scb_wr_rd_fence moved to before reading from fifo and writing to fifo to make sure the the first read/write is done after the required number of cycles.
Fixes: 27bce457d588 (i2c: img-scb: Add Imagination Technologies I2C SCB driver) Signed-off-by: Sifan Naeem <[email protected]> Cc: <[email protected]> --- drivers/i2c/busses/i2c-img-scb.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/i2c/busses/i2c-img-scb.c b/drivers/i2c/busses/i2c-img-scb.c index 3c1dcd2..42114a8 100644 --- a/drivers/i2c/busses/i2c-img-scb.c +++ b/drivers/i2c/busses/i2c-img-scb.c @@ -536,6 +536,7 @@ static void img_i2c_read_fifo(struct img_i2c *i2c) u32 fifo_status; u8 data; + img_i2c_wr_rd_fence(i2c); fifo_status = img_i2c_readl(i2c, SCB_FIFO_STATUS_REG); if (fifo_status & FIFO_READ_EMPTY) break; @@ -544,7 +545,6 @@ static void img_i2c_read_fifo(struct img_i2c *i2c) *i2c->msg.buf = data; img_i2c_writel(i2c, SCB_READ_FIFO_REG, 0xff); - img_i2c_wr_rd_fence(i2c); i2c->msg.len--; i2c->msg.buf++; } @@ -556,12 +556,12 @@ static void img_i2c_write_fifo(struct img_i2c *i2c) while (i2c->msg.len) { u32 fifo_status; + img_i2c_wr_rd_fence(i2c); fifo_status = img_i2c_readl(i2c, SCB_FIFO_STATUS_REG); if (fifo_status & FIFO_WRITE_FULL) break; img_i2c_writel(i2c, SCB_WRITE_DATA_REG, *i2c->msg.buf); - img_i2c_wr_rd_fence(i2c); i2c->msg.len--; i2c->msg.buf++; } -- 1.7.9.5 -- To unsubscribe from this list: send the line "unsubscribe stable" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
