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Nguyen" Subject: [PATCH v2 1/2] i2c: aspeed: Fix unhandled Tx done with NAK Date: Wed, 16 Jun 2021 10:10:45 +0700 Message-Id: <20210616031046.2317-2-quan@os.amperecomputing.com> X-Mailer: git-send-email 2.28.0 In-Reply-To: <20210616031046.2317-1-quan@os.amperecomputing.com> References: <20210616031046.2317-1-quan@os.amperecomputing.com> X-Originating-IP: [118.69.219.201] X-ClientProxiedBy: HKAPR03CA0001.apcprd03.prod.outlook.com (2603:1096:203:c8::6) To MW2PR0102MB3482.prod.exchangelabs.com (2603:10b6:302:c::32) MIME-Version: 1.0 X-MS-Exchange-MessageSentRepresentingType: 1 Received: from hcm-sw-17.amperecomputing.com (118.69.219.201) by HKAPR03CA0001.apcprd03.prod.outlook.com (2603:1096:203:c8::6) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.4242.9 via Frontend Transport; Wed, 16 Jun 2021 03:11:03 +0000 X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-Correlation-Id: 3a113aca-59e9-4603-6c0e-08d930746217 X-MS-TrafficTypeDiagnostic: CO2PR01MB2200: X-MS-Exchange-Transport-Forked: True X-Microsoft-Antispam-PRVS: X-MS-Oob-TLC-OOBClassifiers: OLM:1148; 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However, it is also observed that sometimes the Master issues the next transaction too quickly while the Slave IRQ handler is not yet invoked and the TX_NAK interrupt for the last byte of the previous READ_PROCESSED state has not been ack’ed. This TX_NAK interrupt is then raised together with SLAVE_MATCH interrupt and RX_DONE interrupt of the next coming transaction from Master. The Slave IRQ handler currently handles the SLAVE_MATCH and RX_DONE, but ignores the TX_NAK, causing complaints such as "aspeed-i2c-bus 1e78a040.i2c-bus: irq handled != irq. Expected 0x00000086, but was 0x00000084" This commit adds code to handle this case by emitting a SLAVE_STOP event for the TX_NAK before processing the RX_DONE for the coming transaction from the Master. Fixes: f9eb91350bb2 ("i2c: aspeed: added slave support for Aspeed I2C driver") Signed-off-by: Quan Nguyen --- v2: + Split to separate series [Joel] + Added the Fixes line [Joel] + Revised commit message [Quan] v1: + First introduced in https://lkml.org/lkml/2021/5/19/205 drivers/i2c/busses/i2c-aspeed.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/drivers/i2c/busses/i2c-aspeed.c b/drivers/i2c/busses/i2c-aspeed.c index 724bf30600d6..3fb37c3f23d4 100644 --- a/drivers/i2c/busses/i2c-aspeed.c +++ b/drivers/i2c/busses/i2c-aspeed.c @@ -254,6 +254,11 @@ static u32 aspeed_i2c_slave_irq(struct aspeed_i2c_bus *bus, u32 irq_status) /* Slave was requested, restart state machine. */ if (irq_status & ASPEED_I2CD_INTR_SLAVE_MATCH) { + if (irq_status & ASPEED_I2CD_INTR_TX_NAK && + bus->slave_state == ASPEED_I2C_SLAVE_READ_PROCESSED) { + irq_handled |= ASPEED_I2CD_INTR_TX_NAK; + i2c_slave_event(slave, I2C_SLAVE_STOP, &value); + } irq_handled |= ASPEED_I2CD_INTR_SLAVE_MATCH; bus->slave_state = ASPEED_I2C_SLAVE_START; }