From ad0194e8d624df67a970a36e8ef9e61514e25553 Mon Sep 17 00:00:00 2001
From: Luotao Fu <l.fu@pengutronix.de>
Date: Mon, 1 Mar 2010 13:24:24 +0100
Subject: [PATCH] i2c-pnx: fix setting start/stop condition
The start/stop condtions are set in different places repetedly in the i2c-pnx
driver. Beside in i2c_pnx_start and i2c_pnx_stop the start/stop bit are also
set during the transfer of a i2c message in the master_xmit/rcv calls. This is
wrong since we can't set the start/stop condition during the transaction of a
single message any way. As a matter of fact, the driver will sometimes set both
the start and the stop bits at one time. This can be easily reproduced by
sending a simple read request like e.g
struct i2c_msg msgs[] = {
{ addr, 0, 1, buf },
{ addr, I2C_M_RD, offset, buf }
};
While processing the first message the i2c_pnx_master_xmit will set both the
start_bit and the stop_bit, which will eventually confuse the slave.
Fixed by remove setting start/stop condition from the transmit routines.
Signed-off-by: Luotao Fu <l.fu@pengutronix.de>
Signed-off-by: Ben Dooks <ben-linux@fluff.org>
---
drivers/i2c/busses/i2c-pnx.c | 11 -----------
1 file changed, 11 deletions(-)
diff --git a/drivers/i2c/busses/i2c-pnx.c b/drivers/i2c/busses/i2c-pnx.c
index 2b0bd0b042d6df..9532dee6b580b8 100644
--- a/drivers/i2c/busses/i2c-pnx.c
+++ b/drivers/i2c/busses/i2c-pnx.c
@@ -172,12 +172,6 @@ static int i2c_pnx_master_xmit(struct i2c_pnx_algo_data *alg_data)
/* We still have something to talk about... */
val = *alg_data->mif.buf++;
- if (alg_data->mif.len == 1) {
- val |= stop_bit;
- if (!alg_data->last)
- val |= start_bit;
- }
-
alg_data->mif.len--;
iowrite32(val, I2C_REG_TX(alg_data));
@@ -251,11 +245,6 @@ static int i2c_pnx_master_rcv(struct i2c_pnx_algo_data *alg_data)
__func__);
if (alg_data->mif.len == 1) {
- /* Last byte, do not acknowledge next rcv. */
- val |= stop_bit;
- if (!alg_data->last)
- val |= start_bit;
-
/*
* Enable interrupt RFDAIE (data in Rx fifo),
* and disable DRMIE (need data for Tx)
--
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