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From: Quan Nguyen <quan@os.amperecomputing.com>
To: Corey Minyard <minyard@acm.org>, Rob Herring <robh+dt@kernel.org>,
	Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>,
	Joel Stanley <joel@jms.id.au>, Andrew Jeffery <andrew@aj.id.au>,
	Brendan Higgins <brendanhiggins@google.com>,
	Benjamin Herrenschmidt <benh@kernel.crashing.org>,
	Wolfram Sang <wsa@kernel.org>,
	openipmi-developer@lists.sourceforge.net,
	devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
	linux-aspeed@lists.ozlabs.org, linux-kernel@vger.kernel.org,
	linux-i2c@vger.kernel.org, openbmc@lists.ozlabs.org
Cc: Open Source Submission <patches@amperecomputing.com>,
	Phong Vo <phong@os.amperecomputing.com>,
	"Thang Q . Nguyen" <thang@os.amperecomputing.com>
Subject: [PATCH v6 4/4] i2c: aspeed: Assert NAK when slave is busy
Date: Thu, 10 Mar 2022 18:41:19 +0700	[thread overview]
Message-ID: <20220310114119.13736-5-quan@os.amperecomputing.com> (raw)
In-Reply-To: <20220310114119.13736-1-quan@os.amperecomputing.com>

When processing I2C_SLAVE_WRITE_REQUESTED event, if slave returns
-EBUSY, i2c controller should issue RxCmdLast command to assert NAK
on the bus.

Signed-off-by: Quan Nguyen <quan@os.amperecomputing.com>
---
v6:
  + New introduced in v6                      [Quan]

 drivers/i2c/busses/i2c-aspeed.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/i2c/busses/i2c-aspeed.c b/drivers/i2c/busses/i2c-aspeed.c
index 771e53d3d197..ebc2b92656c8 100644
--- a/drivers/i2c/busses/i2c-aspeed.c
+++ b/drivers/i2c/busses/i2c-aspeed.c
@@ -244,6 +244,7 @@ static u32 aspeed_i2c_slave_irq(struct aspeed_i2c_bus *bus, u32 irq_status)
 	u32 command, irq_handled = 0;
 	struct i2c_client *slave = bus->slave;
 	u8 value;
+	int ret;
 
 	if (!slave)
 		return 0;
@@ -311,7 +312,9 @@ static u32 aspeed_i2c_slave_irq(struct aspeed_i2c_bus *bus, u32 irq_status)
 		break;
 	case ASPEED_I2C_SLAVE_WRITE_REQUESTED:
 		bus->slave_state = ASPEED_I2C_SLAVE_WRITE_RECEIVED;
-		i2c_slave_event(slave, I2C_SLAVE_WRITE_REQUESTED, &value);
+		ret = i2c_slave_event(slave, I2C_SLAVE_WRITE_REQUESTED, &value);
+		if (ret == -EBUSY)
+			writel(ASPEED_I2CD_M_S_RX_CMD_LAST, bus->base + ASPEED_I2C_CMD_REG);
 		break;
 	case ASPEED_I2C_SLAVE_WRITE_RECEIVED:
 		i2c_slave_event(slave, I2C_SLAVE_WRITE_RECEIVED, &value);
-- 
2.35.1


WARNING: multiple messages have this Message-ID (diff)
From: Quan Nguyen <quan@os.amperecomputing.com>
To: Corey Minyard <minyard@acm.org>, Rob Herring <robh+dt@kernel.org>,
	Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>,
	Joel Stanley <joel@jms.id.au>, Andrew Jeffery <andrew@aj.id.au>,
	Brendan Higgins <brendanhiggins@google.com>,
	Benjamin Herrenschmidt <benh@kernel.crashing.org>,
	Wolfram Sang <wsa@kernel.org>,
	openipmi-developer@lists.sourceforge.net,
	devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
	linux-aspeed@lists.ozlabs.org, linux-kernel@vger.kernel.org,
	linux-i2c@vger.kernel.org, openbmc@lists.ozlabs.org
Cc: Open Source Submission <patches@amperecomputing.com>,
	Phong Vo <phong@os.amperecomputing.com>,
	"Thang Q . Nguyen" <thang@os.amperecomputing.com>
Subject: [PATCH v6 4/4] i2c: aspeed: Assert NAK when slave is busy
Date: Thu, 10 Mar 2022 18:41:19 +0700	[thread overview]
Message-ID: <20220310114119.13736-5-quan@os.amperecomputing.com> (raw)
In-Reply-To: <20220310114119.13736-1-quan@os.amperecomputing.com>

When processing I2C_SLAVE_WRITE_REQUESTED event, if slave returns
-EBUSY, i2c controller should issue RxCmdLast command to assert NAK
on the bus.

