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Tue, 23 Apr 2019 00:38:04 -0700 (PDT) From: Raag Jadav To: linux-i2c@vger.kernel.org Subject: [PATCH] i2c: at91: handle TXRDY interrupt spam Date: Tue, 23 Apr 2019 13:06:48 +0530 Message-Id: <1556005008-6318-1-git-send-email-raagjadav@gmail.com> X-Mailer: git-send-email 2.7.4 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20190423_003806_825788_C78AAEBB X-CRM114-Status: GOOD ( 11.79 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: alexandre.belloni@bootlin.com, linux-kernel@vger.kernel.org, ludovic.desroches@microchip.com, Raag Jadav , linux-arm-kernel@lists.infradead.org MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org Performing i2c write operation while SDA or SCL line is held or grounded by slave device, we go into infinite at91_twi_write_next_byte loop with TXRDY interrupt spam. Signed-off-by: Raag Jadav --- drivers/i2c/busses/i2c-at91.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) diff --git a/drivers/i2c/busses/i2c-at91.c b/drivers/i2c/busses/i2c-at91.c index 3f3e8b3..b2f5fdb 100644 --- a/drivers/i2c/busses/i2c-at91.c +++ b/drivers/i2c/busses/i2c-at91.c @@ -72,6 +72,7 @@ #define AT91_TWI_TXCOMP BIT(0) /* Transmission Complete */ #define AT91_TWI_RXRDY BIT(1) /* Receive Holding Register Ready */ #define AT91_TWI_TXRDY BIT(2) /* Transmit Holding Register Ready */ +#define AT91_TWI_SVREAD BIT(3) /* Slave Read */ #define AT91_TWI_OVRE BIT(6) /* Overrun Error */ #define AT91_TWI_UNRE BIT(7) /* Underrun Error */ #define AT91_TWI_NACK BIT(8) /* Not Acknowledged */ @@ -571,7 +572,10 @@ static irqreturn_t atmel_twi_interrupt(int irq, void *dev_id) at91_disable_twi_interrupts(dev); complete(&dev->cmd_complete); } else if (irqstatus & AT91_TWI_TXRDY) { - at91_twi_write_next_byte(dev); + if ((status & AT91_TWI_SVREAD) && (dev->buf_len == 0)) + at91_twi_write(dev, AT91_TWI_IDR, AT91_TWI_TXRDY); + else + at91_twi_write_next_byte(dev); } /* catch error flags */ -- 2.7.4 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel