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From: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
To: Serge Semin <Sergey.Semin@baikalelectronics.ru>
Cc: Vinod Koul <vkoul@kernel.org>, Viresh Kumar <vireshk@kernel.org>,
	Dan Williams <dan.j.williams@intel.com>,
	Serge Semin <fancer.lancer@gmail.com>,
	Alexey Malahov <Alexey.Malahov@baikalelectronics.ru>,
	Thomas Bogendoerfer <tsbogend@alpha.franken.de>,
	Arnd Bergmann <arnd@arndb.de>, Rob Herring <robh+dt@kernel.org>,
	linux-mips@vger.kernel.org, devicetree@vger.kernel.org,
	dmaengine@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH v7 08/11] dmaengine: dw: Add dummy device_caps callback
Date: Fri, 10 Jul 2020 11:51:23 +0300
Message-ID: <20200710085123.GF3703480@smile.fi.intel.com> (raw)
In-Reply-To: <20200709224550.15539-9-Sergey.Semin@baikalelectronics.ru>

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@baikalelectronics.ru>
> Cc: Alexey Malahov <Alexey.Malahov@baikalelectronics.ru>
> Cc: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
> Cc: Arnd Bergmann <arnd@arndb.de>
> Cc: Rob Herring <robh+dt@kernel.org>
> Cc: linux-mips@vger.kernel.org
> Cc: devicetree@vger.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



  reply index

Thread overview: 33+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-07-09 22:45 [PATCH RESEND v7 00/11] dmaengine: dw: Take Baikal-T1 SoC DW DMAC peculiarities into account Serge Semin
2020-07-09 22:45 ` [PATCH v7 01/11] dt-bindings: dma: dw: Convert DW DMAC to DT binding Serge Semin
2020-07-09 22:45 ` [PATCH v7 02/11] dt-bindings: dma: dw: Add max burst transaction length property Serge Semin
2020-07-09 22:45 ` [PATCH v7 03/11] dmaengine: Introduce min burst length capability Serge Semin
2020-07-09 22:45 ` [PATCH v7 04/11] dmaengine: Introduce max SG list entries capability Serge Semin
2020-07-10  8:31   ` Peter Ujfalusi
2020-07-10  9:27     ` Serge Semin
2020-07-10 11:51       ` Peter Ujfalusi
2020-07-10 16:14         ` Serge Semin
2020-07-15 11:13           ` Vinod Koul
2020-07-15 17:08             ` Serge Semin
2020-07-17  8:14               ` Vinod Koul
2020-07-17 12:36                 ` Serge Semin
2020-07-09 22:45 ` [PATCH v7 05/11] dmaengine: Introduce DMA-device device_caps callback Serge Semin
2020-07-10  8:45   ` Andy Shevchenko
2020-07-10  9:38     ` Serge Semin
2020-07-13  6:51       ` Vinod Koul
2020-07-13 20:13         ` Serge Semin
2020-07-13 20:55       ` Dave Jiang
2020-07-14 16:08         ` Vinod Koul
2020-07-14 16:18           ` Dave Jiang
2020-07-14 16:29             ` Serge Semin
2020-07-14 16:49               ` Dave Jiang
2020-07-09 22:45 ` [PATCH v7 06/11] dmaengine: dw: Take HC_LLP flag into account for noLLP auto-config Serge Semin
2020-07-09 22:45 ` [PATCH v7 07/11] dmaengine: dw: Set DMA device max segment size parameter Serge Semin
2020-07-09 22:45 ` [PATCH v7 08/11] dmaengine: dw: Add dummy device_caps callback Serge Semin
2020-07-10  8:51   ` Andy Shevchenko [this message]
2020-07-10  8:52     ` Andy Shevchenko
2020-07-10  9:45     ` Serge Semin
2020-07-15 12:01       ` Vinod Koul
2020-07-09 22:45 ` [PATCH v7 09/11] dmaengine: dw: Initialize min and max burst DMA device capability Serge Semin
2020-07-09 22:45 ` [PATCH v7 10/11] dmaengine: dw: Introduce max burst length hw config Serge Semin
2020-07-09 22:45 ` [PATCH v7 11/11] dmaengine: dw: Initialize max_sg_nents capability Serge Semin

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