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From: Sascha Hauer <s.hauer@pengutronix.de>
To: Barebox List <barebox@lists.infradead.org>
Subject: [PATCH v2 2/8] i2c: lpi2c: use udelay for timeout loops
Date: Mon,  5 Feb 2024 08:45:47 +0100	[thread overview]
Message-ID: <20240205074553.2005284-3-s.hauer@pengutronix.de> (raw)
In-Reply-To: <20240205074553.2005284-1-s.hauer@pengutronix.de>

In PBL we don't have get_time_ns() and is_timeout() available. In
preparation for adding PBL support to the driver replace the timeout
loops with udelay() which we have available in PBL.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
---
 drivers/i2c/busses/i2c-imx-lpi2c.c | 25 +++++++++++++++----------
 1 file changed, 15 insertions(+), 10 deletions(-)

diff --git a/drivers/i2c/busses/i2c-imx-lpi2c.c b/drivers/i2c/busses/i2c-imx-lpi2c.c
index 91203d90be..42f7b37143 100644
--- a/drivers/i2c/busses/i2c-imx-lpi2c.c
+++ b/drivers/i2c/busses/i2c-imx-lpi2c.c
@@ -116,7 +116,7 @@ static void lpi2c_imx_intctrl(struct lpi2c_imx_struct *lpi2c_imx,
 static int lpi2c_imx_bus_busy(struct lpi2c_imx_struct *lpi2c_imx)
 {
 	unsigned int temp;
-	u64 start = get_time_ns();
+	unsigned int timeout = 500000;
 
 	while (1) {
 		temp = readl(lpi2c_imx->base + LPI2C_MSR);
@@ -130,7 +130,8 @@ static int lpi2c_imx_bus_busy(struct lpi2c_imx_struct *lpi2c_imx)
 		if (temp & (MSR_BBF | MSR_MBF))
 			break;
 
-		if (is_timeout(start, 500 * MSECOND)) {
+		udelay(1);
+		if (!timeout--) {
 			dev_dbg(&lpi2c_imx->adapter.dev, "bus not work\n");
 			return -ETIMEDOUT;
 		}
@@ -177,7 +178,7 @@ static int lpi2c_imx_start(struct lpi2c_imx_struct *lpi2c_imx,
 static void lpi2c_imx_stop(struct lpi2c_imx_struct *lpi2c_imx)
 {
 	unsigned int temp;
-	u64 start = get_time_ns();
+	unsigned int timeout = 500000;
 
 	writel(GEN_STOP << 8, lpi2c_imx->base + LPI2C_MTDR);
 
@@ -186,7 +187,8 @@ static void lpi2c_imx_stop(struct lpi2c_imx_struct *lpi2c_imx)
 		if (temp & MSR_SDF)
 			break;
 
-		if (is_timeout(start, 500 * MSECOND)) {
+		udelay(1);
+		if (!timeout--) {
 			dev_dbg(&lpi2c_imx->adapter.dev, "stop timeout\n");
 			break;
 		}
@@ -284,7 +286,7 @@ static int lpi2c_imx_master_disable(struct lpi2c_imx_struct *lpi2c_imx)
 static int lpi2c_imx_txfifo_empty(struct lpi2c_imx_struct *lpi2c_imx)
 {
 	u32 txcnt;
-	u64 start = get_time_ns();
+	unsigned int timeout = 500000;
 
 	do {
 		txcnt = readl(lpi2c_imx->base + LPI2C_MFSR) & 0xff;
@@ -294,7 +296,8 @@ static int lpi2c_imx_txfifo_empty(struct lpi2c_imx_struct *lpi2c_imx)
 			return -EIO;
 		}
 
-		if (is_timeout(start, 500 * MSECOND)) {
+		udelay(1);
+		if (!timeout--) {
 			dev_dbg(&lpi2c_imx->adapter.dev, "txfifo empty timeout\n");
 			return -ETIMEDOUT;
 		}
@@ -326,12 +329,13 @@ static void lpi2c_imx_set_rx_watermark(struct lpi2c_imx_struct *lpi2c_imx)
 static int lpi2c_imx_write_txfifo(struct lpi2c_imx_struct *lpi2c_imx)
 {
 	unsigned int data, remaining;
-	uint64_t start = get_time_ns();
+	unsigned int timeout = 100000;;
 
 	do {
 		u32 cnt = readl(lpi2c_imx->base + LPI2C_MFSR) & 0xff;
 		if (cnt == lpi2c_imx->txfifosize) {
-			if (is_timeout(start, 100 * MSECOND))
+			udelay(1);
+			if (!timeout--)
 				return -EIO;
 			continue;
 		}
@@ -349,12 +353,13 @@ static int lpi2c_imx_read_rxfifo(struct lpi2c_imx_struct *lpi2c_imx)
 {
 	unsigned int remaining;
 	unsigned int data;
-	uint64_t start = get_time_ns();
+	unsigned int timeout = 100000;;
 
 	do {
 		data = readl(lpi2c_imx->base + LPI2C_MRDR);
 		if (data & MRDR_RXEMPTY) {
-			if (is_timeout(start, 100 * MSECOND))
+			udelay(1);
+			if (!timeout--)
 				return -EIO;
 			continue;
 		}
-- 
2.39.2




  parent reply	other threads:[~2024-02-05  7:46 UTC|newest]

Thread overview: 12+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2024-02-05  7:45 [PATCH v2 0/8] ARM: i.MX93: TQMA93xx: Add LGA variant Sascha Hauer
2024-02-05  7:45 ` [PATCH v2 1/8] i2c: lpi2c: determine clk rate during probe Sascha Hauer
2024-02-05  7:45 ` Sascha Hauer [this message]
2024-02-05  7:45 ` [PATCH v2 3/8] i2c: lpi2c: add PBL support Sascha Hauer
2024-02-05  7:45 ` [PATCH v2 4/8] pbl: eeprom: return error from eeprom_read() Sascha Hauer
2024-02-05  7:45 ` [PATCH v2 5/8] common: add TQ EEPROM support Sascha Hauer
2024-02-05  8:11   ` Marco Felsch
2024-02-05  8:18     ` Sascha Hauer
2024-02-05  7:45 ` [PATCH v2 6/8] ARM: i.MX9: add i2c base address defines Sascha Hauer
2024-02-05  7:45 ` [PATCH v2 7/8] ARM: i.MX9: rename TQ i.MX93 board to TQMA93XX Sascha Hauer
2024-02-05  7:45 ` [PATCH v2 8/8] ARM: i.MX: tqma93xx: Add LGA board variant Sascha Hauer
2024-02-08  7:19 ` [PATCH v2 0/8] ARM: i.MX93: TQMA93xx: Add LGA variant Sascha Hauer

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