diff options
| author | Sifan Naeem | 2015-09-10 15:50:02 +0100 |
|---|---|---|
| committer | Wolfram Sang | 2015-10-10 08:38:06 +0100 |
| commit | 2aefb1bd4101235be7d9f0d5ac8d56aa979f6081 (patch) | |
| tree | 951f72f9c42c8829ece13c40d95ea16344f7f1e0 | |
| parent | 0e59378bc05b084939af54d2066552ac42fa0fee (diff) | |
i2c: img-scb: do dummy writes before fifo access
Move scb_wr_rd_fence 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: commit 27bce457d588 ("i2c: img-scb: Add Imagination Technologies I2C SCB driver")
Signed-off-by: Sifan Naeem <sifan.naeem@imgtec.com>
Acked-by: James Hogan <james.hogan@imgtec.com>
Reviewed-by: James Hartley <james.hartley@imgtec.com>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
| -rw-r--r-- | drivers/i2c/busses/i2c-img-scb.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/drivers/i2c/busses/i2c-img-scb.c b/drivers/i2c/busses/i2c-img-scb.c index 5c3c61586d4a..0368d91b6805 100644 --- a/drivers/i2c/busses/i2c-img-scb.c +++ b/drivers/i2c/busses/i2c-img-scb.c @@ -534,6 +534,7 @@ 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; @@ -542,7 +543,6 @@ 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++; } @@ -554,12 +554,12 @@ 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++; } |