i2c: rcar: use flags instead of atomic_xfer

i2c-rcar already has priv->flags.
This patch add new persistent flag ID_P_ATOMIC and use it
instead of atomic_xfer.

Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>

drivers/i2c/busses/i2c-rcar.c

@@ -106,11 +106,12 @@
 #define ID_ARBLOST	(1 << 3)
 #define ID_NACK		(1 << 4)
 /* persistent flags */
+#define ID_P_ATOMIC		BIT(27)
 #define ID_P_HOST_NOTIFY	BIT(28)
 #define ID_P_REP_AFTER_RD	BIT(29)
 #define ID_P_NO_RXDMA		BIT(30) /* HW forbids RXDMA sometimes */
 #define ID_P_PM_BLOCKED		BIT(31)
-#define ID_P_MASK		GENMASK(31, 28)
+#define ID_P_MASK		GENMASK(31, 27)
 
 enum rcar_i2c_type {
 	I2C_RCAR_GEN1,
@@ -141,7 +142,6 @@ struct rcar_i2c_priv {
 	enum dma_data_direction dma_direction;
 
 	struct reset_control *rstc;
-	bool atomic_xfer;
 	int irq;
 
 	struct i2c_client *host_notify_client;
@@ -339,7 +339,7 @@ static void rcar_i2c_prepare_msg(struct rcar_i2c_priv *priv)
 		priv->flags |= ID_LAST_MSG;
 
 	rcar_i2c_write(priv, ICMAR, i2c_8bit_addr_from_msg(priv->msg));
-	if (!priv->atomic_xfer)
+	if (!(priv->flags & ID_P_ATOMIC))
 		rcar_i2c_write(priv, ICMIER, read ? RCAR_IRQ_RECV : RCAR_IRQ_SEND);
 
 	/*
@@ -413,7 +413,7 @@ static bool rcar_i2c_dma(struct rcar_i2c_priv *priv)
 	int len;
 
 	/* Do various checks to see if DMA is feasible at all */
-	if (priv->atomic_xfer || IS_ERR(chan) || msg->len < RCAR_MIN_DMA_LEN ||
+	if ((priv->flags & ID_P_ATOMIC) || IS_ERR(chan) || msg->len < RCAR_MIN_DMA_LEN ||
 	    !(msg->flags & I2C_M_DMA_SAFE) || (read && priv->flags & ID_P_NO_RXDMA))
 		return false;
 
@@ -641,7 +641,7 @@ static irqreturn_t rcar_i2c_irq(int irq, struct rcar_i2c_priv *priv, u32 msr)
 	/* Nack */
 	if (msr & MNR) {
 		/* HW automatically sends STOP after received NACK */
-		if (!priv->atomic_xfer)
+		if (!(priv->flags & ID_P_ATOMIC))
 			rcar_i2c_write(priv, ICMIER, RCAR_IRQ_STOP);
 		priv->flags |= ID_NACK;
 		goto out;
@@ -663,7 +663,7 @@ static irqreturn_t rcar_i2c_irq(int irq, struct rcar_i2c_priv *priv, u32 msr)
 	if (priv->flags & ID_DONE) {
 		rcar_i2c_write(priv, ICMIER, 0);
 		rcar_i2c_write(priv, ICMSR, 0);
-		if (!priv->atomic_xfer)
+		if (!(priv->flags & ID_P_ATOMIC))
 			wake_up(&priv->wait);
 	}
 
@@ -681,7 +681,7 @@ static irqreturn_t rcar_i2c_gen2_irq(int irq, void *ptr)
 
 	/* Only handle interrupts that are currently enabled */
 	msr = rcar_i2c_read(priv, ICMSR);
-	if (!priv->atomic_xfer)
+	if (!(priv->flags & ID_P_ATOMIC))
 		msr &= rcar_i2c_read(priv, ICMIER);
 
 	return rcar_i2c_irq(irq, priv, msr);
@@ -694,7 +694,7 @@ static irqreturn_t rcar_i2c_gen3_irq(int irq, void *ptr)
 
 	/* Only handle interrupts that are currently enabled */
 	msr = rcar_i2c_read(priv, ICMSR);
-	if (!priv->atomic_xfer)
+	if (!(priv->flags & ID_P_ATOMIC))
 		msr &= rcar_i2c_read(priv, ICMIER);
 
 	/*
@@ -803,7 +803,7 @@ static int rcar_i2c_master_xfer(struct i2c_adapter *adap,
 	int i, ret;
 	long time_left;
 
-	priv->atomic_xfer = false;
+	priv->flags &= ~ID_P_ATOMIC
 
 	pm_runtime_get_sync(dev);
 
@@ -869,7 +869,7 @@ static int rcar_i2c_master_xfer_atomic(struct i2c_adapter *adap,
 	bool time_left;
 	int ret;
 
-	priv->atomic_xfer = true;
+	priv->flags |= ID_P_ATOMIC;
 
 	pm_runtime_get_sync(dev);