel - Re: [PATCH v7 08/11] dmaengine: dw: Add dummy device

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Date:   Fri, 10 Jul 2020 11:51:23 +0300
From:   Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:     Serge Semin <Sergey.Semin@...kalelectronics.ru>
Cc:     Vinod Koul <vkoul@...nel.org>, Viresh Kumar <vireshk@...nel.org>,
        Dan Williams <dan.j.williams@...el.com>,
        Serge Semin <fancer.lancer@...il.com>,
        Alexey Malahov <Alexey.Malahov@...kalelectronics.ru>,
        Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
        Arnd Bergmann <arnd@...db.de>,
        Rob Herring <robh+dt@...nel.org>, linux-mips@...r.kernel.org,
        devicetree@...r.kernel.org, dmaengine@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v7 08/11] dmaengine: dw: Add dummy device_caps callback

On Fri, Jul 10, 2020 at 01:45:47AM +0300, Serge Semin wrote:
> Since some DW DMA controllers (like one installed on Baikal-T1 SoC) may
> have non-uniform DMA capabilities per device channels, let's add
> the DW DMA specific device_caps callback to expose that specifics up to
> the DMA consumer. It's a dummy function for now. We'll fill it in with
> capabilities overrides in the next commits.

Just a reminder (mainly to Vinod) of my view to this.
Unneeded churn, should be folded to patch 9.

> Signed-off-by: Serge Semin <Sergey.Semin@...kalelectronics.ru>
> Cc: Alexey Malahov <Alexey.Malahov@...kalelectronics.ru>
> Cc: Thomas Bogendoerfer <tsbogend@...ha.franken.de>
> Cc: Arnd Bergmann <arnd@...db.de>
> Cc: Rob Herring <robh+dt@...nel.org>
> Cc: linux-mips@...r.kernel.org
> Cc: devicetree@...r.kernel.org
> 
> ---
> 
> Changelog v3:
> - This is a new patch created as a result of the discussion with Vinud and
>   Andy in the framework of DW DMA burst and LLP capabilities.
> ---
>  drivers/dma/dw/core.c | 6 ++++++
>  1 file changed, 6 insertions(+)
> 
> diff --git a/drivers/dma/dw/core.c b/drivers/dma/dw/core.c
> index fb95920c429e..ceded21537e2 100644
> --- a/drivers/dma/dw/core.c
> +++ b/drivers/dma/dw/core.c
> @@ -1049,6 +1049,11 @@ static void dwc_free_chan_resources(struct dma_chan *chan)
>  	dev_vdbg(chan2dev(chan), "%s: done\n", __func__);
>  }
>  
> +static void dwc_caps(struct dma_chan *chan, struct dma_slave_caps *caps)
> +{
> +
> +}
> +
>  int do_dma_probe(struct dw_dma_chip *chip)
>  {
>  	struct dw_dma *dw = chip->dw;
> @@ -1214,6 +1219,7 @@ int do_dma_probe(struct dw_dma_chip *chip)
>  	dw->dma.device_prep_dma_memcpy = dwc_prep_dma_memcpy;
>  	dw->dma.device_prep_slave_sg = dwc_prep_slave_sg;
>  
> +	dw->dma.device_caps = dwc_caps;
>  	dw->dma.device_config = dwc_config;
>  	dw->dma.device_pause = dwc_pause;
>  	dw->dma.device_resume = dwc_resume;
> -- 
> 2.26.2
> 

-- 
With Best Regards,
Andy Shevchenko