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From: Eddie James <eajames@linux.ibm.com>
To: linux-fsi@lists.ozlabs.org
Cc: linux-kernel@vger.kernel.org, linux-i2c@vger.kernel.org,
        linux-clk@vger.kernel.org, devicetree@vger.kernel.org,
        andi.shyti@kernel.org, eajames@linux.ibm.com, alistair@popple.id.au,
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        mturquette@baylibre.com, robh@kernel.org,
        krzysztof.kozlowski+dt@linaro.org, conor+dt@kernel.org
Subject: [PATCH 32/33] i2c: fsi: Add boolean for skip stop command on abort
Date: Thu, 15 Feb 2024 16:07:58 -0600
Message-Id: <20240215220759.976998-33-eajames@linux.ibm.com>
In-Reply-To: <20240215220759.976998-1-eajames@linux.ibm.com>
References: <20240215220759.976998-1-eajames@linux.ibm.com>
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In preparation for interrupt support, store whether to skip the
final stop command during the abort procedure instead of checking
the previously read status register in the abort function.

Signed-off-by: Eddie James <eajames@linux.ibm.com>
---
 drivers/i2c/busses/i2c-fsi.c | 18 +++++++++++-------
 1 file changed, 11 insertions(+), 7 deletions(-)

diff --git a/drivers/i2c/busses/i2c-fsi.c b/drivers/i2c/busses/i2c-fsi.c
index 5f524fb6f0f8..33f4e64cb60b 100644
--- a/drivers/i2c/busses/i2c-fsi.c
+++ b/drivers/i2c/busses/i2c-fsi.c
@@ -116,6 +116,9 @@
 #define I2C_STAT_ANY_RESP	(I2C_STAT_ERR |				\
 				 I2C_STAT_DAT_REQ |			\
 				 I2C_STAT_CMD_COMP)
+#define I2C_STAT_SKIP_STOP	(I2C_STAT_PARITY |			\
+				 I2C_STAT_LOST_ARB |			\
+				 I2C_STAT_STOP_ERR)
 
 /* extended status register */
 #define I2C_ESTAT_FIFO_SZ	GENMASK(31, 24)
@@ -150,6 +153,7 @@ struct fsi_i2c_master {
 	struct mutex		lock;
 	u32			clock_div;
 	u8			fifo_size;
+	bool			skip_stop;
 };
 
 struct fsi_i2c_port {
@@ -459,31 +463,30 @@ static int fsi_i2c_reset_engine(struct fsi_i2c_master *i2c, u16 port)
 	return 0;
 }
 
-static int fsi_i2c_abort(struct fsi_i2c_port *port, u32 status)
+static int fsi_i2c_abort(struct fsi_i2c_port *port)
 {
 	struct fsi_i2c_master *i2c = port->master;
 	u32 cmd = I2C_CMD_WITH_STOP;
 	unsigned long start;
-	u32 stat;
+	u32 status;
 	int rc;
 
 	rc = fsi_i2c_reset_engine(i2c, port->port);
 	if (rc)
 		return rc;
 
-	rc = fsi_i2c_read_reg(i2c->fsi, I2C_FSI_STAT, &stat);
+	rc = fsi_i2c_read_reg(i2c->fsi, I2C_FSI_STAT, &status);
 	if (rc)
 		return rc;
 
 	/* if sda is low, peform full bus reset */
-	if (!(stat & I2C_STAT_SDA_IN)) {
+	if (!(status & I2C_STAT_SDA_IN)) {
 		rc = fsi_i2c_reset_bus(i2c, port);
 		if (rc)
 			return rc;
 	}
 
-	/* skip final stop command for these errors */
-	if (status & (I2C_STAT_PARITY | I2C_STAT_LOST_ARB | I2C_STAT_STOP_ERR))
+	if (i2c->skip_stop)
 		return 0;
 
 	/* write stop command */
@@ -534,7 +537,8 @@ static int fsi_i2c_handle_status(struct fsi_i2c_port *port,
 	int rc;
 
 	if (status & I2C_STAT_ERR) {
-		rc = fsi_i2c_abort(port, status);
+		port->master->skip_stop = status & I2C_STAT_SKIP_STOP;
+		rc = fsi_i2c_abort(port);
 		if (rc)
 			return rc;
 
-- 
2.39.3