Re: [PATCH v6 07/18] dmaengine: sh: rz-dmac: Add helper to check if the channel is enabled

[Tommaso Merciai]

On Tue, May 26, 2026 at 11:46:59AM +0300, Claudiu Beznea wrote:
> From: Claudiu Beznea <claudiu.beznea.uj@xxxxxxxxxxxxxx>
> 
> Add the rz_dmac_chan_is_enabled() helper to check if a channel is
> enabled. This helper will be reused in subsequent patches.
>


Tested-by: Tommaso Merciai <tommaso.merciai.xr@xxxxxxxxxxxxxx>



> Reviewed-by: Frank Li <Frank.Li@xxxxxxx>
> Tested-by: John Madieu <john.madieu.xa@xxxxxxxxxxxxxx>
> Signed-off-by: Claudiu Beznea <claudiu.beznea.uj@xxxxxxxxxxxxxx>
> ---
> 
> Changes in v6:
> - updated the patch description to describe better the changes
> - collected tags
> - s/chan/channel in rz_dmac_chan_is_enabled() to follow the naming convention
>   accross the driver for the variable of type struct rz_dmac_chan
> 
> Changes in v5:
> - none
> 
> Changes in v4:
> - none
> 
> Changes in v3:
> - none, this patch is new
> 
>  drivers/dma/sh/rz-dmac.c | 10 ++++++++--
>  1 file changed, 8 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/dma/sh/rz-dmac.c b/drivers/dma/sh/rz-dmac.c
> index d3926ecd63ac..76bac11c217c 100644
> --- a/drivers/dma/sh/rz-dmac.c
> +++ b/drivers/dma/sh/rz-dmac.c
> @@ -279,6 +279,13 @@ static void rz_dmac_lmdesc_recycle(struct rz_dmac_chan *channel)
>  	channel->lmdesc.head = lmdesc;
>  }
>  
> +static bool rz_dmac_chan_is_enabled(struct rz_dmac_chan *channel)
> +{
> +	u32 val = rz_dmac_ch_readl(channel, CHSTAT, 1);
> +
> +	return !!(val & CHSTAT_EN);
> +}
> +
>  static void rz_dmac_enable_hw(struct rz_dmac_chan *channel)
>  {
>  	struct dma_chan *chan = &channel->vc.chan;
> @@ -840,8 +847,7 @@ static int rz_dmac_device_pause(struct dma_chan *chan)
>  
>  	guard(spinlock_irqsave)(&channel->vc.lock);
>  
> -	val = rz_dmac_ch_readl(channel, CHSTAT, 1);
> -	if (!(val & CHSTAT_EN))
> +	if (!rz_dmac_chan_is_enabled(channel))
>  		return 0;
>  
>  	rz_dmac_ch_writel(channel, CHCTRL_SETSUS, CHCTRL, 1);
> -- 
> 2.43.0
>