Signed-off-by: Quan Nguyen <quan@os.amperecomputing.com>
---
v6:
  + New introduced in v6                      [Quan]

 drivers/i2c/busses/i2c-aspeed.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/i2c/busses/i2c-aspeed.c b/drivers/i2c/busses/i2c-aspeed.c
index 771e53d3d197..ebc2b92656c8 100644
--- a/drivers/i2c/busses/i2c-aspeed.c
+++ b/drivers/i2c/busses/i2c-aspeed.c
@@ -244,6 +244,7 @@ static u32 aspeed_i2c_slave_irq(struct aspeed_i2c_bus *bus, u32 irq_status)
 	u32 command, irq_handled = 0;
 	struct i2c_client *slave = bus->slave;
 	u8 value;
+	int ret;
 
 	if (!slave)
 		return 0;
@@ -311,7 +312,9 @@ static u32 aspeed_i2c_slave_irq(struct aspeed_i2c_bus *bus, u32 irq_status)
 		break;
 	case ASPEED_I2C_SLAVE_WRITE_REQUESTED:
 		bus->slave_state = ASPEED_I2C_SLAVE_WRITE_RECEIVED;
-		i2c_slave_event(slave, I2C_SLAVE_WRITE_REQUESTED, &value);
+		ret = i2c_slave_event(slave, I2C_SLAVE_WRITE_REQUESTED, &value);
+		if (ret == -EBUSY)
+			writel(ASPEED_I2CD_M_S_RX_CMD_LAST, bus->base + ASPEED_I2C_CMD_REG);
 		break;
 	case ASPEED_I2C_SLAVE_WRITE_RECEIVED:
 		i2c_slave_event(slave, I2C_SLAVE_WRITE_RECEIVED, &value);
-- 
2.35.1


_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

WARNING: multiple messages have this Message-ID (diff)
From: Quan Nguyen <quan@os.amperecomputing.com>
To: Corey Minyard <minyard@acm.org>, Rob Herring <robh+dt@kernel.org>,
	Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>,
	Joel Stanley <joel@jms.id.au>, Andrew Jeffery <andrew@aj.id.au>,
	Brendan Higgins <brendanhiggins@google.com>,
	Benjamin Herrenschmidt <benh@kernel.crashing.org>,
	Wolfram Sang <wsa@kernel.org>,
	openipmi-developer@lists.sourceforge.net,
	devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
	linux-aspeed@lists.ozlabs.org, linux-kernel@vger.kernel.org,
	linux-i2c@vger.kernel.org, openbmc@lists.ozlabs.org
Cc: Open Source Submission <patches@amperecomputing.com>,
	"Thang Q . Nguyen" <thang@os.amperecomputing.com>,
	Phong Vo <phong@os.amperecomputing.com>
Subject: [PATCH v6 4/4] i2c: aspeed: Assert NAK when slave is busy
Date: Thu, 10 Mar 2022 18:41:19 +0700	[thread overview]
Message-ID: <20220310114119.13736-5-quan@os.amperecomputing.com> (raw)
In-Reply-To: <20220310114119.13736-1-quan@os.amperecomputing.com>

When processing I2C_SLAVE_WRITE_REQUESTED event, if slave returns
-EBUSY, i2c controller should issue RxCmdLast command to assert NAK
on the bus.

