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

[Claudiu Beznea]

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.

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