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i2c: rcar: use flags instead of atomic_xfer 

i2c-rcar already has priv->flags. This patch adds a new persistent flag
ID_P_NOT_ATOMIC and uses it to save the extra variable. The negation of
the logic was done to make the code more readable.

Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
[wsa: negated the logic, rebased, updated the commit message]
Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Signed-off-by: Wolfram Sang <wsa@kernel.org>
This commit is contained in:
Kuninori Morimoto 2022-05-20 22:29:18 +02:00 committed by Wolfram Sang
parent f0f0e07685
commit e35fb41889
1 changed files with 10 additions and 10 deletions
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20
drivers/i2c/busses/i2c-rcar.c
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@ -104,10 +104,11 @@
#define ID_NACK BIT(4)
#define ID_EPROTO BIT(5)
/* persistent flags */
#define ID_P_NOT_ATOMIC BIT(28)
#define ID_P_HOST_NOTIFY 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, 29)
#define ID_P_MASK GENMASK(31, 28)
enum rcar_i2c_type {
I2C_RCAR_GEN1,
@ -138,7 +139,6 @@ 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;
@ -350,7 +350,7 @@ 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_NOT_ATOMIC)
rcar_i2c_write(priv, ICMIER, read ? RCAR_IRQ_RECV : RCAR_IRQ_SEND);
if (rep_start)
@ -420,7 +420,7 @@ 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_NOT_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;
@ -670,7 +670,7 @@ 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_NOT_ATOMIC)
rcar_i2c_write(priv, ICMIER, RCAR_IRQ_STOP);
priv->flags |= ID_NACK;
goto out;
@ -692,7 +692,7 @@ out:
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_NOT_ATOMIC)
wake_up(&priv->wait);
}
@ -710,7 +710,7 @@ 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_NOT_ATOMIC)
msr &= rcar_i2c_read(priv, ICMIER);
return rcar_i2c_irq(irq, priv, msr);
@ -723,7 +723,7 @@ 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_NOT_ATOMIC)
msr &= rcar_i2c_read(priv, ICMIER);
/*
@ -832,7 +832,7 @@ static int rcar_i2c_master_xfer(struct i2c_adapter *adap,
int i, ret;
long time_left;
priv->atomic_xfer = false;
priv->flags |= ID_P_NOT_ATOMIC;
pm_runtime_get_sync(dev);
@ -896,7 +896,7 @@ static int rcar_i2c_master_xfer_atomic(struct i2c_adapter *adap,
bool time_left;
int ret;
priv->atomic_xfer = true;
priv->flags &= ~ID_P_NOT_ATOMIC;
pm_runtime_get_sync(dev);