linux-kernel - Re: [PATCH v2 3/4] dmaengine: rcar-dmac: Add helpers for clearing DMA channel status

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Date:   Tue, 26 Jan 2021 23:55:29 +0200
From:   Laurent Pinchart <laurent.pinchart@...asonboard.com>
To:     Geert Uytterhoeven <geert+renesas@...der.be>
Cc:     Vinod Koul <vkoul@...nel.org>, Rob Herring <robh+dt@...nel.org>,
        Dan Williams <dan.j.williams@...el.com>,
        Yoshihiro Shimoda <yoshihiro.shimoda.uh@...esas.com>,
        Wolfram Sang <wsa+renesas@...g-engineering.com>,
        dmaengine@...r.kernel.org, devicetree@...r.kernel.org,
        linux-renesas-soc@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 3/4] dmaengine: rcar-dmac: Add helpers for clearing
 DMA channel status

Hi Geert,

Thank you for the patch.

On Mon, Jan 25, 2021 at 03:24:30PM +0100, Geert Uytterhoeven wrote:
> Extract the code to clear the status of one or all channels into their
> own helpers, to prepare for the different handling of the R-Car V3U SoC.
> 
> Signed-off-by: Geert Uytterhoeven <geert+renesas@...der.be>

Reviewed-by: Laurent Pinchart <laurent.pinchart@...asonboard.com>

> ---
> v2:
>   - No changes.
> ---
>  drivers/dma/sh/rcar-dmac.c | 15 +++++++++++++--
>  1 file changed, 13 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/dma/sh/rcar-dmac.c b/drivers/dma/sh/rcar-dmac.c
> index 537550b4121bbc22..7a0f802c61e5152d 100644
> --- a/drivers/dma/sh/rcar-dmac.c
> +++ b/drivers/dma/sh/rcar-dmac.c
> @@ -336,6 +336,17 @@ static void rcar_dmac_chan_write(struct rcar_dmac_chan *chan, u32 reg, u32 data)
>  		writel(data, chan->iomem + reg);
>  }
>  
> +static void rcar_dmac_chan_clear(struct rcar_dmac *dmac,
> +				 struct rcar_dmac_chan *chan)
> +{
> +	rcar_dmac_write(dmac, RCAR_DMACHCLR, BIT(chan->index));
> +}
> +
> +static void rcar_dmac_chan_clear_all(struct rcar_dmac *dmac)
> +{
> +	rcar_dmac_write(dmac, RCAR_DMACHCLR, dmac->channels_mask);
> +}
> +
>  /* -----------------------------------------------------------------------------
>   * Initialization and configuration
>   */
> @@ -451,7 +462,7 @@ static int rcar_dmac_init(struct rcar_dmac *dmac)
>  	u16 dmaor;
>  
>  	/* Clear all channels and enable the DMAC globally. */
> -	rcar_dmac_write(dmac, RCAR_DMACHCLR, dmac->channels_mask);
> +	rcar_dmac_chan_clear_all(dmac);
>  	rcar_dmac_write(dmac, RCAR_DMAOR,
>  			RCAR_DMAOR_PRI_FIXED | RCAR_DMAOR_DME);
>  
> @@ -1566,7 +1577,7 @@ static irqreturn_t rcar_dmac_isr_channel(int irq, void *dev)
>  		 * because channel is already stopped in error case.
>  		 * We need to clear register and check DE bit as recovery.
>  		 */
> -		rcar_dmac_write(dmac, RCAR_DMACHCLR, 1 << chan->index);
> +		rcar_dmac_chan_clear(dmac, chan);
>  		rcar_dmac_chcr_de_barrier(chan);
>  		reinit = true;
>  		goto spin_lock_end;

-- 
Regards,

Laurent Pinchart