From c70c5cd37413c3fa3503212d26ffdf6df535c9de Mon Sep 17 00:00:00 2001
From: Shinya Kuribayashi <shinya.kuribayashi@necel.com>
Date: Fri, 6 Nov 2009 21:47:30 +0900
Subject: [PATCH] i2c-designware: i2c_dw_xfer_msg: Fix i2c_msg search bug
In case a work-in-progress i2c_msg has more bytes to be written, we
need to set STATUS_WRITE_IN_PROGRESS and exit from the msg_write_idx-
searching loop. Otherwise, we will overtake the current msg_write_idx
without waiting for its transmission to be processed.
Signed-off-by: Shinya Kuribayashi <shinya.kuribayashi@necel.com>
Signed-off-by: Ben Dooks <ben-linux@fluff.org>
---
drivers/i2c/busses/i2c-designware.c | 20 ++++++++++++--------
1 file changed, 12 insertions(+), 8 deletions(-)
diff --git a/drivers/i2c/busses/i2c-designware.c b/drivers/i2c/busses/i2c-designware.c
index cdfd94e41ccc..bfb42f0f87a6 100644
--- a/drivers/i2c/busses/i2c-designware.c
+++ b/drivers/i2c/busses/i2c-designware.c
@@ -338,6 +338,8 @@ i2c_dw_xfer_msg(struct dw_i2c_dev *dev)
u32 addr = msgs[dev->msg_write_idx].addr;
u32 buf_len = dev->tx_buf_len;
+ intr_mask = DW_IC_INTR_STOP_DET | DW_IC_INTR_TX_ABRT;
+
if (!(dev->status & STATUS_WRITE_IN_PROGRESS)) {
/* Disable the adapter */
writel(0, dev->base + DW_IC_ENABLE);
@@ -387,17 +389,19 @@ i2c_dw_xfer_msg(struct dw_i2c_dev *dev)
dev->base + DW_IC_DATA_CMD);
tx_limit--; buf_len--;
}
+
+ dev->tx_buf_len = buf_len;
+
+ if (buf_len > 0) {
+ /* more bytes to be written */
+ intr_mask |= DW_IC_INTR_TX_EMPTY;
+ dev->status |= STATUS_WRITE_IN_PROGRESS;
+ break;
+ } else
+ dev->status &= ~STATUS_WRITE_IN_PROGRESS;
}
- intr_mask = DW_IC_INTR_STOP_DET | DW_IC_INTR_TX_ABRT;
- if (buf_len > 0) { /* more bytes to be written */
- intr_mask |= DW_IC_INTR_TX_EMPTY;
- dev->status |= STATUS_WRITE_IN_PROGRESS;
- } else
- dev->status &= ~STATUS_WRITE_IN_PROGRESS;
writel(intr_mask, dev->base + DW_IC_INTR_MASK);
-
- dev->tx_buf_len = buf_len;
}
static void
--
GitLab