linux-kernel - [PATCH v3] i2c: aspeed: Update the stop sw state when the bus recovery occurs

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Message-ID: <20240911093951.1674824-1-tommy_huang@aspeedtech.com>
Date: Wed, 11 Sep 2024 17:39:51 +0800
From: Tommy Huang <tommy_huang@...eedtech.com>
To: <brendan.higgins@...ux.dev>, <benh@...nel.crashing.org>, <joel@....id.au>,
	<andi.shyti@...nel.org>, <andrew@...econstruct.com.au>, <wsa@...nel.org>
CC: <linux-i2c@...r.kernel.org>, <openbmc@...ts.ozlabs.org>,
	<linux-arm-kernel@...ts.infradead.org>, <linux-aspeed@...ts.ozlabs.org>,
	<linux-kernel@...r.kernel.org>, <stable@...r.kernel.org>,
	<BMC-SW@...eedtech.com>
Subject: [PATCH v3] i2c: aspeed: Update the stop sw state when the bus recovery occurs

When the i2c bus recovery occurs, driver will send i2c stop command
in the scl low condition. In this case the sw state will still keep
original situation. Under multi-master usage, i2c bus recovery will
be called when i2c transfer timeout occurs. Update the stop command
calling with aspeed_i2c_do_stop function to update master_state.

Fixes: f327c686d3ba ("i2c: aspeed: added driver for Aspeed I2C")

Cc: <stable@...r.kernel.org> # v4.13+
Signed-off-by: Tommy Huang <tommy_huang@...eedtech.com>
---
 drivers/i2c/busses/i2c-aspeed.c | 16 ++++++++--------
 1 file changed, 8 insertions(+), 8 deletions(-)

diff --git a/drivers/i2c/busses/i2c-aspeed.c b/drivers/i2c/busses/i2c-aspeed.c
index ce8c4846b7fa..2a03a221e2dd 100644
--- a/drivers/i2c/busses/i2c-aspeed.c
+++ b/drivers/i2c/busses/i2c-aspeed.c
@@ -170,6 +170,13 @@ struct aspeed_i2c_bus {
 
 static int aspeed_i2c_reset(struct aspeed_i2c_bus *bus);
 
+/* precondition: bus.lock has been acquired. */
+static void aspeed_i2c_do_stop(struct aspeed_i2c_bus *bus)
+{
+	bus->master_state = ASPEED_I2C_MASTER_STOP;
+	writel(ASPEED_I2CD_M_STOP_CMD, bus->base + ASPEED_I2C_CMD_REG);
+}
+
 static int aspeed_i2c_recover_bus(struct aspeed_i2c_bus *bus)
 {
 	unsigned long time_left, flags;
@@ -187,7 +194,7 @@ static int aspeed_i2c_recover_bus(struct aspeed_i2c_bus *bus)
 			command);
 
 		reinit_completion(&bus->cmd_complete);
-		writel(ASPEED_I2CD_M_STOP_CMD, bus->base + ASPEED_I2C_CMD_REG);
+		aspeed_i2c_do_stop(bus);
 		spin_unlock_irqrestore(&bus->lock, flags);
 
 		time_left = wait_for_completion_timeout(
@@ -390,13 +397,6 @@ static void aspeed_i2c_do_start(struct aspeed_i2c_bus *bus)
 	writel(command, bus->base + ASPEED_I2C_CMD_REG);
 }
 
-/* precondition: bus.lock has been acquired. */
-static void aspeed_i2c_do_stop(struct aspeed_i2c_bus *bus)
-{
-	bus->master_state = ASPEED_I2C_MASTER_STOP;
-	writel(ASPEED_I2CD_M_STOP_CMD, bus->base + ASPEED_I2C_CMD_REG);
-}
-
 /* precondition: bus.lock has been acquired. */
 static void aspeed_i2c_next_msg_or_stop(struct aspeed_i2c_bus *bus)
 {
-- 
2.25.1