Minki/linux
1
0
Fork 1
mirror of https://github.com/torvalds/linux.git synced 2024-12-12 06:02:38 +00:00
Code Issues Packages Projects Releases Wiki Activity

i2c: imx: Simplify stopped state tracking

Browse Source 
Always update the stopped state when busy status have been checked.
This is identical to what was done before, with the exception of error
handling.
Without this change, some errors cause the stopped state to be left in
incorrect state in i2c_imx_stop(), i2c_imx_dma_read(), i2c_imx_read() and
i2c_imx_xfer().

Signed-off-by: Esben Haabendal <eha@deif.com>
Acked-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
This commit is contained in:
Esben Haabendal 2018-08-16 10:43:13 +02:00 committed by Wolfram Sang
parent bed4ff1ed4
commit ef456a2de3
1 changed files with 7 additions and 8 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

15
drivers/i2c/busses/i2c-imx.c
View File

@ -420,10 +420,14 @@ static int i2c_imx_bus_busy(struct imx_i2c_struct *i2c_imx, int for_busy)
return -EAGAIN;
}
if (for_busy && (temp & I2SR_IBB))
if (for_busy && (temp & I2SR_IBB)) {
i2c_imx->stopped = 0;
break;
if (!for_busy && !(temp & I2SR_IBB))
}
if (!for_busy && !(temp & I2SR_IBB)) {
i2c_imx->stopped = 1;
break;
}
if (time_after(jiffies, orig_jiffies + msecs_to_jiffies(500))) {
dev_dbg(&i2c_imx->adapter.dev,
"<%s> I2C bus is busy\n", __func__);
@ -537,7 +541,6 @@ static int i2c_imx_start(struct imx_i2c_struct *i2c_imx)
result = i2c_imx_bus_busy(i2c_imx, 1);
if (result)
return result;
i2c_imx->stopped = 0;
temp |= I2CR_IIEN | I2CR_MTX | I2CR_TXAK;
temp &= ~I2CR_DMAEN;
@ -566,10 +569,8 @@ static void i2c_imx_stop(struct imx_i2c_struct *i2c_imx)
udelay(i2c_imx->disable_delay);
}
if (!i2c_imx->stopped) {
if (!i2c_imx->stopped)
i2c_imx_bus_busy(i2c_imx, 0);
i2c_imx->stopped = 1;
}
/* Disable I2C controller */
temp = i2c_imx->hwdata->i2cr_ien_opcode ^ I2CR_IEN,
@ -725,7 +726,6 @@ static int i2c_imx_dma_read(struct imx_i2c_struct *i2c_imx,
temp &= ~(I2CR_MSTA | I2CR_MTX);
imx_i2c_write_reg(temp, i2c_imx, IMX_I2C_I2CR);
i2c_imx_bus_busy(i2c_imx, 0);
i2c_imx->stopped = 1;
} else {
/*
* For i2c master receiver repeat restart operation like:
@ -851,7 +851,6 @@ static int i2c_imx_read(struct imx_i2c_struct *i2c_imx, struct i2c_msg *msgs, bo
temp &= ~(I2CR_MSTA | I2CR_MTX);
imx_i2c_write_reg(temp, i2c_imx, IMX_I2C_I2CR);
i2c_imx_bus_busy(i2c_imx, 0);
i2c_imx->stopped = 1;
} else {
/*
* For i2c master receiver repeat restart operation like: