From mboxrd@z Thu Jan 1 00:00:00 1970 From: Jan Glauber Subject: [PATCH v7 04/15] i2c: octeon: Add flush writeq helper function Date: Mon, 25 Apr 2016 16:33:33 +0200 Message-ID: <1461594824-7215-5-git-send-email-jglauber@cavium.com> References: <1461594824-7215-1-git-send-email-jglauber@cavium.com> Return-path: In-Reply-To: <1461594824-7215-1-git-send-email-jglauber@cavium.com> Sender: linux-kernel-owner@vger.kernel.org To: Wolfram Sang Cc: linux-kernel@vger.kernel.org, linux-i2c@vger.kernel.org, David Daney , Peter Swain , Jan Glauber List-Id: linux-i2c@vger.kernel.org From: Peter Swain Add helper function that reads back a value after writing to make sure the write is finished and use it in octeon_i2c_write_int(). Signed-off-by: Peter Swain Signed-off-by: Jan Glauber --- drivers/i2c/busses/i2c-octeon.c | 9 +++++++-- 1 file changed, 7 insertions(+), 2 deletions(-) diff --git a/drivers/i2c/busses/i2c-octeon.c b/drivers/i2c/busses/i2c-octeon.c index ad563cf..60a02b2 100644 --- a/drivers/i2c/busses/i2c-octeon.c +++ b/drivers/i2c/busses/i2c-octeon.c @@ -103,6 +103,12 @@ struct octeon_i2c { struct device *dev; }; +static void octeon_i2c_writeq_flush(u64 val, void __iomem *addr) +{ + __raw_writeq(val, addr); + __raw_readq(addr); /* wait for write to land */ +} + /** * octeon_i2c_reg_write - write an I2C core register * @i2c: The struct octeon_i2c @@ -173,8 +179,7 @@ static u64 octeon_i2c_read_int(struct octeon_i2c *i2c) */ static void octeon_i2c_write_int(struct octeon_i2c *i2c, u64 data) { - __raw_writeq(data, i2c->twsi_base + TWSI_INT); - __raw_readq(i2c->twsi_base + TWSI_INT); + octeon_i2c_writeq_flush(data, i2c->twsi_base + TWSI_INT); } /** -- 1.9.1