From mboxrd@z Thu Jan 1 00:00:00 1970 From: Sifan Naeem Subject: [PATCH v3 3/5] i2c: img-scb: add handle for stop detected interrupt Date: Thu, 19 Nov 2015 09:35:15 +0000 Message-ID: <1447925717-25297-4-git-send-email-sifan.naeem@imgtec.com> References: <1447925717-25297-1-git-send-email-sifan.naeem@imgtec.com> Mime-Version: 1.0 Content-Type: text/plain Return-path: Received: from mailapp01.imgtec.com ([195.59.15.196]:42999 "EHLO mailapp01.imgtec.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1757770AbbKSJfW (ORCPT ); Thu, 19 Nov 2015 04:35:22 -0500 In-Reply-To: <1447925717-25297-1-git-send-email-sifan.naeem@imgtec.com> Sender: linux-i2c-owner@vger.kernel.org List-Id: linux-i2c@vger.kernel.org To: Wolfram Sang , James Hogan , linux-i2c@vger.kernel.org, Ezequiel Garcia Cc: Sifan Naeem Stop Detected interrupt is triggered when a Stop bit is detected on the bus, which indicates the end of the current transfer. When the end of a transfer is indicated by the Stop Detected interrupt, drain the FIFO and signal completion for the transaction. Signed-off-by: Sifan Naeem --- drivers/i2c/busses/i2c-img-scb.c | 11 ++++++++++- 1 file changed, 10 insertions(+), 1 deletion(-) diff --git a/drivers/i2c/busses/i2c-img-scb.c b/drivers/i2c/busses/i2c-img-scb.c index 0af554a16ae5..f416010a0b49 100644 --- a/drivers/i2c/busses/i2c-img-scb.c +++ b/drivers/i2c/busses/i2c-img-scb.c @@ -152,6 +152,7 @@ #define INT_TRANSACTION_DONE BIT(15) #define INT_SLAVE_EVENT BIT(16) #define INT_TIMING BIT(18) +#define INT_STOP_DETECTED BIT(19) #define INT_FIFO_FULL_FILLING (INT_FIFO_FULL | INT_FIFO_FILLING) @@ -175,7 +176,8 @@ INT_WRITE_ACK_ERR | \ INT_FIFO_FULL | \ INT_FIFO_FILLING | \ - INT_FIFO_EMPTY) + INT_FIFO_EMPTY | \ + INT_STOP_DETECTED) #define INT_ENABLE_MASK_WAITSTOP (INT_SLAVE_EVENT | \ INT_ADDR_ACK_ERR | \ @@ -865,6 +867,13 @@ static unsigned int img_i2c_auto(struct img_i2c *i2c, mod_timer(&i2c->check_timer, jiffies + msecs_to_jiffies(1)); + if (int_status & INT_STOP_DETECTED) { + /* Drain remaining data in FIFO and complete transaction */ + if (i2c->msg.flags & I2C_M_RD) + img_i2c_read_fifo(i2c); + return ISR_COMPLETE(0); + } + if (i2c->msg.flags & I2C_M_RD) { if (int_status & INT_FIFO_FULL_FILLING) { img_i2c_read_fifo(i2c); -- 1.7.9.5