Hi Kumar,
I have resent the updated patch.
Regards
Sachin
On Mon, Nov 26, 2012 at 2:21 AM, Kumar Gala <ga...@kernel.crashing.org> wrote:
>
> On Oct 30, 2012, at 10:00 PM, sachin surendran wrote:
>
>> In case of collision on i2c bus the controller which lost bus mastership
>> stays as a slave
>> for all subsequent transfers. This results in the i2c controller never
>> writing to the bus
>> for future transactions, resulting in i2c transfer timeouts.
>> This fix checks for a collision on last I2C transaction and sets the
>> I2COM_MASTER
>> bit for the new transaction.
>>
>> Signed-off-by: Sachin Surendran <sachin.surend...@alliedtelesis.co.nz>
>> ---
>> drivers/i2c/busses/i2c-cpm.c | 8 ++++++++
>> 1 file changed, 8 insertions(+)
>
> patch doesn't apply, please resend properly.
>
> - k
>
>>
>> diff --git a/drivers/i2c/busses/i2c-cpm.c b/drivers/i2c/busses/i2c-cpm.c
>> index c1e1096..bb94c6d 100644
>> --- a/drivers/i2c/busses/i2c-cpm.c
>> +++ b/drivers/i2c/busses/i2c-cpm.c
>> @@ -338,6 +338,14 @@ static int cpm_i2c_xfer(struct i2c_adapter *adap,
>> struct i2c_msg *msgs, int num)
>> tptr = 0;
>> rptr = 0;
>>
>> + /*
>> + * If there was a collision in the last i2c transaction,
>> + * Set I2COM_MASTER as it was cleared during collision.
>> + */
>> + if (in_be16(&tbdf->cbd_sc) & BD_SC_CL) {
>> + out_8(&cpm->i2c_reg->i2com, I2COM_MASTER);
>> + }
>> +
>> while (tptr < num) {
>> pmsg = &msgs[tptr];
>> dev_dbg(&adap->dev, "R: %d T: %d\n", rptr, tptr);
>>
>> _______________________________________________
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>> Linuxppc-dev@lists.ozlabs.org
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>
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