linux-kernel - Re: [PATCH v2 06/12] dmaengine: sun6i: make gate bit in sun8i's DMA engines a common quirk

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Message-ID: <20170314041013.GB2843@localhost>
Date:   Tue, 14 Mar 2017 09:40:13 +0530
From:   Vinod Koul <vinod.koul@...el.com>
To:     Icenowy Zheng <icenowy@...c.xyz>
Cc:     Rob Herring <robh+dt@...nel.org>,
        Maxime Ripard <maxime.ripard@...e-electrons.com>,
        Chen-Yu Tsai <wens@...e.org>, Mark Brown <broonie@...nel.org>,
        dmaengine@...r.kernel.org, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        alsa-devel@...a-project.org, linux-sunxi@...glegroups.com
Subject: Re: [PATCH v2 06/12] dmaengine: sun6i: make gate bit in sun8i's DMA
 engines a common quirk

On Sun, Mar 05, 2017 at 09:37:03PM +0800, Icenowy Zheng wrote:
> Originally we enable a special gate bit when the compatible indicates
> A23/33.
> 
> But according to BSP sources and user manuals, more SoCs will need this
> gate bit.
> 
> So make it a common quirk configured in the config struct.
> 
> The BSP source also indicates that A83T will need this gate bit (there's
> "SUN8IW6" in the #ifdef's), so also enable this gate bit for it.
> 
> Signed-off-by: Icenowy Zheng <icenowy@...c.xyz>
> ---
>  drivers/dma/sun6i-dma.c | 9 ++++++---
>  1 file changed, 6 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/dma/sun6i-dma.c b/drivers/dma/sun6i-dma.c
> index a2358780ab2c..889fb24023cd 100644
> --- a/drivers/dma/sun6i-dma.c
> +++ b/drivers/dma/sun6i-dma.c
> @@ -101,6 +101,7 @@ struct sun6i_dma_config {
>  	u32 nr_max_channels;
>  	u32 nr_max_requests;
>  	u32 nr_max_vchans;
> +	bool gate_needed;

can you please explain what gate means here

-- 
~Vinod