Signed-off-by: Quan Nguyen <quan@os.amperecomputing.com>
---
v6:
  + New introduced in v6                      [Quan]

 drivers/i2c/busses/i2c-aspeed.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/i2c/busses/i2c-aspeed.c b/drivers/i2c/busses/i2c-aspeed.c
index 771e53d3d197..ebc2b92656c8 100644
--- a/drivers/i2c/busses/i2c-aspeed.c
+++ b/drivers/i2c/busses/i2c-aspeed.c
@@ -244,6 +244,7 @@ static u32 aspeed_i2c_slave_irq(struct aspeed_i2c_bus *bus, u32 irq_status)
 	u32 command, irq_handled = 0;
 	struct i2c_client *slave = bus->slave;
 	u8 value;
+	int ret;
 
 	if (!slave)
 		return 0;
@@ -311,7 +312,9 @@ static u32 aspeed_i2c_slave_irq(struct aspeed_i2c_bus *bus, u32 irq_status)
 		break;
 	case ASPEED_I2C_SLAVE_WRITE_REQUESTED:
 		bus->slave_state = ASPEED_I2C_SLAVE_WRITE_RECEIVED;
-		i2c_slave_event(slave, I2C_SLAVE_WRITE_REQUESTED, &value);
+		ret = i2c_slave_event(slave, I2C_SLAVE_WRITE_REQUESTED, &value);
+		if (ret == -EBUSY)
+			writel(ASPEED_I2CD_M_S_RX_CMD_LAST, bus->base + ASPEED_I2C_CMD_REG);
 		break;
 	case ASPEED_I2C_SLAVE_WRITE_RECEIVED:
 		i2c_slave_event(slave, I2C_SLAVE_WRITE_RECEIVED, &value);
-- 
2.35.1


  parent reply	other threads:[~2022-03-10 11:42 UTC|newest]

Thread overview: 42+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-03-10 11:41 [PATCH v6 0/4] Add SSIF BMC driver Quan Nguyen
2022-03-10 11:41 ` Quan Nguyen
2022-03-10 11:41 ` Quan Nguyen
2022-03-10 11:41 ` [PATCH v6 1/4] ipmi: ssif_bmc: " Quan Nguyen
2022-03-10 11:41   ` Quan Nguyen
2022-03-10 11:41   ` Quan Nguyen
2022-03-11  1:19   ` Corey Minyard
2022-03-11  1:19     ` Corey Minyard
2022-03-11  1:19     ` Corey Minyard
2022-03-17  8:30     ` Quan Nguyen
2022-03-17  8:30       ` Quan Nguyen
2022-03-17  8:30       ` Quan Nguyen
2022-03-17 13:13       ` Corey Minyard
2022-03-17 13:13         ` Corey Minyard
2022-03-17 13:13         ` Corey Minyard
2022-04-08  4:40         ` Quan Nguyen
2022-04-08  4:40           ` Quan Nguyen
2022-04-08  4:40           ` Quan Nguyen
2022-03-11  6:20   ` kernel test robot
2022-03-11  6:20     ` kernel test robot
2022-03-11  6:20     ` kernel test robot
2022-03-14 18:15   ` Jae Hyun Yoo
2022-03-14 18:15     ` Jae Hyun Yoo
2022-03-17  9:00     ` Quan Nguyen
2022-03-17  9:00       ` Quan Nguyen
2022-03-10 11:41 ` [PATCH v6 2/4] bindings: ipmi: Add binding for " Quan Nguyen
2022-03-10 11:41   ` Quan Nguyen
2022-03-10 11:41   ` Quan Nguyen
2022-03-10 11:41 ` [PATCH v6 3/4] ipmi: ssif_bmc: Return -EFAULT if copy_from_user() fails Quan Nguyen
2022-03-10 11:41   ` Quan Nguyen
2022-03-10 11:41   ` Quan Nguyen
2022-03-11  6:58   ` Wolfram Sang
2022-03-11  6:58     ` Wolfram Sang
2022-03-11  6:58     ` Wolfram Sang
2022-03-17  7:45     ` Quan Nguyen
2022-03-17  7:45       ` Quan Nguyen
2022-03-17  8:38       ` Dan Carpenter
2022-03-17  8:38         ` Dan Carpenter
2022-03-17  8:38         ` Dan Carpenter
2022-03-10 11:41 ` Quan Nguyen [this message]
2022-03-10 11:41   ` [PATCH v6 4/4] i2c: aspeed: Assert NAK when slave is busy Quan Nguyen
2022-03-10 11:41   ` Quan Nguyen

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