linux-kernel - [PATCH v2] i2c: busses: Use min() to improve code

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Message-Id: <20250705114436.579070-1-rongqianfeng@vivo.com>
Date: Sat,  5 Jul 2025 19:44:35 +0800
From: Qianfeng Rong <rongqianfeng@...o.com>
To: Patrice Chotard <patrice.chotard@...s.st.com>,
	Andi Shyti <andi.shyti@...nel.org>,
	linux-arm-kernel@...ts.infradead.org,
	linux-i2c@...r.kernel.org,
	linux-kernel@...r.kernel.org
Cc: opensource.kernel@...o.com,
	Qianfeng Rong <rongqianfeng@...o.com>
Subject: [PATCH v2] i2c: busses: Use min() to improve code

Use min() to reduce the code and improve its readability.

The type of the max parameter in the st_i2c_rd_fill_tx_fifo()
was changed from int to u32, because the max parameter passed
in is always greater than 0.

Signed-off-by: Qianfeng Rong <rongqianfeng@...o.com>
Reviewed-by: Patrice Chotard <patrice.chotard@...s.st.com>
---
 drivers/i2c/busses/i2c-st.c | 12 +++---------
 1 file changed, 3 insertions(+), 9 deletions(-)

diff --git a/drivers/i2c/busses/i2c-st.c b/drivers/i2c/busses/i2c-st.c
index 750fff3d2389..285d8a05ab36 100644
--- a/drivers/i2c/busses/i2c-st.c
+++ b/drivers/i2c/busses/i2c-st.c
@@ -422,10 +422,7 @@ static void st_i2c_wr_fill_tx_fifo(struct st_i2c_dev *i2c_dev)
 	tx_fstat = readl_relaxed(i2c_dev->base + SSC_TX_FSTAT);
 	tx_fstat &= SSC_TX_FSTAT_STATUS;
 
-	if (c->count < (SSC_TXFIFO_SIZE - tx_fstat))
-		i = c->count;
-	else
-		i = SSC_TXFIFO_SIZE - tx_fstat;
+	i = min(c->count, SSC_TXFIFO_SIZE - tx_fstat);
 
 	for (; i > 0; i--, c->count--, c->buf++)
 		st_i2c_write_tx_fifo(i2c_dev, *c->buf);
@@ -439,7 +436,7 @@ static void st_i2c_wr_fill_tx_fifo(struct st_i2c_dev *i2c_dev)
  * This functions fills the Tx FIFO with fixed pattern when
  * in read mode to trigger clock.
  */
-static void st_i2c_rd_fill_tx_fifo(struct st_i2c_dev *i2c_dev, int max)
+static void st_i2c_rd_fill_tx_fifo(struct st_i2c_dev *i2c_dev, u32 max)
 {
 	struct st_i2c_client *c = &i2c_dev->client;
 	u32 tx_fstat, sta;
@@ -452,10 +449,7 @@ static void st_i2c_rd_fill_tx_fifo(struct st_i2c_dev *i2c_dev, int max)
 	tx_fstat = readl_relaxed(i2c_dev->base + SSC_TX_FSTAT);
 	tx_fstat &= SSC_TX_FSTAT_STATUS;
 
-	if (max < (SSC_TXFIFO_SIZE - tx_fstat))
-		i = max;
-	else
-		i = SSC_TXFIFO_SIZE - tx_fstat;
+	i = min(max, SSC_TXFIFO_SIZE - tx_fstat);
 
 	for (; i > 0; i--, c->xfered++)
 		st_i2c_write_tx_fifo(i2c_dev, 0xff);
-- 
2.34.1