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Commit 30c24b25 authored by Peter Swain's avatar Peter Swain Committed by Wolfram Sang
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i2c: octeon: Add flush writeq helper function 



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: default avatarPeter Swain <pswain@cavium.com>
Signed-off-by: default avatarJan Glauber <jglauber@cavium.com>
Signed-off-by: default avatarWolfram Sang <wsa@the-dreams.de>
parent c981e34e

drivers/i2c/busses/i2c-octeon.c

+7 −2
Original line number Diff line number Diff line
@@ -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
@@ -172,8 +178,7 @@ 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);

}



/**